CCNA 3 v7.0 Final Exam Answers – Enterprise Networking, Security, and Automation

Course Final Exam for Enterprise Networking, Security, and Automation (ENSA v7.0). This comprehensive study guide covers all modules of CCNA 3 v7.0, including OSPF, network security, WAN concepts, QoS, and network automation.

1. Which design feature will limit the size of a failure domain in an enterprise network?

  • A. the purchase of enterprise equipment that is designed for large traffic volume
  • B. the installation of redundant power supplies
  • C. the use of a collapsed core design
  • D. the use of the building switch block approach

Explanation: In order to best limit the of a failure domain, routers or multilayer switches can be deployed in pairs. The failure of a single device should not cause the network to go down. Installing redundant power supplies may protect a single device from a power failure, but if that device suffers from another type of problem, a redundant device would have been a better solution. Purchasing enterprise equipment that handles large flows of traffic will not provide extra reliability in times of an outage. If a collapsed core design is used, the core and distribution are collapsed into a single device, increasing the chance of a devastating outage.

2. Which two things should a network administrator modify on a router to perform password recovery? (Choose two.)

  • A. the system image file
  • B. the NVRAM file system
  • C. the configuration register value
  • D. the startup configuration file
  • E. system ROM

Explanation: Password recovery requires modifying the configuration register to bypass the startup configuration and then resetting the password.

3. What type of network uses one common infrastructure to carry voice, data, and video signals?

  • A. borderless
  • B. converged
  • C. managed
  • D. switched

Explanation: A converged network has only one physical network to install and manage. This results in substantial savings over the installation and management of separate voice, video, and data networks.

4. What are three advantages of using private IP addresses and NAT? (Choose three.)

  • A. hides private LAN addressing from outside devices that are connected to the Internet
  • B. permits LAN expansion without additional public IP addresses
  • C. reduces CPU usage on customer routers
  • D. creates multiple public IP addresses
  • E. improves the performance of the router that is connected to the Internet
  • F. conserves registered public IP addresses

Explanation: Private IP addresses are designed to be exclusively used for internal networks and they cannot be used on the Internet. Thus they are not visible directly from the Internet and they can be used freely by network administrators for internal networks. In order for the internal hosts to access the Internet, NAT is used to translate between private and public IP addresses. NAT takes an internal private IP address and translates it to a global public IP address before the packet is forwarded.

5. Which two scenarios are examples of remote access VPNs? (Choose two.)

  • A. All users at a large branch office can access company resources through a single VPN connection.
  • B. A small branch office with three employees has a Cisco ASA that is used to create a VPN connection to the HQ.
  • C. A toy manufacturer has a permanent VPN connection to one of its parts suppliers.
  • D. A mobile sales agent is connecting to the company network via the Internet connection at a hotel.
  • E. An employee who is working from home uses VPN client software on a laptop in order to connect to the company network.

Explanation: Remote access VPNs connect individual users to another network via a VPN client that is installed on the user device. Site-to-site VPNs are “always on” connections that use VPN gateways to connect two sites together. Users at each site can access the network on the other site without having to use any special clients or configurations on their individual devices.

6. What are three benefits of cloud computing? (Choose three.)

  • A. It utilizes end-user clients to do a substantial amount of data preprocessing and storage.
  • B. It uses open-source software for distributed processing of large datasets.
  • C. It streamlines the IT operations of an organization by subscribing only to needed services.
  • D. It enables access to organizational data anywhere and at any time.
  • E. It turns raw data into meaningful information by discovering patterns and relationships.
  • F. It eliminates or reduces the need for onsite IT equipment, maintenance, and management.

Explanation: Cloud computing provides on-demand services, reduces onsite equipment needs, and enables access from anywhere.

7. What is a characteristic of a single-area OSPF network?

  • A. All routers share a common forwarding database.
  • B. All routers have the same neighbor table.
  • C. All routers are in the backbone area.
  • D. All routers have the same routing table.

Explanation: In a single-area OSPF network, all routers are in the backbone area (area 0).

8. What is a WAN?

  • A. a network infrastructure that spans a limited physical area such as a city
  • B. a network infrastructure that provides access to other networks over a large geographic area
  • C. a network infrastructure that provides access in a small geographic area
  • D. a network infrastructure designed to provide data storage, retrieval, and replication

Explanation: A WAN (Wide Area Network) spans a large geographic area and connects multiple LANs.

9. A network administrator has been tasked with creating a disaster recovery plan. As part of this plan, the administrator is looking for a backup site for all of the data on the company servers. What service or technology would support this requirement?

  • A. data center
  • B. virtualization
  • C. dedicated servers
  • D. software defined networking

Explanation: A data center provides the infrastructure for backup and disaster recovery.

10. Which type of OSPF packet is used by a router to discover neighbor routers and establish neighbor adjacency?

  • A. link-state update
  • B. hello
  • C. database description
  • D. link-state request

Explanation: Hello packets are used to discover and maintain neighbor relationships in OSPF.

11. Which two statements are characteristics of a virus? (Choose two.)

  • A. A virus has an enabling vulnerability, a propagation mechanism, and a payload.
  • B. A virus can be dormant and then activate at a specific time or date.
  • C. A virus provides the attacker with sensitive data, such as passwords.
  • D. A virus replicates itself by independently exploiting vulnerabilities in networks.
  • E. A virus typically requires end-user activation.

Explanation: The type of end user interaction required to launch a virus is typically opening an application, opening a web page, or powering on the computer. Once activated, a virus may infect other files located on the computer or other computers on the same network.

12. Which public WAN access technology utilizes copper telephone lines to provide access to subscribers that are multiplexed into a single T3 link connection?

  • A. ISDN
  • B. DSL
  • C. cable
  • D. dialup

Explanation: DSL uses copper telephone lines and can be multiplexed into T3 connections.

13. A customer needs a metropolitan area WAN connection that provides high-speed, dedicated bandwidth between two sites. Which type of WAN connection would best fulfill this need?

  • A. packet-switched network
  • B. Ethernet WAN
  • C. circuit-switched network
  • D. MPLS

Explanation: MPLS can use a variety of underlying technologies such as T- and E-Carriers, Carrier Ethernet, ATM, Frame Relay, and DSL, all of which support lower speeds than an Ethernet WAN. Neither a circuit-switched network, such as the public switched telephone network (PSTN) or Integrated Service Digital Network (ISDN), nor a packet-switched network, is considered high speed.

14. A company has contracted with a network security firm to help identify the vulnerabilities of the corporate network. The firm sends a team to perform penetration tests to the company network. Why would the team use debuggers?

  • A. to detect installed tools within files and directories that provide threat actors remote access and control over a computer or network
  • B. to reverse engineer binary files when writing exploits and when analyzing malware
  • C. to obtain specially designed operating systems preloaded with tools optimized for hacking
  • D. to detect any evidence of a hack or malware in a computer or network

Explanation: Debuggers are used to reverse engineer binaries and analyze malware during penetration testing.

15. Consider the following output for an ACL that has been applied to a router via the access-class in command. What can a network administrator determine from the output that is shown?

R1#
Standard IP access list 2
10 permit 192.168.10.0, wildcard bits 0.0.0.255 (2 matches)
20 deny any (1 match)
  • A. Two devices connected to the router have IP addresses of 192.168.10.x.
  • B. Two devices were able to use SSH or Telnet to gain access to the router.
  • C. Traffic from one device was not allowed to come into one router port and be routed outbound a different router port.
  • D. Traffic from two devices was allowed to enter one router port and be routed outbound to a different router port.

Explanation: The access-class command is used only on VTY ports. VTY ports support Telnet and/or SSH traffic. The match permit ACE is how many attempts were allowed using the VTY ports. The match deny ACE shows that a device from a network other than 192.168.10.0 was not allowed to access the router through the VTY ports.

16. What command would be used as part of configuring NAT or PAT to clear dynamic entries before the timeout has expired?

  • A. clear ip dhcp
  • B. clear ip nat translation
  • C. clear access-list counters
  • D. clear ip pat statistics

Explanation: The clear ip nat translation command clears dynamic NAT entries.

17. What are two characteristics of video traffic? (Choose two.)

  • A. Video traffic consumes less network resources than voice traffic consumes.
  • B. Video traffic latency should not exceed 400 ms.
  • C. Video traffic is more resilient to loss than voice traffic is.
  • D. Video traffic requires a minimum of 30 kbs of bandwidth.
  • E. Video traffic is unpredictable and inconsistent.

Explanation: Video traffic is bursty and requires low latency; acceptable latency is up to 400 ms.

18. Refer to the exhibit. A technician is configuring R2 for static NAT to allow the client to access the web server. What is a possible reason that the client PC cannot access the web server?

Static NAT topology
  • A. The IP NAT statement is incorrect.
  • B. Interface Fa0/1 should be identified as the outside NAT interface.
  • C. Interface S0/0/0 should be identified as the outside NAT interface.
  • D. The configuration is missing a valid access control list.

Explanation: Interface S0/0/0 should be identified as the outside NAT interface. The command to do this would be R2(config-if)# ip nat outside.

19. In setting up a small office network, the network administrator decides to assign private IP addresses dynamically to workstations and mobile devices. Which feature must be enabled on the company router in order for office devices to access the internet?

  • A. UPnP
  • B. MAC filtering
  • C. NAT
  • D. QoS

Explanation: Network Address Translation (NAT) is the process used to convert private addresses to internet-routable addresses that allow office devices to access the internet.

20. A data center has recently updated a physical server to host multiple operating systems on a single CPU. The data center can now provide each customer with a separate web server without having to allocate an actual discrete server for each customer. What is the networking trend that is being implemented by the data center in this situation?

  • A. online collaboration
  • B. BYOD
  • C. virtualization
  • D. maintaining communication integrity

Explanation: Virtualization allows multiple operating systems to run on a single physical server.

21. Refer to the exhibit. Which address or addresses represent the inside global address?

NAT addresses
  • A. 192.168.0.100
  • B. 10.1.1.2
  • C. any address in the 10.1.1.0 network
  • D. 209.165.20.25

Explanation: The inside global address is the public address used for NAT translation (209.165.20.25).

22. Which two IPsec protocols are used to provide data integrity?

  • A. MD5
  • B. DH
  • C. AES
  • D. SHA
  • E. RSA

Explanation: The IPsec framework uses various protocols and algorithms to provide data confidentiality, data integrity, authentication, and secure key exchange. Two popular algorithms used to ensure that data is not intercepted and modified (data integrity) are MD5 and SHA. AES is an encryption protocol and provides data confidentiality. DH (Diffie-Hellman) is an algorithm used for key exchange. RSA is an algorithm used for authentication.

23. If an outside host does not have the Cisco AnyConnect client preinstalled, how would the host gain access to the client image?

  • A. The Cisco AnyConnect client is installed by default on most major operating systems.
  • B. The host initiates a clientless VPN connection using a compliant web browser to download the client.
  • C. The host initiates a clientless connection to a TFTP server to download the client.
  • D. The host initiates a clientless connection to an FTP server to download the client.

Explanation: If an outside host does not have the Cisco AnyConnect client preinstalled, the remote user must initiate a clientless SSL VPN connection via a compliant web browser, and then download and install the AnyConnect client on the remote host.

24. A company is considering updating the campus WAN connection. Which two WAN options are examples of the private WAN architecture? (Choose two.)

  • A. leased line
  • B. cable
  • C. digital subscriber line
  • D. Ethernet WAN
  • E. municipal Wi-Fi

Explanation: Leased lines and Ethernet WAN are examples of private WAN infrastructure.

25. Which type of QoS marking is applied to Ethernet frames?

  • A. IP precedence
  • B. DSCP
  • C. ToS
  • D. CoS

Explanation: The class of service (CoS) marking allows a Layer 2 Ethernet frame to be marked with eight levels of priority (values 0–7). This marking can be used by QoS-enabled network devices to provide preferential traffic treatment.

26. Refer to the exhibit. Routers R1 and R2 are connected via a serial link. One router is configured as the NTP master, and the other is an NTP client. Which two pieces of information can be obtained from the partial output of the show ntp associations detail command on R2? (Choose two.)

NTP output
  • A. Both routers are configured to use NTPv2.
  • B. Router R1 is the master, and R2 is the client
  • C. The IP address of R2 is 192.168.1.2.
  • D. Router R2 is the master, and R1 is the client
  • E. The IP address of R1 is 192.168.1.2

Explanation: The NTP association output shows the master (R1) and client (R2) relationship.

