CCNA 3 v7 Modules 6-8: WAN Concepts Exam Answers

Checkpoint Exam: WAN Concepts. This comprehensive study guide covers Modules 6-8 of the CCNA3 Enterprise Networking, Security, and Automation v7.0 (ENSA), including WAN architectures, NAT, VPNs, and IPsec.

CCNA v7.0 Exam Answers

1. Which two statements accurately describe an advantage or a disadvantage when deploying NAT for IPv4 in a network? (Choose two.)

  • A. NAT improves packet handling.
  • B. NAT adds authentication capability to IPv4.
  • C. NAT will impact negatively on switch performance.
  • D. NAT causes routing tables to include more information.
  • E. NAT provides a solution to slow down the IPv4 address depletion.
  • F. NAT introduces problems for some applications that require end-to-end connectivity.

Explanation: Topic 6.3.1 – Network Address Translation (NAT) is a technology that is implemented within IPv4 networks. One application of NAT is to use private IP addresses inside a network and use NAT to share a few public IP addresses for many internal hosts. In this way it provides a solution to slow down the IPv4 address depletion. However, since NAT hides the actual IP addresses that are used by end devices, it may cause problems for some applications that require end-to-end connectivity.

2. A network administrator wants to examine the active NAT translations on a border router. Which command would perform the task?

  • A. Router# show ip nat translations
  • B. Router# show ip nat statistics
  • C. Router# clear ip nat translations
  • D. Router# debug ip nat translations

Explanation: Topic 6.4.4 – show ip nat translations displays active NAT translations.

3. What are two tasks to perform when configuring static NAT? (Choose two.)

  • A. Configure a NAT pool.
  • B. Create a mapping between the inside local and outside local addresses.
  • C. Identify the participating interfaces as inside or outside interfaces.
  • D. Define the inside global address on the server
  • E. Define the outside global address.

Explanation: Topic 6.4.2 – There is no server involved when using NAT. The outside global address will change for each destination the inside host will try to reach. A NAT pool is only configured for dynamic NAT implementations.

4. What is a disadvantage of NAT?

  • A. There is no end-to-end addressing.
  • B. The router does not need to alter the checksum of the IPv4 packets.
  • C. The internal hosts have to use a single public IPv4 address for external communication.
  • D. The costs of readdressing hosts can be significant for a publicly addressed network.

Explanation: Topic 6.3.2 – NAT breaks end-to-end addressing.

5. Refer to the exhibit. From the perspective of R1, the NAT router, which address is the inside global address?

NAT topology
  • A. 192.168.0.10
  • B. 192.168.0.1
  • C. 209.165.200.225
  • D. 209.165.200.254

Explanation: Topic 6.1.4 – The inside global address is the public address of the NAT router's interface (209.165.200.225).

6. Refer to the exhibit. Given the commands as shown, how many hosts on the internal LAN off R1 can have simultaneous NAT translations on R1?

NAT commands
  • A. 244
  • B. 10
  • C. 1
  • D. 255

Explanation: Topic 6.2.1 – The NAT configuration on R1 is static NAT which translates a single inside IP address, 192.168.0.10 into a single public IP address, 209.165.200.255. If more hosts need translation, then a NAT pool of inside global address or overloading should be configured.

7. Refer to the exhibit. A network administrator has just configured address translation and is verifying the configuration. What three things can the administrator verify? (Choose three.)

NAT verification
  • A. A standard access list numbered 1 was used as part of the configuration process.
  • B. Three addresses from the NAT pool are being used by hosts.
  • C. Address translation is working.
  • D. One port on the router is not participating in the address translation.
  • E. The name of the NAT pool is refCount.
  • F. Two types of NAT are enabled.

Explanation: Topic 6.5.5 – The show ip nat statistics, show ip nat translations, and debug ip nat commands are useful in determining if NAT is working and and also useful in troubleshooting problems that are associated with NAT. NAT is working, as shown by the hits and misses count. Because there are four misses, a problem might be evident. The standard access list numbered 1 is being used and the translation pool is named NAT as evidenced by the last line of the output. Both static NAT and NAT overload are used as seen in the Total translations line.

8. Refer to the exhibit. NAT is configured on RT1 and RT2. The PC is sending a request to the web server. What IPv4 address is the source IP address in the packet between RT2 and the web server?

NAT with two routers
  • A. 192.168.1.5
  • B. 203.0.113.10
  • C. 172.16.1.254
  • D. 172.16.1.10
  • E. 209.165.200.245
  • F. 192.0.2.2

Explanation: Topic 6.1.4 – Because the packet is between RT2 and the web server, the source IP address is the inside global address of PC, 209.165.200.245.