27. Refer to the exhibit. The network administrator that has the IP address of 10.0.70.23/25 needs to have access to the corporate FTP server (10.0.54.5/28). The FTP server is also a web server that is accessible to all internal employees on networks within the 10.x.x.x address. No other traffic should be allowed to this server. Which extended ACL would be used to filter this traffic, and how would this ACL be applied? (Choose two.)

ACL topology
  • A. R1(config)# interface s0/0/0
    R1(config-if)# ip access-group 105 out
  • B. R2(config)# interface gi0/0
    R2(config-if)# ip access-group 105 in
  • C. access-list 105 permit tcp host 10.0.70.23 host 10.0.54.5 eq 20
    access-list 105 permit tcp host 10.0.70.23 host 10.0.54.5 eq 21
    access-list 105 permit tcp 10.0.0.0 0.255.255.255 host 10.0.54.5 eq www
    access-list 105 deny ip any host 10.0.54.5
    access-list 105 permit ip any any
  • D. access-list 105 permit ip host 10.0.70.23 host 10.0.54.5
    access-list 105 permit tcp any host 10.0.54.5 eq www
    access-list 105 permit ip any any
  • E. R1(config)# interface gi0/0
    R1(config-if)# ip access-group 105 out
  • F. access-list 105 permit tcp host 10.0.54.5 any eq www
    access-list 105 permit tcp host 10.0.70.23 host 10.0.54.5 eq 20
    access-list 105 permit tcp host 10.0.70.23 host 10.0.54.5 eq 21

Explanation: The first two lines of the ACL allow host 10.0.70.23 FTP access to the server that has the IP address of 10.0.54.5. The next line of the ACL allows HTTP access to the server from any host that has an IP address that starts with the number 10. The fourth line of the ACL denies any other type of traffic to the server from any source IP address. The last line of the ACL permits anything else in case there are other servers or devices added to the 10.0.54.0/28 network. Because traffic is being filtered from all other locations and for the 10.0.70.23 host device, the best place to put this ACL is closest to the server.

28. Refer to the exhibit. If the network administrator created a standard ACL that allows only devices that connect to the R2 G0/0 network access to the devices on the R1 G0/1 interface, how should the ACL be applied?

ACL placement
  • A. inbound on the R2 G0/0 interface
  • B. outbound on the R1 G0/1 interface
  • C. inbound on the R1 G0/1 interface
  • D. outbound on the R2 S0/0/1 interface

Explanation: Because standard access lists only filter on the source IP address, they are commonly placed closest to the destination network. In this example, the source packets will be coming from the R2 G0/0 network. The destination is the R1 G0/1 network. The proper ACL placement is outbound on the R1 G0/1 interface.

29. Which is a characteristic of a Type 2 hypervisor?

  • A. does not require management console software
  • B. has direct access to server hardware resources
  • C. best suited for enterprise environments
  • D. installs directly on hardware

Explanation: Type 2 hypervisors are hosted on an underlaying operating system and are best suited for consumer applications and those experimenting with virtualization. Unlike Type 1 hypervisors, Type 2 hypervisors do not require a management console and do not have direct access to hardware.​

30. What are the two types of VPN connections? (Choose two.)

  • A. PPPoE
  • B. Frame Relay
  • C. site-to-site
  • D. remote access
  • E. leased line

Explanation: The two main types of VPNs are site-to-site and remote access.

31. Refer to the exhibit. What three conclusions can be drawn from the displayed output? (Choose three.)

OSPF output
  • A. The DR can be reached through the GigabitEthernet 0/0 interface.
  • B. There have been 9 seconds since the last hello packet sent.
  • C. This interface is using the default priority.
  • D. The router ID values were not the criteria used to select the DR and the BDR.
  • E. The router ID on the DR router is 3.3.3.3
  • F. The BDR has three neighbors.

Explanation: The OSPF output shows DR/BDR election details and hello timer information.

32. Refer to the exhibit. A network administrator is configuring an ACL to limit the connection to R1 vty lines to only the IT group workstations in the network 192.168.22.0/28. The administrator verifies the successful Telnet connections from a workstation with IP 192.168.22.5 to R1 before the ACL is applied. However, after the ACL is applied to the interface Fa0/0, Telnet connections are denied. What is the cause of the connection failure?

ACL failure
  • A. The enable secret password is not configured on R1.
  • B. The IT group network is included in the deny statement.
  • C. The permit ACE specifies a wrong port number.
  • D. The permit ACE should specify protocol ip instead of tcp.
  • E. The login command has not been entered for vty lines.

Explanation: The source IP range in the deny ACE is 192.168.20.0 0.0.3.255, which covers IP addresses from 192.168.20.0 to 192.168.23.255. The IT group network 192.168.22.0/28 is included in the 192.168.20/22 network. Therefore, the connection is denied. To fix it, the order of the deny and permit ACE should be switched.

33. What functionality does mGRE provide to the DMVPN technology?

  • A. It allows the creation of dynamically allocated tunnels through a permanent tunnel source at the hub and dynamically allocated tunnel destinations at the spokes.
  • B. It provides secure transport of private information over public networks, such as the Internet.
  • C. It is a Cisco software solution for building multiple VPNs in an easy, dynamic, and scalable manner.
  • D. It creates a distributed mapping database of public IP addresses for all VPN tunnel spokes.

Explanation: DMVPN is built on three protocols, NHRP, IPsec, and mGRE. NHRP is the distributed address mapping protocol for VPN tunnels. IPsec encrypts communications on VPN tunnels. The mGRE protocol allows the dynamic creation of multiple spoke tunnels from one permanent VPN hub.

34. What is used to pre-populate the adjacency table on Cisco devices that use CEF to process packets?

  • A. the FIB
  • B. the routing table
  • C. the ARP table
  • D. the DSP

Explanation: CEF uses the ARP table to pre-populate the adjacency table for fast forwarding.

35. What command would be used as part of configuring NAT or PAT to display information about NAT configuration parameters and the number of addresses in the pool?

  • A. show running-config
  • B. show ip nat statistics
  • C. show ip cache
  • D. show version

Explanation: show ip nat statistics displays NAT configuration and pool information.

36. What is a purpose of establishing a network baseline?

  • A. It provides a statistical average for network performance.
  • B. It creates a point of reference for future network evaluations.
  • C. It manages the performance of network devices.
  • D. It checks the security configuration of network devices.

Explanation: A baseline is used to establish normal network or system performance. It can be used to compare with future network or system performances in order to detect abnormal situations.

37. Match the type of WAN device or service to the description. (Not all options are used.)

WAN device matching

Explanation: Topic 7.1 – Match each WAN component to its description.

Device/ServiceDescription
CPEdevices and inside wiring that are located on the enterprise edge and connect to a carrier link
DCEdevices that provide an interface for customers to connect to within the WAN cloud
DTEcustomer devices that pass the data from a customer network for transmission over the WAN
local loopa physical connection from the customer to the service provider POP

38. Which statement describes a characteristic of standard IPv4 ACLs?

  • A. They filter traffic based on source IP addresses only.
  • B. They can be created with a number but not with a name.
  • C. They are configured in the interface configuration mode.
  • D. They can be configured to filter traffic based on both source IP addresses and source ports.

Explanation: A baseline is used to establish normal network or system performance. It can be used to compare with future network or system performances in order to detect abnormal situations.

39. Refer to the exhibit. R1 is configured for NAT as displayed. What is wrong with the configuration?

NAT config
  • A. NAT-POOL2 is not bound to ACL 1.
  • B. Interface Fa0/0 should be identified as an outside NAT interface.
  • C. The NAT pool is incorrect.
  • D. Access-list 1 is misconfigured.

Explanation: R1 has to have NAT-POOL2 bound to ACL 1. This is accomplished with the command R1(config)#ip nat inside source list 1 pool NAT-POOL2. This would enable the router to check for all interesting traffic and if it matches ACL 1 it would be translated by use of the addresses in NAT-POOL2.

40. Refer to the exhibit. What method can be used to enable an OSPF router to advertise a default route to neighboring OSPF routers?

OSPF default route
  • A. Use a static route pointing to the ISP and redistribute it.
  • B. Use the redistribute static command on R0-A.
  • C. Use the default-information originate command on ISP.
  • D. Use the default-information originate command on R0-A.

Explanation: The default-information originate command advertises a default route in OSPF.

41. A company has contracted with a network security firm to help identify the vulnerabilities of the corporate network. The firm sends a team to perform penetration tests to the company network. Why would the team use applications such as John the Ripper, THC Hydra, RainbowCrack, and Medusa?

  • A. to capture and analyze packets within traditional Ethernet LANs or WLANs
  • B. to probe and test the robustness of a firewall by using specially created forged packets
  • C. to make repeated guesses in order to crack a password

Explanation: These tools are used for password cracking in penetration testing.

42. What are two syntax rules for writing a JSON array? (Choose two.)

  • A. Each value in the array is separated by a comma.
  • B. The array can include only one value type.
  • C. A space must separate each value in the array.
  • D. A semicolon separates the key and list of values.
  • E. Values are enclosed in square brackets.

Explanation: A JSON array is a collection of ordered values within square brackets [ ]. The values in the array are separated by a comma. For example “users” : [“bob”, “alice”, “eve”].

43. What is a characteristic of a Trojan horse as it relates to network security?

  • A. An electronic dictionary is used to obtain a password to be used to infiltrate a key network device.
  • B. Malware is contained in a seemingly legitimate executable program.
  • C. Extreme quantities of data are sent to a particular network device interface.
  • D. Too much information is destined for a particular memory block, causing additional memory areas to be affected

Explanation: A Trojan horse carries out malicious operations under the guise of a legitimate program. Denial of service attacks send extreme quantities of data to a particular host or network device interface. Password attacks use electronic dictionaries in an attempt to learn passwords. Buffer overflow attacks exploit memory buffers by sending too much information to a host to render the system inoperable.

44. An attacker is redirecting traffic to a false default gateway in an attempt to intercept the data traffic of a switched network. What type of attack could achieve this?

  • A. TCP SYN flood
  • B. DNS tunneling
  • C. DHCP spoofing
  • D. ARP cache poisoning

Explanation: In DHCP spoofing attacks, an attacker configures a fake DHCP server on the network to issue DHCP addresses to clients with the aim of forcing the clients to use a false default gateway, and other false services. DHCP snooping is a Cisco switch feature that can mitigate DHCP attacks. MAC address starvation and MAC address snooping are not recognized security attacks. MAC address spoofing is a network security threat.

45. A company is developing a security policy for secure communication. In the exchange of critical messages between a headquarters office and a branch office, a hash value should only be recalculated with a predetermined code, thus ensuring the validity of data source. Which aspect of secure communications is addressed?

  • A. data integrity
  • B. non-repudiation
  • C. origin authentication
  • D. data confidentiality

Explanation: Secure communications consists of four elements: Data confidentiality – guarantees that only authorized users can read the message Data integrity – guarantees that the message was not altered Origin authentication – guarantees that the message is not a forgery and does actually come from whom it states Data nonrepudiation – guarantees that the sender cannot repudiate, or refute, the validity of a message sent

46. A company has contracted with a network security firm to help identify the vulnerabilities of the corporate network. The firm sends a team to perform penetration tests to the company network. Why would the team use packet sniffers?

  • A. to detect installed tools within files and directories that provide threat actors remote access and control over a computer or network
  • B. to detect any evidence of a hack or malware in a computer or network
  • C. to probe and test the robustness of a firewall by using specially created forged packets
  • D. to capture and analyze packets within traditional Ethernet LANs or WLANs

Explanation: Packet sniffers capture and analyze network traffic.

47. An administrator is configuring single-area OSPF on a router. One of the networks that must be advertised is 172.20.0.0 255.255.252.0. What wildcard mask would the administrator use in the OSPF network statement?

  • A. 0.0.15.255
  • B. 0.0.3.255
  • C. 0.0.7.255
  • D. 0.0.1.255

Explanation: The wildcard mask for 255.255.252.0 is 0.0.3.255.

48. Match the HTTP method with the RESTful operation.

HTTP methods

Explanation: RESTful operations map to HTTP methods.

HTTP MethodRESTful Operation
POSTCreate
GETRead
PUT/PATCHUpdate/Replace/Modify
DELETEDelete

49. Refer to the exhibit. What is the OSPF cost to reach the West LAN 172.16.2.0/24 from East?

OSPF cost
  • A. 782
  • B. 74
  • C. 128
  • D. 65

Explanation: The OSPF cost is calculated based on interface bandwidth; the total cost is 65.

50. What is one reason to use the ip ospf priority command when the OSPF routing protocol is in use?

  • A. to activate the OSPF neighboring process
  • B. to influence the DR/BDR election process
  • C. to provide a backdoor for connectivity during the convergence process
  • D. to streamline and speed up the convergence process

Explanation: The OSPF priority can be set to a number between 0 and 255. The higher the number set, the more likely the router becomes the DR. A priority 0 stops a router from participating in the election process and the router does not become a DR or a BDR.

51. An ACL is applied inbound on a router interface. The ACL consists of a single entry:
access-list 210 permit tcp 172.18.20.0 0.0.0.31 172.18.20.32 0.0.0.31 eq ftp .
If a packet with a source address of 172.18.20.14, a destination address of 172.18.20.40, and a protocol of 21 is received on the interface, is the packet permitted or denied?

  • A. permitted
  • B. Denied

Explanation: The source (172.18.20.14) and destination (172.18.20.40) match the ACL, and port 21 is FTP, so it is permitted.

52. What is a characteristic of the two-tier spine-leaf topology of the Cisco ACI fabric architecture?

  • A. The spine and leaf switches are always linked through core switches.
  • B. The spine switches attach to the leaf switches and attach to each other for redundancy.
  • C. The leaf switches always attach to the spines and they are interlinked through a trunk line.
  • D. The leaf switches always attach to the spines, but they never attach to each other.

Explanation: In spine-leaf topology, leaf switches connect to spines but not to each other.

53. Which two scenarios would result in a duplex mismatch? (Choose two.)

  • A. connecting a device with autonegotiation to another that is manually set to full-duplex
  • B. starting and stopping a router interface during a normal operation
  • C. connecting a device with an interface running at 100 Mbps to another with an interface running at 1000 Mbps
  • D. configuring dynamic routing incorrectly
  • E. manually setting the two connected devices to different duplex modes

Explanation: Duplex mismatch occurs when one side is set to full-duplex and the other to half-duplex, or when autonegotiation fails.

54. A network technician is configuring SNMPv3 and has set a security level of auth. What is the effect of this setting?

  • A. authenticates a packet by a string match of the username or community string
  • B. authenticates a packet by using either the HMAC with MD5 method or the SHA method
  • C. authenticates a packet by using either the HMAC MD5 or HMAC SHA algorithms and encrypts the packet with either the DES, 3DES or AES algorithms
  • D. authenticates a packet by using the SHA algorithm only

Explanation: SNMPv3 auth level uses HMAC-MD5 or HMAC-SHA for authentication.

55. What are two types of attacks used on DNS open resolvers? (Choose two.)

  • A. amplification and reflection
  • B. resource utilization
  • C. fast flux
  • D. ARP poisoning
  • E. cushioning

Explanation: Three types of attacks used on DNS open resolvers are as follows:DNS cache poisoning – attacker sends spoofed falsified information to redirect users from legitimate sites to malicious sites DNS amplification and reflection attacks – attacker sends an increased volume of attacks to mask the true source of the attack DNS resource utilization attacks – a denial of service (DoS) attack that consumes server resources

56. An ACL is applied inbound on a router interface. The ACL consists of a single entry:
access-list 101 permit udp 192.168.100.0 0.0.2.255 64.100.40.0 0.0.0.15 eq telnet .
If a packet with a source address of 192.168.101.45, a destination address of 64.100.40.4, and a protocol of 23 is received on the interface, is the packet permitted or denied?

  • A. denied
  • B. permitted

Explanation: The ACL specifies UDP, but Telnet uses TCP (port 23), so the packet is denied.

57. Which type of resources are required for a Type 1 hypervisor?

  • A. a dedicated VLAN
  • B. a management console
  • C. a host operating system
  • D. a server running VMware Fusion

Explanation: Type 1 hypervisors require a management console for administration.

58. In JSON, what is held within square brackets [ ]?

  • A. nested values
  • B. key/value pairs
  • C. an object
  • D. an array

Explanation: Square brackets in JSON denote an array.

59. What are three components used in the query portion of a typical RESTful API request? (Choose three.)

  • A. resources
  • B. protocol
  • C. API server
  • D. format
  • E. key
  • F. parameters

Explanation: RESTful API queries include format, key, and parameters.

60. A user reports that when the corporate web page URL is entered on a web browser, an error message indicates that the page cannot be displayed. The help-desk technician asks the user to enter the IP address of the web server to see if the page can be displayed. Which troubleshooting method is being used by the technician?

  • A. top-down
  • B. bottom-up
  • C. divide-and-conquer
  • D. substitution

Explanation: The technician is using divide-and-conquer by testing IP connectivity to isolate the issue.

61. Which protocol provides authentication, integrity, and confidentiality services and is a type of VPN?

  • A. MD5
  • B. AES
  • C. IPsec
  • D. ESP

Explanation: IPsec services allow for authentication, integrity, access control, and confidentiality. With IPsec, the information exchanged between remote sites can be encrypted and verified. Both remote-access and site-to-site VPNs can be deployed using IPsec.

62. Which statement describes a characteristic of Cisco Catalyst 2960 switches?

  • A. They are best used as distribution layer switches.
  • B. New Cisco Catalyst 2960-C switches support PoE pass-through.
  • C. They are modular switches.
  • D. They do not support an active switched virtual interface (SVI) with IOS versions prior to 15.x.

Explanation: Cisco Catalyst 2960 switches support one active switched virtual interface (SVI) with IOS versions prior to 15.x. They are commonly used as access layer switches and they are fixed configuration switches.

63. Which component of the ACI architecture translates application policies into network programming?

  • A. the hypervisor
  • B. the Application Policy Infrastructure Controller
  • C. the Nexus 9000 switch
  • D. the Application Network Profile endpoints

Explanation: The APIC translates application policies into network programming in ACI.

64. Which two pieces of information should be included in a logical topology diagram of a network? (Choose two.)

  • A. device type
  • B. cable specification
  • C. interface identifier
  • D. OS/IOS version
  • E. connection type
  • F. cable type and identifier

Explanation: The interface identifier and connection type should be included in a logical topology diagram because they indicate which interface is connected to other devices in the network with a specific type such as LAN, WAN, point-to-point, etc. The OS/IOS version, device type, cable type and identifier, and cable specification are typically included in a physical topology diagram.

65. Refer to the exhibit. A PC at address 10.1.1.45 is unable to access the Internet. What is the most likely cause of the problem?

NAT problem
  • A. The NAT pool has been exhausted.
  • B. The wrong netmask was used on the NAT pool.
  • C. Access-list 1 has not been configured properly.
  • D. The inside and outside interfaces have been configured backwards.

Explanation: The output of show ip nat statistics shows that there are 2 total addresses and that 2 addresses have been allocated (100%). This indicates that the NAT pool is out of global addresses to give new clients. Based on the show ip nat translations, PCs at 10.1.1.33 and 10.1.1.123 have used the two available addresses to send ICMP messages to a host on the outside network.

66. What are two benefits of using SNMP traps? (Choose two.)

  • A. They eliminate the need for some periodic polling requests.
  • B. They reduce the load on network and agent resources.
  • C. They limit access for management systems only.
  • D. They can provide statistics on TCP/IP packets that flow through Cisco devices.
  • E. They can passively listen for exported NetFlow datagrams.

Explanation: SNMP traps reduce polling and network load by sending notifications only when events occur.

67. Which statement accurately describes a characteristic of IPsec?

  • A. IPsec works at the application layer and protects all application data.
  • B. IPsec is a framework of standards developed by Cisco that relies on OSI algorithms.
  • C. IPsec is a framework of proprietary standards that depend on Cisco specific algorithms.
  • D. IPsec works at the transport layer and protects data at the network layer.
  • E. IPsec is a framework of open standards that relies on existing algorithms.

Explanation: IPsec is an open standards framework that provides security at the network layer.

68. In a large enterprise network, which two functions are performed by routers at the distribution layer? (Choose two.)

  • A. connect users to the network
  • B. provide a high-speed network backbone
  • C. connect remote networks
  • D. provide Power over Ethernet to devices
  • E. provide data traffic security

Explanation: In a large enterprise network, the provision of a high-speed network backbone is a function of the core layer. Access layer switches connect users to the network and provide Power over Ethernet to devices. Distribution layer routers provide data traffic security and connections to other networks.

69. Which two statements describe the use of asymmetric algorithms? (Choose two.)

  • A. Public and private keys may be used interchangeably.
  • B. If a public key is used to encrypt the data, a public key must be used to decrypt the data.
  • C. If a private key is used to encrypt the data, a public key must be used to decrypt the data.
  • D. If a public key is used to encrypt the data, a private key must be used to decrypt the data.
  • E. If a private key is used to encrypt the data, a private key must be used to decrypt the data.

Explanation: Asymmetric algorithms use two keys: a public key and a private key. Both keys are capable of the encryption process, but the complementary matched key is required for decryption. If a public key encrypts the data, the matching private key decrypts the data. The opposite is also true. If a private key encrypts the data, the corresponding public key decrypts the data.

70. Refer to the exhibit. A network administrator has deployed QoS and has configured the network to mark traffic on the VoIP phones as well as the Layer 2 and Layer 3 switches. Where should initial marking occur to establish the trust boundary?

QoS trust boundary
  • A. Trust Boundary 4
  • B. Trust Boundary 3
  • C. Trust Boundary 1
  • D. Trust Boundary 2

Explanation: Traffic should be classified and marked as close to its source as possible. The trust boundary identifies at which device marked traffic should be trusted. Traffic marked on VoIP phones would be considered trusted as it moves into the enterprise network.

71. What are two benefits of extending access layer connectivity to users through a wireless medium? (Choose two.)

  • A. reduced costs
  • B. decreased number of critical points of failure
  • C. increased flexibility
  • D. increased bandwidth availability
  • E. increased network management options

Explanation: Wireless connectivity at the access layer provides increased flexibility, reduced costs, and the ability to grow and adapt to changing business requirements. Utilizing wireless routers and access points can provide an increase in the number of central points of failure. Wireless routers and access points will not provide an increase in bandwidth availability.

72. What are two purposes of launching a reconnaissance attack on a network? (Choose two.)

  • A. to scan for accessibility
  • B. to retrieve and modify data
  • C. to gather information about the network and devices
  • D. to prevent other users from accessing the system
  • E. to escalate access privileges

Explanation: Gathering information about a network and scanning for access is a reconnaissance attack. Preventing other users from accessing a system is a denial of service attack. Attempting to retrieve and modify data, and attempting to escalate access privileges are types of access attacks.

73. A group of users on the same network are all complaining about their computers running slowly. After investigating, the technician determines that these computers are part of a zombie network. Which type of malware is used to control these computers?

  • A. botnet
  • B. spyware
  • C. virus
  • D. rootkit

Explanation: A botnet is a network of infected computers controlled by an attacker.

74. An ACL is applied inbound on a router interface. The ACL consists of a single entry:
access-list 101 permit tcp 10.1.1.0 0.0.0.255 host 192.31.7.45 eq dns .
If a packet with a source address of 10.1.1.201, a destination address of 192.31.7.45, and a protocol of 23 is received on the interface, is the packet permitted or denied?

  • A. permitted
  • B. denied

Explanation: The ACL permits TCP on port 53 (DNS), but the packet uses protocol 23 (Telnet), so it is denied.

75. Refer to the exhibit. From which location did this router load the IOS?

IOS boot
  • A. flash memory
  • B. NVRAM
  • C. RAM
  • D. ROM
  • E. a TFTP server

Explanation: The router loaded the IOS from flash memory.

76. Refer to the exhibit. Which data format is used to represent the data for network automation applications?

JSON example
  • A. XML
  • B. YAML
  • C. HTML
  • D. JSON

Explanation: The format shown is JSON (JavaScript Object Notation).

77. What QoS step must occur before packets can be marked?

  • A. classifying
  • B. shaping
  • C. queuing
  • D. policing

Explanation: Classification must occur before marking to identify which packets to mark.

78. What is the main function of a hypervisor?

  • A. It is used to create and manage multiple VM instances on a host machine.
  • B. It is a device that filters and checks security credentials.
  • C. It is a device that synchronizes a group of sensors.
  • D. It is software used to coordinate and prepare data for analysis.
  • E. It is used by ISPs to monitor cloud computing resources.

Explanation: A hypervisor is a key component of virtualization. A hypervisor is often software-based and is used to create and manage multiple VM instances.

79. A company needs to interconnect several branch offices across a metropolitan area. The network engineer is seeking a solution that provides high-speed converged traffic, including voice, video, and data on the same network infrastructure. The company also wants easy integration to their existing LAN infrastructure in their office locations. Which technology should be recommended?