9. Refer to the exhibit. Based on the output that is shown, what type of NAT has been implemented?

NAT output
  • A. dynamic NAT with a pool of two public IP addresses
  • B. PAT using an external interface
  • C. static NAT with a NAT pool
  • D. static NAT with one entry

Explanation: Topic 6.6.6 – The output shows that there are two inside global addresses that are the same but that have different port numbers. The only time port numbers are displayed is when PAT is being used. The same output would be indicative of PAT that uses an address pool. PAT with an address pool is appropriate when more than 4,000 simultaneous translations are needed by the company.

10. Refer to the exhibit. From the perspective of users behind the NAT router, what type of NAT address is 209.165.201.1?

NAT address types
  • A. inside global
  • B. outside global
  • C. outside local
  • D. inside local

Explanation: Topic 6.1.4 – From the perspective of users behind NAT, inside global addresses are used by external users to reach internal hosts. Inside local addresses are the addresses assigned to internal hosts. Outside global addresses are the addresses of destinations on the external network. Outside local addresses are the actual private addresses of destination hosts behind other NAT devices.

11. Refer to the exhibit. Static NAT is being configured to allow PC 1 access to the web server on the internal network. What two addresses are needed in place of A and B to complete the static NAT configuration? (Choose two.)

Static NAT config
  • A. A = 209.165.201.2
  • B. A = 10.1.0.13
  • C. B = 209.165.201.7
  • D. B = 10.0.254.5
  • E. B = 209.165.201.1

Explanation: Topic 6.4.2 – Static NAT is a one-to-one mapping between an inside local address and an inside global address. By using static NAT, external devices can initiate connections to internal devices by using the inside global addresses. The NAT devices will translate the inside global address to the inside local address of the target host.

12. What is the purpose of the overload keyword in the ip nat inside source list 1 pool NAT_POOL overload command?

  • A. It allows many inside hosts to share one or a few inside global addresses.
  • B. It allows a list of internal hosts to communicate with a specific group of external hosts.
  • C. It allows external hosts to initiate sessions with internal hosts.
  • D. It allows a pool of inside global addresses to be used by internal hosts.

Explanation: Topic 6.2.3 – Dynamic NAT uses a pool of inside global addresses that are assigned to outgoing sessions. If there are more internal hosts than public addresses in the pool, then an administrator can enable port address translation with the addition of the overload keyword. With port address translation, many internal hosts can share a single inside global address because the NAT device will track the individual sessions by Layer 4 port number.

13. Refer to the exhibit. Which source address is being used by router R1 for packets being forwarded to the Internet?

NAT source address
  • A. 10.6.15.2
  • B. 209.165.202.141
  • C. 198.51.100.3
  • D. 209.165.200.225

Explanation: Topic 6.1.4 – The source address for packets forwarded by the router to the Internet will be the inside global address of 209.165.200.225. This is the address that the internal addresses from the 10.6.15.0 network will be translated to by NAT.

14. Refer to the exhibit. The NAT configuration applied to the router is as follows:

ERtr(config)# access-list 1 permit 10.0.0.0 0.255.255.255
ERtr(config)# ip nat pool corp 209.165.201.6 209.165.201.30 netmask 255.255.255.224
ERtr(config)# ip nat inside source list 1 pool corp overload
ERtr(config)# ip nat inside source static 10.10.10.55 209.165.201.4
ERtr(config)# interface gigabitethernet 0/0
ERtr(config-if)# ip nat inside
ERtr(config-if)# interface serial 0/0/0
ERtr(config-if)# ip nat outside

Based on the configuration and the output shown, what can be determined about the NAT status within the organization?

NAT status
  • A. Static NAT is working, but dynamic NAT is not.
  • B. Dynamic NAT is working, but static NAT is not.
  • C. Not enough information is given to determine if both static and dynamic NAT are working.
  • D. NAT is working.

Explanation: Topic 6.5.5 – There is not enough information given because the router might not be attached to the network yet, the interfaces might not have IP addresses assigned yet, or the command could have been issued in the middle of the night. The output does match the given configuration, so no typographical errors were made when the NAT commands were entered.

15. Which situation describes data transmissions over a WAN connection?

  • A. A network administrator in the office remotely accesses a web server that is located in the data center at the edge of the campus.
  • B. A manager sends an email to all employees in the department with offices that are located in several buildings.
  • C. An employee prints a file through a networked printer that is located in another building.
  • D. An employee shares a database file with a co-worker who is located in a branch office on the other side of the city.