  • A. Frame Relay
  • B. Ethernet WAN
  • C. VSAT
  • D. ISDN

Explanation: Ethernet WAN uses many Ethernet standards and it connects easily to existing Ethernet LANs. It provides a switched, high-bandwidth Layer 2 network capable of managing data, voice, and video all on the same infrastructure. ISDN, while capable of supporting both voice and data, does not provide high bandwidth. VSAT uses satellite connectivity to establish a private WAN connection but with relatively low bandwidth. Use of VSAT, ISDN, and Frame Relay require specific network devices for the WAN connection and data conversion between LAN and WAN.

80. Refer to the exhibit. As traffic is forwarded out an egress interface with QoS treatment, which congestion avoidance technique is used?

Traffic policing
  • A. traffic shaping
  • B. weighted random early detection
  • C. classification and marking
  • D. traffic policing

Explanation: Traffic shaping buffers excess packets in a queue and then forwards the traffic over increments of time, which creates a smoothed packet output rate. Traffic policing drops traffic when the amount of traffic reaches a configured maximum rate, which creates an output rate that appears as a saw-tooth with crests and troughs.

81. An ACL is applied inbound on a router interface. The ACL consists of a single entry:
access-list 101 permit tcp 10.1.1.0 0.0.0.255 host 10.1.3.8 eq dns .
If a packet with a source address of 10.1.3.8, a destination address of 10.10.3.8, and a protocol of 53 is received on the interface, is the packet permitted or denied?

  • A. denied
  • B. permitted

Explanation: The source address is 10.1.3.8, but the ACL permits traffic from 10.1.1.0/24, so it is denied.

82. Refer to the exhibit. What is the purpose of the command marked with an arrow shown in the partial configuration output of a Cisco broadband router?

NAT command
  • A. defines which addresses are allowed into the router
  • B. defines which addresses can be translated
  • C. defines which addresses are assigned to a NAT pool
  • D. defines which addresses are allowed out of the router

Explanation: The ACL defines the addresses that are subject to NAT translation.

83. If a router has two interfaces and is routing both IPv4 and IPv6 traffic, how many ACLs could be created and applied to it?

  • A. 12
  • B. 4
  • C. 8
  • D. 16
  • E. 6

Explanation: In calculating how many ACLs can be configured, use the rule of “three Ps”: one ACL per protocol, per direction, per interface. In this case, 2 interfaces x 2 protocols x 2 directions yields 8 possible ACLs.

84. Refer to the exhibit. An administrator first configured an extended ACL as shown by the output of the show access-lists command. The administrator then edited this access-list by issuing the commands below. Which two conclusions can be drawn from this new configuration? (Choose two.)

ACL editing
Router(config)# ip access-list extended 101
Router(config-ext-nacl)# no 20
Router(config-ext-nacl)# 5 permit tcp any any eq 22
Router(config-ext-nacl)# 20 deny udp any any
  • A. TFTP packets will be permitted.
  • B. Ping packets will be permitted.
  • C. Telnet packets will be permitted.
  • D. SSH packets will be permitted.
  • E. All TCP and UDP packets will be denied.

Explanation: After editing, the ACL permits SSH (port 22) and ICMP (ping), but denies other TCP and UDP.

85. Which troubleshooting approach is more appropriate for a seasoned network administrator rather than a less-experienced network administrator?

  • A. a less-structured approach based on an educated guess
  • B. an approach comparing working and nonworking components to spot significant differences
  • C. a structured approach starting with the physical layer and moving up through the layers of the OSI model until the cause of the problem is identified
  • D. an approach that starts with the end-user applications and moves down through the layers of the OSI model until the cause of the problem has been identified

Explanation: Experienced administrators may use a less-structured approach based on experience and educated guesses.

86. Refer to the exhibit. Many employees are wasting company time accessing social media on their work computers. The company wants to stop this access. What is the best ACL type and placement to use in this situation?

ACL for social media
  • A. extended ACL outbound on R2 WAN interface towards the internet
  • B. standard ACL outbound on R2 WAN interface towards the internet
  • C. standard ACL outbound on R2 S0/0/0
  • D. extended ACLs inbound on R1 G0/0 and G0/1

Explanation: Extended ACLs placed close to the source (inbound on R1 interfaces) can block specific traffic types.

87. Refer to the exhibit. An administrator is trying to configure PAT on R1, but PC-A is unable to access the Internet. The administrator tries to ping a server on the Internet from PC-A and collects the debugs that are shown in the exhibit. Based on this output, what is most likely the cause of the problem?

NAT debug
  • A. The inside and outside NAT interlaces have been configured backwards
  • B. The inside global address is not on the same subnet as the ISP
  • C. The address on Fa0/0 should be 64.100.0.1.
  • D. The NAT source access list matches the wrong address range.

Explanation: The output of debug ip nat shows each packet that is translated by the router. The “s” is the source IP address of the packet and the “d” is the destination. The address after the arrow (“->”) shows the translated address. In this case, the translated address is on the 209.165.201.0 subnet but the ISP facing interface is in the 209.165.200.224/27 subnet. The ISP may drop the incoming packets, or might be unable to route the return packets back to the host because the address is in an unknown subnet.

88. Why is QoS an important issue in a converged network that combines voice, video, and data communications?

  • A. Data communications must be given the first priority.
  • B. Voice and video communications are more sensitive to latency.
  • C. Legacy equipment is unable to transmit voice and video without QoS.
  • D. Data communications are sensitive to jitter.

Explanation: The output of debug ip nat shows each packet that is translated by the router. The “s” is the source IP address of the packet and the “d” is the destination. The address after the arrow (“->”) shows the translated address. In this case, the translated address is on the 209.165.201.0 subnet but the ISP facing interface is in the 209.165.200.224/27 subnet. The ISP may drop the incoming packets, or might be unable to route the return packets back to the host because the address is in an unknown subnet.

89. Which statement describes a VPN?

  • A. VPNs use logical connections to create public networks through the Internet.
  • B. VPNs use open source virtualization software to create the tunnel through the Internet.
  • C. VPNs use dedicated physical connections to transfer data between remote users.
  • D. VPNs use virtual connections to create a private network through a public network.

Explanation: A VPN is a private network that is created over a public network. Instead of using dedicated physical connections, a VPN uses virtual connections routed through a public network between two network devices.

90. In which OSPF state is the DR/BDR election conducted?

  • A. ExStart
  • B. Init
  • C. Two-Way
  • D. Exchange

Explanation: DR/BDR election occurs in the Two-Way state.

91. Two corporations have just completed a merger. The network engineer has been asked to connect the two corporate networks without the expense of leased lines. Which solution would be the most cost effective method of providing a proper and secure connection between the two corporate networks?

  • A. Cisco Secure Mobility Clientless SSL VPN
  • B. Frame Relay
  • C. remote access VPN using IPsec
  • D. Cisco AnyConnect Secure Mobility Client with SSL
  • E. site-to-site VPN

Explanation: The site-to-site VPN is an extension of a classic WAN network that provides a static interconnection of entire networks. Frame Relay would be a better choice than leased lines, but would be more expensive than implementing site-to-site VPNs. The other options refer to remote access VPNs which are better suited for connecting users to the corporate network versus interconnecting two or more networks.

92. What is the final operational state that will form between an OSPF DR and a DROTHER once the routers reach convergence?

  • A. loading
  • B. established
  • C. full
  • D. two-way

Explanation: OSPF neighbors reach the Full state when they are fully adjacent.

93. Refer to the exhibit. If the switch reboots and all routers have to re-establish OSPF adjacencies, which routers will become the new DR and BDR?

OSPF DR election
  • A. Router R3 will become the DR and router R1 will become the BDR.
  • B. Router R4 will become the DR and router R3 will become the BDR.
  • C. Router R1 will become the DR and router R2 will become the BDR.
  • D. Router R3 will become the DR and router R2 will become the BDR.

Explanation: R3 has the highest priority and highest router ID, so it becomes DR; R1 becomes BDR.

94. Which type of server would be used to keep a historical record of messages from monitored network devices?

  • A. DNS
  • B. print
  • C. DHCP
  • D. syslog
  • E. authentication

Explanation: A syslog server stores log messages from network devices.

95. When QoS is implemented in a converged network, which two factors can be controlled to improve network performance for real-time traffic? (Choose two.)

  • A. packet addressing
  • B. delay
  • C. jitter
  • D. packet routing
  • E. link speed

Explanation: Delay is the latency between a sending and receiving device. Jitter is the variation in the delay of the received packets. Both delay and jitter need to be controlled in order to support real-time voice and video traffic.

96. In which step of gathering symptoms does the network engineer determine if the problem is at the core, distribution, or access layer of the network?

  • A. Determine ownership.
  • B. Determine the symptoms.
  • C. Narrow the scope.
  • D. Document the symptoms.
  • E. Gather information.

Explanation: In the “narrow the scope” step of gathering symptoms, a network engineer will determine if the network problem is at the core, distribution, or access layer of the network. Once this step is complete and the layer is identified, the network engineer can determine which pieces of equipment are the most likely cause.

97. What protocol sends periodic advertisements between connected Cisco devices in order to learn device name, IOS version, and the number and type of interfaces?

  • A. CDP
  • B. SNMP
  • C. NTP
  • D. LLDP

Explanation: CDP (Cisco Discovery Protocol) advertises device information to neighbors.

98. An administrator is configuring single-area OSPF on a router. One of the networks that must be advertised is 192.168.0.0 255.255.252.0. What wildcard mask would the administrator use in the OSPF network statement?

  • A. 0.0.0.127
  • B. 0.0.0.31
  • C. 0.0.3.255
  • D. 0.0.0.63

Explanation: The wildcard mask for 255.255.252.0 is 0.0.3.255.

99. Refer to the exhibit. An administrator configures the following ACL in order to prevent devices on the 192.168.1.0 subnet from accessing the server at 10.1.1.5:
access-list 100 deny ip 192.168.1.0 0.0.0.255 host 10.1.1.5 access-list 100 permit ip any any .
Where should the administrator place this ACL for the most efficient use of network resources?

ACL placement
  • A. inbound on router A Fa0/0
  • B. outbound on router B Fa0/0
  • C. outbound on router A Fa0/1
  • D. inbound on router B Fa0/1

Explanation: The ACL should be placed inbound on the interface closest to the source (router A Fa0/0).

100. Which type of OSPFv2 packet is used to forward OSPF link change information?

  • A. link-state acknowledgment
  • B. link-state update
  • C. hello
  • D. database description

Explanation: Link-state update packets carry OSPF link change information.

101. What protocol synchronizes with a private master clock or with a publicly available server on the internet?

  • A. MPLS
  • B. CBWFQ
  • C. TFTP
  • D. NTP

Explanation: NTP (Network Time Protocol) synchronizes time with a master clock.

102. Which type of VPN allows multicast and broadcast traffic over a secure site-to-site VPN?

  • A. dynamic multipoint VPN
  • B. SSL VPN
  • C. IPsec virtual tunnel interface
  • D. GRE over IPsec

Explanation: GRE over IPsec supports multicast and broadcast traffic over a secure VPN.

103. An OSPF router has three directly connected networks; 10.0.0.0/16, 10.1.0.0/16, and 10.2.0.0/16. Which OSPF network command would advertise only the 10.1.0.0 network to neighbors?

  • A. router(config-router)# network 10.1.0.0 0.0.255.255 area 0
  • B. router(config-router)# network 10.1.0.0 0.0.15.255 area 0
  • C. router(config-router)# network 10.1.0.0 255.255.255.0 area 0
  • D. router(config-router)# network 10.1.0.0 0.0.0.0 area 0

Explanation: To advertise only the 10.1.0.0/16 network the wildcard mask used in the network command must match the first 16-bits exactly. To match bits exactly, a wildcard mask uses a binary zero. This means that the first 16-bits of the wildcard mask must be zero. The low order 16-bits can all be set to 1.

104. Refer to the exhibit. Which sequence of commands should be used to configure router A for OSPF?

OSPF config
  • A. router ospf 1
    network 192.168.10.0 area 0
  • B. router ospf 1
    network 192.168.10.0
  • C. router ospf 1
    network 192.168.10.64 255.255.255.192
    network 192.168.10.192 255.255.255.252
  • D. router ospf 1
    network 192.168.10.64 0.0.0.63 area 0
    network 192.168.10.192 0.0.0.3 area 0

Explanation: OSPF network statements use wildcard masks and area numbers.

105. An administrator is configuring single-area OSPF on a router. One of the networks that must be advertised is 192.168.0.0 255.255.254.0. What wildcard mask would the administrator use in the OSPF network statement?

  • A. 0.0.7.255
  • B. 0.0.1.255
  • C. 0.0.3.255
  • D. 0.0.15.255

Explanation: The wildcard mask for 255.255.254.0 is 0.0.1.255.

106. How does virtualization help with disaster recovery within a data center?

  • A. improvement of business practices
  • B. supply of consistent air flow
  • C. support of live migration
  • D. guarantee of power

Explanation: To advertise only the 10.1.0.0/16 network the wildcard mask used in the network command must match the first 16-bits exactly. To match bits exactly, a wildcard mask uses a binary zero. This means that the first 16-bits of the wildcard mask must be zero. The low order 16-bits can all be set to 1.

107. How does virtualization help with disaster recovery within a data center? (Case 2)

  • A. Less energy is consumed.
  • B. Server provisioning is faster.
  • C. Hardware at the recovery site does not have to be identical to production equipment.
  • D. Power is always provided.

Explanation: Disaster recovery is how a company goes about accessing applications, data, and the hardware that might be affected during a disaster. Virtualization provides hardware independence which means the disaster recovery site does not have to have the exact equipment as the equipment in production. Server provisioning is relevant when a server is built for the first time. Although data centers do have backup generators, the entire data center is designed for disaster recovery. One particular data center could never guarantee that the data center itself would never be without power.

108. Refer to the exhibit. Which devices exist in the failure domain when switch S3 loses power?

Failure domain
  • A. S4 and PC_2
  • B. PC_3 and AP_2
  • C. AP_2 and AP_1
  • D. PC_3 and PC_2
  • E. S1 and S4

Explanation: The failure domain includes devices directly affected by S3's failure: PC_3 and AP_2.

109. Which set of access control entries would allow all users on the 192.168.10.0/24 network to access a web server that is located at 172.17.80.1, but would not allow them to use Telnet?

  • A. access-list 103 deny tcp host 192.168.10.0 any eq 23
    access-list 103 permit tcp host 192.168.10.1 eq 80
  • B. access-list 103 permit tcp 192.168.10.0 0.0.0.255 host 172.17.80.1 eq 80
    access-list 103 deny tcp 192.168.10.0 0.0.0.255 any eq 23
  • C. access-list 103 permit tcp 192.168.10.0 0.0.0.255 any eq 80
    access-list 103 deny tcp 192.168.10.0 0.0.0.255 any eq 23
  • D. access-list 103 permit 192.168.10.0 0.0.0.255 host 172.17.80.1
    access-list 103 deny tcp 192.168.10.0 0.0.0.255 any eq telnet

Explanation: The ACL permits HTTP to the web server and denies Telnet from the network.

110. Refer to the exhibit. A network administrator needs to add an ACE to the TRAFFIC-CONTROL ACL that will deny IP traffic from the subnet 172.23.16.0/20. Which ACE will meet this requirement?

ACL addition
  • A. 5 deny 172.23.16.0 0.0.15.255
  • B. 5 deny 172.23.16.0 0.0.255.255
  • C. 15 deny 172.23.16.0 0.0.15.255
  • D. 30 deny 172.23.16.0 0.0.15.255

Explanation: The only filtering criteria specified for a standard access list is the source IPv4 address. The wild card mask is written to identify what parts of the address to match, with a 0 bit, and what parts of the address should be ignored, which a 1 bit. The router will parse the ACE entries from lowest sequence number to highest. If an ACE must be added to an existing access list, the sequence number should be specified so that the ACE is in the correct place during the ACL evaluation process.

111. Which step in the link-state routing process is described by a router building a link-state database based on received LSAs?

  • A. executing the SPF algorithm
  • B. building the topology table
  • C. selecting the router ID
  • D. declaring a neighbor to be inaccessible

Explanation: Building the topology table involves creating the link-state database from LSAs.

112. What protocol uses agents, that reside on managed devices, to collect and store information about the device and its operation?

  • A. SYSLOG
  • B. TFTP
  • C. CBWFQ
  • D. SNMP

Explanation: SNMP uses agents on managed devices to collect and store information.

113. An administrator is configuring single-area OSPF on a router. One of the networks that must be advertised is 10.27.27.0 255.255.255.0. What wildcard mask would the administrator use in the OSPF network statement?

  • A. 0.0.0.63
  • B. 0.0.0.255
  • C. 0.0.0.31
  • D. 0.0.0.15

Explanation: The wildcard mask for 255.255.255.0 is 0.0.0.255.

114. When will an OSPF-enabled router transition from the Down state to the Init state?

  • A. when an OSPF-enabled interface becomes active
  • B. as soon as the router starts
  • C. when the router receives a hello packet from a neighbor router
  • D. as soon as the DR/BDR election process is complete

Explanation: When OSPFv2 is enabled, the enabled Gigabit Ethernet 0/0 interface transitions from the Down state to the Init state. R1 starts sending Hello packets out all OSPF-enabled interfaces to discover OSPF neighbors to develop adjacencies with.

115. What type of traffic is described as having a high volume of data per packet?

  • A. data
  • B. video
  • C. voice

Explanation: Video traffic has a high volume of data per packet.

116. What protocol is a vendor-neutral Layer 2 protocol that advertises the identity and capabilities of the host device to other connected network devices?

  • A. LLDP
  • B. NTP
  • C. TFTP
  • D. SNMP

Explanation: LLDP is a vendor-neutral Layer 2 discovery protocol.

117. Which step in the link-state routing process is described by a router running an algorithm to determine the best path to each destination?

  • A. building the topology table
  • B. selecting the router ID
  • C. declaring a neighbor to be inaccessible
  • D. executing the SPF algorithm

Explanation: The SPF algorithm calculates the best paths to all destinations.

118. Refer to the exhibit. Which conclusion can be drawn from this OSPF multiaccess network?

OSPF multiaccess
  • A. If the DR stops producing Hello packets, a BDR will be elected, and then it promotes itself to assume the role of DR.
  • B. With an election of the DR, the number of adjacencies is reduced from 6 to 3.
  • C. When a DR is elected all other non-DR routers become DROTHER.
  • D. All DROTHER routers will send LSAs to the DR and BDR to multicast 224.0.0.5.

Explanation: On OSPF multiaccess networks, a DR is elected to be the collection and distribution point for LSAs sent and received. A BDR is also elected in case the DR fails. All other non-DR or BDR routers become DROTHER. Instead of flooding LSAs to all routers in the network, DROTHERs only send their LSAs to the DR and BDR using the multicast address 224.0.0.6. If there is no DR/BDR election, the number of required adjacencies is n(n-1)/2 = > 4(4-1)/2 = 6. With the election, this number is reduced to 3.​

119. Refer to the exhibit. The network administrator has an IP address of 192.168.11.10 and needs access to manage R1. What is the best ACL type and placement to use in this situation?

ACL for management
  • A. extended ACL outbound on R2 WAN interface towards the internet
  • B. standard ACL inbound on R1 vty lines
  • C. extended ACLs inbound on R1 G0/0 and G0/1
  • D. extended ACL outbound on R2 S0/0/1

Explanation: Standard ACLs permit or deny packets based only on the source IPv4 address. Because all traffic types are permitted or denied, standard ACLs should be located as close to the destination as possible. Extended ACLs permit or deny packets based on the source IPv4 address and destination IPv4 address, protocol type, source and destination TCP or UDP ports and more. Because the filtering of extended ACLs is so specific, extended ACLs should be located as close as possible to the source of the traffic to be filtered. Undesirable traffic is denied close to the source network without crossing the network infrastructure.

120. Which type of VPN connects using the Transport Layer Security (TLS) feature?

  • A. SSL VPN
  • B. IPsec virtual tunnel interface
  • C. GRE over IPsec
  • D. dynamic multipoint VPN

Explanation: When a client negotiates an SSL VPN connection with the VPN gateway, it connects using Transport Layer Security (TLS). TLS is the newer version of SSL and is sometimes expressed as SSL/TLS. The two terms are often used interchangeably.

121. Which group of APIs are used by an SDN controller to communicate with various applications?

  • A. eastbound APIs
  • B. westbound APIs
  • C. northbound APIs
  • D. southbound APIs

Explanation: Northbound APIs connect the SDN controller to applications.

122. A company has consolidated a number of servers and it is looking for a program or firmware to create and control virtual machines which have access to all the hardware of the consolidated servers. What service or technology would support this requirement?

  • A. Cisco ACI
  • B. software defined networking
  • C. Type-1 hypervisor
  • D. APIC-EM

Explanation: A Type-1 hypervisor runs directly on hardware and manages virtual machines.

123. What command would be used as part of configuring NAT or PAT to identify inside local addresses that are to be translated?

  • A. ip nat inside source list 24 interface serial 0/1/0 overload
  • B. ip nat inside source list 14 pool POOL-STAT overload
  • C. access-list 10 permit 172.19.89.0 0.0.0.255
  • D. ip nat inside source list ACCTNG pool POOL-STAT

Explanation: An ACL identifies the inside local addresses that will be translated.

124. Anycompany has decided to reduce its environmental footprint by reducing energy costs, moving to a smaller facility, and promoting telecommuting. What service or technology would support this requirement?

  • A. Cloud services
  • B. Data center
  • C. APIC-EM
  • D. Cisco ACI

Explanation: Cloud services reduce energy costs and support telecommuting.

125. Refer to the exhibit. An administrator is trying to back up the current running configuration of the router to a USB drive, and enters the command
copy usbflash0:/R1-config running-config
on the router command line. After removing the USB drive and connecting it to a PC, the administrator discovers that the running configuration was not properly backed up to the R1-config file. What is the problem?

USB backup
  • A. The file already exists on the USB drive and cannot be overwritten.
  • B. The drive was not properly formatted with the FAT16 file system.
  • C. There is no space left on the USB drive.
  • D. The USB drive is not recognized by the router.
  • E. The command that the administrator used was incorrect.

Explanation: The correct command is copy running-config usbflash0:/R1-config.

126. Which three types of VPNs are examples of enterprise-managed site-to-site VPNs? (Choose three.)

  • A. Layer 3 MPLS VPN
  • B. IPsec VPN
  • C. Cisco Dynamic Multipoint VPN
  • D. GRE over IPsec VPN
  • E. clientless SSL VPN
  • F. client-based IPsec VPN

Explanation: IPsec VPN, DMVPN, and GRE over IPsec are enterprise-managed site-to-site VPNs.

127. Refer to the exhibit. Employees on 192.168.11.0/24 work on critically sensitive information and are not allowed access off their network. What is the best ACL type and placement to use in this situation?

ACL for sensitive network
  • A. standard ACL inbound on R1 vty lines
  • B. extended ACL inbound on R1 G0/0
  • C. standard ACL inbound on R1 G0/1
  • D. extended ACL inbound on R3 S0/0/1

Explanation: A standard ACL inbound on the interface closest to the source restricts traffic from that network.

128. In an OSPF network which two statements describe the link-state database (LSDB)? (Choose two.)

  • A. It can be viewed by using the show ip ospf database command.
  • B. A neighbor table is created based on the LSDB.
  • C. It contains a list of only the best routes to a particular network.
  • D. It contains a list of all neighbor routers to which a router has established bidirectional communication.
  • E. All routers within an area have an identical link-state database.

Explanation: The LSDB is identical across all routers in an OSPF area and can be viewed with show ip ospf database.

129. In an OSPF network which OSPF structure is used to create the neighbor table on a router?

  • A. adjacency database
  • B. link-state database
  • C. routing table
  • D. forwarding database

Explanation: The adjacency database contains the neighbor table.

130. What protocol is used in a system that consists of three elements--a manager, agents, and an information database?

  • A. MPLS
  • B. SYSLOG
  • C. SNMP
  • D. TFTP

Explanation: SNMP consists of a manager, agents, and a MIB (information database).

131. What type of traffic is described as not resilient to loss?

  • A. data
  • B. video
  • C. voice

Explanation: Video traffic tends to be unpredictable, inconsistent, and bursty compared to voice traffic. Compared to voice, video is less resilient to loss and has a higher volume of data per packet.

132. Refer to the exhibit. Router R1 is configured with static NAT. Addressing on the router and the web server are correctly configured, but there is no connectivity between the web server and users on the Internet. What is a possible reason for this lack of connectivity?

Static NAT issue
  • A. Interface Fa0/0 should be configured with the command ip nat outside.
  • B. The inside global address is incorrect.
  • C. The router NAT configuration has an incorrect inside local address.
  • D. The NAT configuration on interface S0/0/1 is incorrect.

Explanation: The inside local address in the static NAT configuration may be incorrect.

133. Which type of API would be used to allow authorized salespeople of an organization access to internal sales data from their mobile devices?

  • A. open
  • B. partner
  • C. public
  • D. private

Explanation: Private, or internal, APIs are used only within an organization and are for company access to data and services for internal use.

134. Refer to the exhibit. Which data format is used to represent the data for network automation applications?

XML example
  • A. XML
  • B. HTML
  • C. YAML
  • D. JSON

Explanation: Common data formats that are used in many applications including network automation and programmability include these:
JavaScript Object Notation (JSON) – In JSON, the data known as an object is one or more key/value pairs enclosed in braces { }. Keys must be strings within double quotation marks ” “. Keys and values are separated by a colon.
eXtensible Markup Language (XML) – In XML, the data is enclosed within a related set of tags data.
YAML Ain’t Markup Language (YAML) – In YAML, the data known as an object is one or more key value pairs. Key value pairs are separated by a colon without the use of quotation marks. YAML uses indentation to define its structure, without the use of brackets or commas.

135. An ACL is applied inbound on a router interface. The ACL consists of a single entry:
access-list 101 permit udp 192.168.100.32 0.0.0.7 host 198.133.219.76 eq telnet .
If a packet with a source address of 198.133.219.100, a destination address of 198.133.219.170, and a protocol of 23 is received on the interface, is the packet permitted or denied?

  • A. denied
  • B. permitted

Explanation: The source address (198.133.219.100) does not match the ACL's source range (192.168.100.32/29), so it is denied.

136. Refer to the exhibit. If no router ID was manually configured, what would router R1 use as its OSPF router ID?

OSPF router ID
  • A. 10.0.0.1
  • B. 10.1.0.1
  • C. 192.168.1.100
  • D. 209.165.201.1

Explanation: OSPF uses the highest active IP address as the router ID if no router-id is configured.

137. What protocol is a vendor-neutral Layer 2 protocol that advertises the identity and capabilities of the host device to other connected network devices? (Duplicate)

  • A. NTP
  • B. LLDP
  • C. SNMP
  • D. MPLS

Explanation: LLDP is a vendor-neutral Layer 2 discovery protocol.

138. Which type of VPN uses a hub-and-spoke configuration to establish a full mesh topology?

  • A. MPLS VPN
  • B. GRE over IPsec
  • C. IPsec virtual tunnel interface
  • D. dynamic multipoint VPN

Explanation: DMVPN uses a hub-and-spoke configuration to establish a full mesh topology dynamically.

139. What is a characteristic of the REST API?

  • A. evolved into what became SOAP
  • B. used for exchanging XML structured information over HTTP or SMTP
  • C. considered slow, complex, and rigid
  • D. most widely used API for web services

Explanation: REST accounts for more than 80% of all API types used for web services, making it the most widely used web service API.

141. A student, doing a summer semester of study overseas, has taken hundreds of pictures on a smartphone and wants to back them up in case of loss. What service or technology would support this requirement?

  • A. Cisco ACI
  • B. cloud services
  • C. software defined networking
  • D. dedicated servers

Explanation: Cloud services provide backup and storage accessible from anywhere.

142. Consider the following access list that allows IP phone configuration file transfers from a particular host to a TFTP server. Which method would allow the network administrator to modify the ACL and include FTP transfers from any source IP address?

R1(config)# access-list 105 permit udp host 10.0.70.23 host 10.0.54.5 range 1024 5000
R1(config)# access-list 105 deny ip any any
R1(config)# interface gi0/0
R1(config-if)# ip access-group 105 out
  • A. R1(config)# interface gi0/0
    R1(config-if)# no ip access-group 105 out
    R1(config)# access-list 105 permit tcp any host 10.0.54.5 eq 20
    R1(config)# access-list 105 permit tcp any host 10.0.54.5 eq 21
    R1(config)# interface gi0/0
    R1(config-if)# ip access-group 105 out
  • B. R1(config)# access-list 105 permit tcp any host 10.0.54.5 eq 20
    R1(config)# access-list 105 permit tcp any host 10.0.54.5 eq 21
  • C. R1(config)# interface gi0/0
    R1(config-if)# no ip access-group 105 out
    R1(config)# no access-list 105
    R1(config)# access-list 105 permit udp host 10.0.70.23 host 10.0.54.5 range 1024 5000
    R1(config)# access-list 105 permit tcp any host 10.0.54.5 eq 20
    R1(config)# access-list 105 permit tcp any host 10.0.54.5 eq 21
    R1(config)# access-list 105 deny ip any any
    R1(config)# interface gi0/0
    R1(config-if)# ip access-group 105 out
  • D. R1(config)# access-list 105 permit udp host 10.0.70.23 host 10.0.54.5 range 1024 5000
    R1(config)# access-list 105 permit tcp any host 10.0.54.5 eq 20
    R1(config)# access-list 105 permit tcp any host 10.0.54.5 eq 21
    R1(config)# access-list 105 deny ip any any

Explanation: To modify an existing ACL, it must be removed and recreated with the new entries.

143. Which three statements are generally considered to be best practices in the placement of ACLs? (Choose three.)

  • A. Filter unwanted traffic before it travels onto a low-bandwidth link.
  • B. Place standard ACLs close to the destination IP address of the traffic.
  • C. Place standard ACLs close to the source IP address of the traffic.
  • D. Place extended ACLs close to the destination IP address of the traffic.
  • E. Place extended ACLs close to the source IP address of the traffic.
  • F. For every inbound ACL placed on an interface, there should be a matching outbound ACL.

Explanation: Extended ACLs should be placed as close as possible to the source IP address, so that traffic that needs to be filtered does not cross the network and use network resources. Because standard ACLs do not specify a destination address, they should be placed as close to the destination as possible. Placing a standard ACL close to the source may have the effect of filtering all traffic, and limiting services to other hosts. Filtering unwanted traffic before it enters low-bandwidth links preserves bandwidth and supports network functionality. Decisions on placing ACLs inbound or outbound are dependent on the requirements to be met.

144. Match the term to the web link component. (Not all options are used.)

URL components

Explanation: URL components: protocol, URN, URL, URI, and fragment.

ComponentExample
protocolhttp
URNwww.buycarsfromus.com/2020models/ford/suv.html
URLhttp://www.buycarsfromus.com/2020models/ford/suv.html
URIhttp://www.buycarsfromus.com/2020models/ford/suv.html#Escape
fragment#Escape

145. What command would be used as part of configuring NAT or PAT to display all static translations that have been configured?

  • A. show ip nat translations
  • B. show ip pat translations
  • C. show ip cache
  • D. show running-config

Explanation: show ip nat translations displays all NAT translations, including static ones.

146. A network administrator modified an OSPF-enabled router to have a hello timer setting of 20 seconds. What is the new dead interval time setting by default?

  • A. 40 seconds
  • B. 60 seconds
  • C. 80 seconds
  • D. 100 seconds

Explanation: The dead interval is 4 times the hello interval by default: 20 × 4 = 80 seconds.

147. Which type of VPN is the preferred choice for support and ease of deployment for remote access?

  • A. SSL VPN
  • B. GRE over IPsec
  • C. dynamic multipoint VPN
  • D. IPsec virtual tunnel interface

Explanation: SSL VPNs are preferred for remote access due to ease of deployment and support.

148. What type of traffic is described as predictable and smooth?

  • A. video
  • B. data
  • C. voice

Explanation: Voice traffic is predictable and smooth compared to data and video.

149. Which queuing mechanism has no provision for prioritizing or buffering but simply forwards packets in the order they arrive?

  • A. FIFO
  • B. LLQ
  • C. CBWFQ
  • D. WFQ

Explanation: FIFO (First In, First Out) forwards packets in the order they arrive.

150. Refer to the exhibit. A network administrator has configured OSPFv2 on the two Cisco routers. The routers are unable to form a neighbor adjacency. What should be done to fix the problem on router R2?

OSPF adjacency
  • A. Implement the command no passive-interface Serial0/1.
  • B. Implement the command network 192.168.2.6 0.0.0.0 area 0 on router R2.
  • C. Change the router-id of router R2 to 2.2.2.2.
  • D. Implement the command network 192.168.3.1 0.0.0.0 area 0 on router R2.

Explanation: The interface is configured as passive, preventing OSPF adjacency. Remove passive-interface.

151. A network administrator is troubleshooting an OSPF problem that involves neighbor adjacency. What should the administrator do?

  • A. Make sure that the router priority is unique on each router.
  • B. Make sure that the DR/BDR election is complete.
  • C. Make sure that the router ID is included in the hello packet.
  • D. Make sure that the hello and dead interval timers are the same on all routers.

Explanation: Hello and dead intervals must match for OSPF neighbors to form adjacency.

152. Refer to the exhibit. Internet privileges for an employee have been revoked because of abuse but the employee still needs access to company resources. What is the best ACL type and placement to use in this situation?

ACL for internet access
  • A. standard ACL inbound on R2 WAN interface connecting to the internet
  • B. standard ACL outbound on R2 WAN interface towards the internet
  • C. standard ACL inbound on R1 G0/0
  • D. standard ACL outbound on R1 G0/0

Explanation: – Standard ACLs permit or deny packets based only on the source IPv4 address. Because all traffic types are permitted or denied, standard ACLs should be located as close to the destination as possible. – Extended ACLs permit or deny packets based on the source IPv4 address and destination IPv4 address, protocol type, source and destination TCP or UDP ports and more. Because the filtering of extended ACLs is so specific, extended ACLs should be located as close as possible to the source of the traffic to be filtered. Undesirable traffic is denied close to the source network without crossing the network infrastructure.

153. An ACL is applied inbound on a router interface. The ACL consists of a single entry:
access-list 100 permit tcp 192.168.10.0 0.0.0.255 172.17.200.0 0.0.0.255 eq www .
If a packet with a source address of 192.168.10.244, a destination address of 172.17.200.56, and a protocol of 80 is received on the interface, is the packet permitted or denied?

  • A. denied
  • B. permitted

Explanation: The packet matches the ACL's source, destination, and protocol (HTTP port 80), so it is permitted.

154. A company has contracted with a network security firm to help identify the vulnerabilities of the corporate network. The firm sends a team to perform penetration tests to the company network. Why would the team use applications such as Nmap, SuperScan, and Angry IP Scanner?

  • A. to detect installed tools within files and directories that provide threat actors remote access and control over a computer or network
  • B. to detect any evidence of a hack or malware in a computer or network
  • C. to reverse engineer binary files when writing exploits and when analyzing malware
  • D. to probe network devices, servers, and hosts for open TCP or UDP ports

Explanation: Nmap and similar tools are used for port scanning and network discovery.

155. What command would be used as part of configuring NAT or PAT to display any dynamic PAT translations that have been created by traffic?

  • A. show ip pat translations
  • B. show ip cache
  • C. show running-config
  • D. show ip nat translations

Explanation: show ip nat translations displays both static and dynamic NAT/PAT entries.

156. An administrator is configuring single-area OSPF on a router. One of the networks that must be advertised is 172.16.91.0 255.255.255.192. What wildcard mask would the administrator use in the OSPF network statement?

  • A. 0.0.31.255
  • B. 0.0.0.63
  • C. 0.0.15.255
  • D. 0.0.7.255

Explanation: The wildcard mask for 255.255.255.192 is 0.0.0.63.

157. What type of traffic is described as requiring latency to be no more than 400 milliseconds (ms)?

  • A. video
  • B. data
  • C. voice

Explanation: Video traffic requires latency of no more than 400 ms.

158. Refer to the exhibit. Which two configurations would be used to create and apply a standard access list on R1, so that only the 10.0.70.0/25 network devices are allowed to access the internal database server? (Choose two.)

ACL for database
  • A. R1(config)# interface GigabitEthernet0/0
    R1(config-if)# ip access-group 5 out
  • B. R1(config)# access-list 5 permit 10.0.54.0 0.0.1.255
  • C. R1(config)# interface Serial0/0/0
    R1(config-if)# ip access-group 5 in
  • D. R1(config)# access-list 5 permit 10.0.70.0 0.0.0.127
  • E. R1(config)# access-list 5 permit any

Explanation: A standard ACL permits the 10.0.70.0/25 network and is applied outbound on the interface.

159. A network administrator is writing a standard ACL that will deny any traffic from the 172.16.0.0/16 network, but permit all other traffic. Which two commands should be used? (Choose two.)

  • A. Router(config)# access-list 95 deny 172.16.0.0 255.255.0.0
  • B. Router(config)# access-list 95 permit any
  • C. Router(config)# access-list 95 host 172.16.0.0
  • D. Router(config)# access-list 95 deny 172.16.0.0 0.0.255.255
  • E. Router(config)# access-list 95 172.16.0.0 255.255.255.255
  • F. Router(config)# access-list 95 deny any

Explanation: To deny traffic from the 172.16.0.0/16 network, the access-list 95 deny 172.16.0.0 0.0.255.255 command is used. To permit all other traffic, the access-list 95 permit any statement is added.

160. Refer to the exhibit. The company has decided that no traffic initiating from any other existing or future network can be transmitted to the Research and Development network. Furthermore, no traffic that originates from the Research and Development network can be transmitted to any other existing or future networks in the company. The network administrator has decided that extended ACLs are better suited for these requirements. Based on the information given, what will the network administrator do?

ACL for R&D
  • A. One ACL will be placed on the R1 Gi0/0 interface and one ACL will be placed on the R2 Gi0/0 interface.
  • B. Only a numbered ACL will work for this situation.
  • C. One ACL will be placed on the R2 Gi0/0 interface and one ACL will be placed on the R2 S0/0/0 interface.
  • D. Two ACLs (one in each direction) will be placed on the R2 Gi0/0 interface.

Explanation: Extended ACLs in both directions on the R&D interface will enforce the traffic restrictions.

161. What protocol uses smaller stratum numbers to indicate that the server is closer to the authorized time source than larger stratum numbers?

  • A. TFTP
  • B. SYSLOG
  • C. NTP
  • D. MPLS

Explanation: In NTP, lower stratum numbers indicate closer proximity to the authoritative time source.

162. Refer to the exhibit. If no router ID was manually configured, what would router Branch1 use as its OSPF router ID?

OSPF router ID Branch
  • A. 10.0.0.1
  • B. 10.1.0.1
  • C. 192.168.1.100
  • D. 209.165.201.1

Explanation: In OSPFv2, a Cisco router uses a three-tier method to derive its router ID. The first choice is the manually configured router ID with the router-id command. If the router ID is not manually configured, the router will choose the highest IPv4 address of the configured loopback interfaces. Finally if no loopback interfaces are configured, the router chooses the highest active IPv4 address of its physical interfaces.

163. Match the HTTP method with the RESTful operation. (Duplicate)

HTTP methods
HTTP MethodRESTful Operation
POSTcreate
GETread
PUT/PATCHupdate
DELETEdelete

164. Refer to the exhibit. A web designer calls to report that the web server web-s1.cisco.com is not reachable through a web browser. The technician uses command line utilities to verify the problem and to begin the troubleshooting process. Which two things can be determined about the problem? (Choose two.)

DNS troubleshooting
  • A. The web server at 192.168.0.10 is reachable from the source host.
  • B. DNS cannot resolve the IP address for the server web-s1.cisco.com.
  • C. A router is down between the source host and the server web-s1.cisco.com.
  • D. There is a problem with the web server software on web-s1.cisco.com.
  • E. The default gateway between the source host and the server at 192.168.0.10 is down.

Explanation: The successful result of the ping to the IP address indicates that the network is operational and the web server is online. However, the fact that the ping to the domain name of the server fails indicates there is a DNS issue, namely that the host cannot resolve the domain name to its associated IP address.

165. What type of traffic is described as tending to be unpredictable, inconsistent, and bursty?

  • A. video
  • B. voice
  • C. data

Explanation: Video traffic is unpredictable, inconsistent, and bursty.

166. Match the functions to the corresponding layers. (Not all options are used.)

Cisco layers
Access LayerDistribution LayerCore Layer
provides network access to the userimplements network access policyprovides high-speed backbone connectivity
represents the network edgeestablishes Layer 3 routing boundariesfunctions as an aggregator for all the campus blocks

167. What type of traffic is described as consisting of traffic that requires a higher priority if interactive?

  • A. voice
  • B. data
  • C. video

Explanation: Interactive data traffic requires higher priority.

168. Which type of VPN provides a flexible option to connect a central site with branch sites?

  • A. IPsec virtual tunnel interface
  • B. MPLS VPN
  • C. dynamic multipoint VPN
  • D. GRE over IPsec

Explanation: DMVPN provides a flexible hub-and-spoke VPN solution.

169. A company has contracted with a network security firm to help identify the vulnerabilities of the corporate network. The firm sends a team to perform penetration tests to the company network. Why would the team use fuzzers?

  • A. to discover security vulnerabilities of a computer
  • B. to detect any evidence of a hack or malware in a computer or network
  • C. to reverse engineer binary files when writing exploits and when analyzing malware
  • D. to detect installed tools within files and directories that provide threat actors remote access and control over a computer or network

Explanation: Fuzzers are used to discover security vulnerabilities by sending malformed input.

170. Refer to the exhibit. A network administrator has configured a standard ACL to permit only the two LAN networks attached to R1 to access the network that connects to R2 G0/1 interface, but not the G0/0 interface. When following the best practices, in what location should the standard ACL be applied?

ACL for LANs
  • A. R1 S0/0/0 outbound
  • B. R2 G0/0 outbound
  • C. R2 S0/0/1 outbound
  • D. R1 S0/0/0 inbound
  • E. R2 G0/1 inbound

Explanation: Standard ACLs should be placed close to the destination, so outbound on R2 G0/0.

171. Two OSPF-enabled routers are connected over a point-to-point link. During the ExStart state, which router will be chosen as the first one to send DBD packets?

  • A. the router with the highest router ID
  • B. the router with the lowest IP address on the connecting interface
  • C. the router with the highest IP address on the connecting interface
  • D. the router with the lowest router ID

Explanation: In the ExStart state, the two routers decide which router will send the DBD packets first. The router with the higher router ID will be the first router to send DBD packets during the Exchange state

172. Which step in the link-state routing process is described by a router sending Hello packets out all of the OSPF-enabled interfaces?

  • A. exchanging link-state advertisements
  • B. electing the designated router
  • C. injecting the default route
  • D. establishing neighbor adjacencies

Explanation: OSPF-enabled routers must recognize each other on the network before they can share information. An OSPF-enabled router sends Hello packets out all OSPF-enabled interfaces to determine if neighbors are present on those links. If a neighbor is present, the OSPF-enabled router attempts to establish a neighbor adjacency with that neighbor.

173. A company has contracted with a network security firm to help identify the vulnerabilities of the corporate network. The firm sends a team to perform penetration tests to the company network. Why would the team use forensic tools?

  • A. to obtain specially designed operating systems preloaded with tools optimized for hacking
  • B. to detect any evidence of a hack or malware in a computer or network
  • C. to detect installed tools within files and directories that provide threat actors remote access and control over a computer or network
  • D. to reverse engineer binary files when writing exploits and when analyzing malware

Explanation: Forensic tools are used to detect evidence of hacking or malware.

174. Refer to the exhibit. A network administrator has configured OSPFv2 on the two Cisco routers but PC1 is unable to connect to PC2. What is the most likely problem?

OSPF connectivity
  • A. Interface Fa0/0 has not been activated for OSPFv2 on router R2.
  • B. Interface Fa0/0 is configured as a passive-interface on router R2.
  • C. Interface S0/0 is configured as a passive-interface on router R2.
  • D. Interface s0/0 has not been activated for OSPFv2 on router R2.

Explanation: If a LAN network is not advertised using OSPFv2, a remote network will not be reachable. The output displays a successful neighbor adjacency between router R1 and R2 on the interface S0/0 of both routers.

175. ABCTech is investigating the use of automation for some of its products. In order to control and test these products, the programmers require Windows, Linux, and MAC OS on their computers. What service or technology would support this requirement?

  • A. dedicated servers
  • B. software defined networking
  • C. virtualization
  • D. Cisco ACI

Explanation: Virtualization allows multiple operating systems to run on a single machine.

176. A network engineer has noted that some expected network route entries are not displayed in the routing table. Which two commands will provide additional information about the state of router adjacencies, timer intervals, and the area ID? (Choose two.)

  • A. show ip protocols
  • B. show ip ospf neighbor
  • C. show running-configuration
  • D. show ip ospf interface
  • E. show ip route ospf

Explanation: The show ip ospf interface command will display routing table information that is already known. The show running-configuration and show ip protocols commands will display aspects of the OSPF configuration on the router but will not display adjacency state details or timer interval details.

177. Which type of VPN involves the forwarding of traffic over the backbone through the use of labels distributed among core routers?

  • A. MPLS VPN
  • B. GRE over IPsec
  • C. IPsec virtual tunnel interface
  • D. dynamic multipoint VPN

Explanation: MPLS VPN uses labels to forward traffic across the provider backbone.

178. Which type of VPN involves a nonsecure tunneling protocol being encapsulated by IPsec?

  • A. SSL VPN
  • B. dynamic multipoint VPN
  • C. GRE over IPsec
  • D. IPsec virtual tunnel interface

Explanation: GRE (nonsecure) is encapsulated by IPsec to provide security.

179. A company has contracted with a network security firm to help identify the vulnerabilities of the corporate network. The firm sends a team to perform penetration tests to the company network. Why would the team use hacking operation systems?

  • A. to detect any evidence of a hack or malware in a computer or network
  • B. to obtain specially designed operating systems preloaded with tools optimized for hacking
  • C. to encode data, using algorithm schemes, to prevent unauthorized access to the encrypted data
  • D. to reverse engineer binary files when writing exploits and when analyzing malware

Explanation: Hacking operating systems come preloaded with penetration testing tools.

180. What command would be used as part of configuring NAT or PAT to identify an interface as part of the external global network?

  • A. ip pat inside
  • B. access-list 10 permit 172.19.89.0 0.0.0.255
  • C. ip nat inside
  • D. ip nat outside

Explanation: The ip nat outside command identifies the external (global) interface.

181. To avoid purchasing new hardware, a company wants to take advantage of idle system resources and consolidate the number of servers while allowing for multiple operating systems on a single hardware platform. What service or technology would support this requirement?

  • A. data center
  • B. cloud services
  • C. virtualization
  • D. dedicated servers

Explanation: Server virtualization takes advantage of idle resources and consolidates the number of required servers. This also allows for multiple operating systems to exist on a single hardware platform.

182. Which type of VPN routes packets through virtual tunnel interfaces for encryption and forwarding?

  • A. MPLS VPN
  • B. IPsec virtual tunnel interface
  • C. dynamic multipoint VPN
  • D. GRE over IPsec

Explanation: IPsec VTI uses virtual tunnel interfaces for encryption and forwarding.

183. Which step in the link-state routing process is described by a router flooding link-state and cost information about each directly connected link?

  • A. building the topology table
  • B. selecting the router ID
  • C. exchanging link-state advertisements
  • D. injecting the default route

Explanation: Link-state advertisements are flooded to exchange link-state information.

184. What type of traffic is described as using either TCP or UDP depending on the need for error recovery?

  • A. video
  • B. voice
  • C. data

Explanation: Data traffic can use TCP or UDP based on error recovery requirements.

185. Refer to the exhibit. The company CEO demands that one ACL be created to permit email traffic to the internet and deny FTP access. What is the best ACL type and placement to use in this situation?

ACL for email
  • A. extended ACL outbound on R2 WAN interface towards the internet
  • B. standard ACL outbound on R2 S0/0/0
  • C. extended ACL inbound on R2 S0/0/0
  • D. standard ACL inbound on R2 WAN interface connecting to the internet

Explanation: An extended ACL on the outbound WAN interface can permit email and deny FTP.

186. What command would be used as part of configuring NAT or PAT to define a pool of addresses for translation?

  • A. ip nat inside source static 172.19.89.13 198.133.219.65
  • B. ip nat inside source list 24 interface serial 0/1/0 overload
  • C. ip nat pool POOL-STAT 64.100.14.17 64.100.14.30 netmask 255.255.255.240
  • D. ip nat outside

Explanation: The ip nat pool command defines a pool of addresses for NAT.

187. What is the name of the layer in the Cisco borderless switched network design that is considered to be the backbone used for high-speed connectivity and fault isolation?

  • A. data link
  • B. access
  • C. core
  • D. network
  • E. network access

Explanation: The three layers of the Cisco borderless switch network design are access, distribution, and core. The access layer switches are the ones used to connect end devices to the network. The distribution layer switches accept connections from access layer switches and provides switching, routing, and access policy functions. The core layer is called the backbone and core switches commonly have high-speed redundant connections.

188. An ACL is applied inbound on router interface. The ACL consists of a single entry:
access-list 210 permit tcp 172.18.20.0 0.0.0.47 any eq ftp
If a packet with a source address of 172.18.20.40, a destination address of 10.33.19.2, and a protocol of 21 is received on the interface, is the packet permitted or denied?

  • A. permitted
  • B. denied

Explanation: The source address 172.18.20.40 is within the range 172.18.20.0/27 (wildcard 0.0.0.47), and protocol is FTP (port 21), so it is permitted.

189. What type of traffic is described as consisting of traffic that gets a lower priority if it is not mission-critical?

  • A. video
  • B. data
  • C. voice

Explanation: Non-mission-critical data traffic gets lower priority.

190. Which OSPF table is identical on all converged routers within the same OSPF area?

  • A. routing
  • B. neighbor
  • C. adjacency
  • D. topology

Explanation: The topology table (link-state database) is identical across all routers in an OSPF area.

191. An ACL is applied inbound on a router interface. The ACL consists of a single entry: access-list 100 permit tcp 192.168.10.0 0.0.0.255 any eq www . If a packet with a source address of 192.168.10.45, a destination address of 10.10.3.27, and a protocol of 80 is received on the interface, is the packet permitted or denied?

  • A. permitted
  • B. denied

Explanation: The packet matches the source network and HTTP (port 80), so it is permitted.

192. What protocol allows the manager to poll agents to access information from the agent MIB?

  • A. CBWFQ
  • B. SYSLOG
  • C. TFTP
  • D. SNMP

Explanation: SNMP allows managers to poll agents and access MIB information.

193. Match each component of a WAN connection to its description. (Not all options are used.)

WAN components

Explanation: Match WAN components to their descriptions.

194. What type of traffic is described as being able to tolerate a certain amount of latency, jitter, and loss without any noticeable effects?

  • A. voice
  • B. video
  • C. data

Explanation: Voice traffic can tolerate some latency, jitter, and loss.

195. What term describes adding a value to the packet header, as close to the source as possible, so that the packet matches a defined policy?

  • A. policing
  • B. traffic marking
  • C. weighted random early detection (WRED)
  • D. traffic shaping
  • E. tail drop

Explanation: Traffic marking adds a value to the packet header to match a policy.

196. Which three traffic-related factors would influence selecting a particular WAN link type? (Choose three.)

  • A. cost of the link
  • B. amount of traffic
  • C. distance between sites
  • D. reliability
  • E. security needs
  • F. type of traffic

Explanation: The traffic-related factors that influence selecting a particular WAN link type include the type of traffic, amount of traffic, quality requirements, and security requirements. Quality requirements include ensuring that traffic that cannot tolerate delay gets priority treatment as well as important business transactional traffic.

197. What command would be used as part of configuring NAT or PAT to link the inside local addresses to the pool of addresses available for PAT translation?

  • A. ip nat inside source list ACCTNG pool POOL-STAT
  • B. ip nat translation timeout 36000
  • C. ip nat inside source list 14 pool POOL-STAT overload
  • D. ip nat inside source static 172.19.89.13 198.133.219.65

Explanation: The ip nat inside source list 14 pool POOL-STAT overload command links inside addresses to a PAT pool.

198. What protocol is a vendor-neutral Layer 2 discovery protocol that must be configured separately to transmit and receive information packets?

  • A. SNMP
  • B. MPLS
  • C. LLDP
  • D. NTP

Explanation: LLDP must be configured separately to transmit and receive information.

199. An ACL is applied inbound on a router interface. The ACL consists of a single entry:
access-list 210 permit tcp 172.18.20.0 0.0.0.31 172.18.20.32 0.0.0.31 eq ftp .
If a packet with a source address of 172.18.20.55, a destination address of 172.18.20.3, and a protocol of 21 is received on the interface, is the packet permitted or denied?

  • A. permitted
  • B. denied

Explanation: The source address 172.18.20.55 is not in the range 172.18.20.0/27, so it is denied.

200. Refer to the exhibit. Corporate policy demands that access to the server network be restricted to internal employees only. What is the best ACL type and placement to use in this situation?

ACL for internal access
  • A. extended ACL outbound on R2 S0/0/1
  • B. standard ACL outbound on R2 S0/0/0
  • C. standard ACL inbound on R2 WAN interface connecting to the internet
  • D. extended ACL inbound on R2 S0/0/0

Explanation: An extended ACL outbound on the interface connected to the server network restricts access to internal employees.

201. A technician is working on a Layer 2 switch and notices that a %CDP-4-DUPLEX_MISMATCH message keeps appearing for port G0/5. What command should the technician issue on the switch to start the troubleshooting process?

  • A. show cdp neighbors
  • B. show ip interface brief
  • C. show interface g0/5
  • D. show cdp

Explanation: show interface g0/5 displays the duplex settings and helps diagnose the mismatch.

202. Which virtual resource would be installed on a network server to provide direct access to hardware resources?

  • A. VMware Fusion
  • B. a management console
  • C. a dedicated VLAN
  • D. a Type 1 hypervisor

Explanation: Type 1 hypervisors, the hypervisor is installed directly on the server or networking hardware. Then, instances of an OS are installed on the hypervisor, as shown in the figure. Type 1 hypervisors have direct access to the hardware resources. Therefore, they are more efficient than hosted architectures. Type 1 hypervisors improve scalability, performance, and robustness.

203. Refer to the exhibit. A network administrator has configured a standard ACL to permit only the two LAN networks attached to R1 to access the network that connects to R2 G0/1 interface. When following the best practices, in what location should the standard ACL be applied?

ACL for LANs to G0/1
  • A. R2 G0/1 inbound
  • B. R2 S0/0/1 outbound
  • C. R1 S0/0/0 outbound
  • D. R2 G0/1 outbound
  • E. R2 G0/0 outbound

Explanation: Standard ACLs should be placed close to the destination, so outbound on R2 G0/1.

204. Which OSPF database is identical on all converged routers within the same OSPF area?

  • A. neighbor
  • B. forwarding
  • C. link-state
  • D. adjacency

Explanation: Regardless of which OSPF area a router resides in, the adjacency database, routing table, and forwarding database are unique for each router. The link-state database lists information about all other routers within an area and is identical across all OSPF routers participating in that area.

205. What are two features to consider when creating a named ACL? (Choose two.)

  • A. Use alphanumeric characters if needed.
  • B. Use special characters, such as ! or * to show the importance of the ACL.
  • C. Modify the ACL using a text editor.
  • D. Be descriptive when creating the ACL name.
  • E. Use a space for ease of reading to separate the name from the description

Explanation: The following summarizes the rules to follow for named ACLs:
Assign a name to identify the purpose of the ACL. Names can contain alphanumeric characters. Names cannot contain spaces or punctuation. It is suggested that the name be written in CAPITAL LETTERS. Entries can be added or deleted within the ACL.

206. Match the RESTful API method to CRUD function.

RESTful CRUD

Explanation: Match RESTful methods to CRUD operations.

207. What type of traffic is described as requiring at least 384 Kbps of bandwidth?

  • A. voice
  • B. data
  • C. video

Explanation: Video traffic requires at least 384 Kbps of bandwidth.

208. Which step in the link-state routing process is described by a router inserting best paths into the routing table?

  • A. declaring a neighbor to be inaccessible
  • B. executing the SPF algorithm
  • C. load balancing equal-cost paths
  • D. choosing the best route

Explanation: Choosing the best route inserts the best paths into the routing table.

209. Anycompany has decided to reduce its environmental footprint by reducing energy costs, moving to a smaller facility, and promoting telecommuting. What service or technology would support this requirement? (Duplicate)

  • A. data center
  • B. virtualization
  • C. cloud services
  • D. dedicated servers

Explanation: Cloud services support telecommuting and reduce energy costs.

210. Which QoS technique smooths packet output rate?

  • A. policing
  • B. shaping
  • C. weighted random early detection
  • D. Integrated Services (IntServ)
  • E. marking

Explanation: Traffic shaping smooths the packet output rate by buffering excess packets.

211. Refer to the exhibit. The company has provided IP phones to employees on the 192.168.10.0/24 network and the voice traffic will need priority over data traffic. What is the best ACL type and placement to use in this situation?

ACL for voice priority
  • A. extended ACL inbound on R1 G0/0
  • B. extended ACL outbound on R2 WAN interface towards the internet
  • C. extended ACL outbound on R2 S0/0/1
  • D. extended ACLs inbound on R1 G0/0 and G0/1

Explanation: Standard ACLs permit or deny packets based only on the source IPv4 address. Because all traffic types are permitted or denied, standard ACLs should be located as close to the destination as possible. Extended ACLs permit or deny packets based on the source IPv4 address and destination IPv4 address, protocol type, source and destination TCP or UDP ports and more. Because the filtering of extended ACLs is so specific, extended ACLs should be located as close as possible to the source of the traffic to be filtered. Undesirable traffic is denied close to the source network without crossing the network infrastructure.

212. A network technician is configuring SNMPv3 and has set a security level of SNMPv3 authPriv. What is a feature of using this level?

  • A. authenticates a packet by using the SHA algorithm only
  • B. authenticates a packet by a string match of the username or community string
  • C. authenticates a packet by using either the HMAC with MD5 method or the SHA method
  • D. authenticates a packet by using either the HMAC MD5 or HMAC SHA algorithms and a username

Explanation: SNMPv3 authPriv level provides authentication (HMAC-MD5 or HMAC-SHA) and privacy (encryption).

CCNA Exams Answers

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Understanding the CCNA 3 v7.0 Final Exam (ENSA)

Passing the CCNA 3 v7.0 Final Exam for Enterprise Networking, Security, and Automation (ENSA) requires a comprehensive understanding of advanced networking concepts, including OSPF, network security, WAN technologies, QoS, and network automation. This final exam tests your ability to configure, verify, and troubleshoot complex enterprise networks.

Why the ENSA Final Exam Matters for Your Networking Career

The CCNA 3 v7.0 Final Exam is the culmination of the Enterprise Networking, Security, and Automation course. It validates your knowledge of OSPF routing, access control lists (ACLs), Network Address Translation (NAT), VPNs, IPsec, Quality of Service (QoS), and network automation. Passing this exam demonstrates your readiness to design, implement, and manage enterprise-grade networks—skills that are highly valued by employers in the networking industry.

Key Topics Covered in the Final Exam

Our verified answers address common exam questions on:

Many questions present a network topology and ask you to identify the correct configuration, troubleshoot issues, or select the best solution. Understanding the interplay between different technologies is critical for success.

Common Pitfalls to Avoid

Students often confuse standard and extended ACLs – standard ACLs filter only on source IP, while extended ACLs can filter on source/destination IP, protocol, and port. Another common mistake is mixing up NAT address types – inside local vs. inside global, outside local vs. outside global. Also, remember that OSPF DR/BDR election is based on priority (highest wins) and then router ID.

When practicing with our answers, avoid memorizing letter choices (A, B, C, D). Cisco often reorders options. Focus on the concept behind each correct answer. For example, instead of remembering "option B is the correct NAT type", learn the difference between static NAT, dynamic NAT, and PAT.

Study Strategies That Work

To retain this material long-term, combine our exam answers with hands-on practice. Use Packet Tracer to configure OSPF, ACLs, NAT, and VPNs. Set up a site-to-site VPN between two routers. Implement QoS policies and verify traffic prioritization. This practical approach cements the theory from the ENSA curriculum.

We also recommend creating flashcards for key terms: OSPF, DR, BDR, ACL, NAT, PAT, VPN, IPsec, GRE, DMVPN, QoS, CoS, DSCP, JSON, XML, YAML, SDN, hypervisor, and cloud computing. Quiz yourself daily until you can define each term without hesitation.

How to Use This Answer Page Effectively

Our goal at CoursMooc.com is to provide accurate, up-to-date answers for the latest CCNA v7 curriculum. For each question, we include an explanation—not just the correct choice. Read those explanations carefully. If you find a concept unclear, refer to the official Cisco NetAcad course materials or our additional tutorials linked below.

We regularly update this page to match any changes in the exam. If you notice discrepancies, please let us know through the comments. Your feedback helps other learners succeed.

What's Next After the ENSA Final Exam?

After completing the CCNA 3 v7.0 Final Exam, you have completed the full CCNA v7 curriculum (CCNA 1, 2, and 3). The next step is to prepare for the official CCNA 200-301 certification exam, which covers a broad range of networking topics. You can also explore more advanced certifications like CCNP or specialized tracks in security, wireless, or data center.

Final Tips for Exam Day

Before starting the real exam:

Remember: The CCNA v7 curriculum emphasizes practical troubleshooting. If you can explain why a NAT translation fails or why an OSPF neighbor won't form, you're ready. Use our answers to verify your thinking, then reinforce with simulation tools. Good luck on your exam – and on your journey to networking expertise.