Explanation: Topic 7.1.1 – When two offices across a city are communicating , it is most likely that the data transmissions are over some type of WAN connection. Data communications within a campus are typically over LAN connections.

16. Which two technologies are categorized as private WAN infrastructures? (Choose two.)

  • A. Frame Relay
  • B. VPN
  • C. MetroE
  • D. DSL
  • E. cable

Explanation: Topic 7.2.2 – Private WAN technologies include leased lines, dialup, ISDN, Frame Relay, ATM, Ethernet WAN (an example is MetroE), MPLS, and VSAT.

17. Which network scenario will require the use of a WAN?

  • A. Employees need to connect to the corporate email server through a VPN while traveling.
  • B. Employees need to access web pages that are hosted on the corporate web servers in the DMZ within their building.
  • C. Employee workstations need to obtain dynamically assigned IP addresses.
  • D. Employees in the branch office need to share files with the headquarters office that is located in a separate building on the same campus network.

Explanation: Topic 7.1.1 – When traveling employees need to connect to a corporate email server through a WAN connection, the VPN will create a secure tunnel between an employee laptop and the corporate network over the WAN connection. Obtaining dynamic IP addresses through DHCP is a function of LAN communication. Sharing files among separate buildings on a corporate campus is accomplished through the LAN infrastructure. A DMZ is a protected network inside the corporate LAN infrastructure.

18. What are two hashing algorithms used with IPsec AH to guarantee authenticity? (Choose two.)

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

Explanation: Topic 8.3.5 – 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 and authenticity) are MD5 and SHA.

19. What two algorithms can be part of an IPsec policy to provide encryption and hashing to protect interesting traffic? (Choose two.)

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

Explanation: Topic 8.3.2 – 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 and authenticity) are MD5 and SHA.

20. Which VPN solution allows the use of a web browser to establish a secure, remote-access VPN tunnel to the ASA?

  • A. client-based SSL
  • B. site-to-site using an ACL
  • C. clientless SSL
  • D. site-to-site using a preshared key

Explanation: Topic 8.2.1 – When a web browser is used to securely access the corporate network, the browser must use a secure version of HTTP to provide SSL encryption. A VPN client is not required to be installed on the remote host, so a clientless SSL connection is used.

21. Which IPsec security function provides assurance that the data received via a VPN has not been modified in transit?

  • A. integrity
  • B. authentication
  • C. confidentiality
  • D. secure key exchange

Explanation: Topic 8.3.5 – Integrity is a function of IPsec and ensures data arrives unchanged at the destination through the use of a hash algorithm. Confidentiality is a function of IPsec and utilizes encryption to protect data transfers with a key. Authentication is a function of IPsec and provides specific access to users and devices with valid authentication factors. Secure key exchange is a function of IPsec and allows two peers to maintain their private key confidentiality while sharing their public key.

22. Which two types of VPNs are examples of enterprise-managed remote access VPNs? (Choose two.)

  • A. clientless SSL VPN
  • B. client-based IPsec VPN
  • C. IPsec VPN
  • D. IPsec Virtual Tunnel Interface VPN
  • E. GRE over IPsec VPN

Explanation: Topic 8.1.4 – Remote access VPNs include client-based IPsec and clientless SSL.

23. Which is a requirement of a site-to-site VPN?

  • A. It requires hosts to use VPN client software to encapsulate traffic.
  • B. It requires the placement of a VPN server at the edge of the company network.
  • C. It requires a VPN gateway at each end of the tunnel to encrypt and decrypt traffic.
  • D. It requires a client/server architecture.

Explanation: Topic 8.2.3 – Site-to-site VPNs are static and are used to connect entire networks. Hosts have no knowledge of the VPN and send TCP/IP traffic to VPN gateways. The VPN gateway is responsible for encapsulating the traffic and forwarding it through the VPN tunnel to a peer gateway at the other end which decapsulates the traffic.

24. What is the function of the Diffie-Hellman algorithm within the IPsec framework?

  • A. guarantees message integrity
  • B. allows peers to exchange shared keys
  • C. provides authentication
  • D. provides strong data encryption

Explanation: Topic 8.3.7 – Site-to-site VPNs are static and are used to connect entire networks. Hosts have no knowledge of the VPN and send TCP/IP traffic to VPN gateways. The VPN gateway is responsible for encapsulating the traffic and forwarding it through the VPN tunnel to a peer gateway at the other end which decapsulates the traffic.

25. What does NAT overloading use to track multiple internal hosts that use one inside global address?

  • A. port numbers
  • B. IP addresses
  • C. autonomous system numbers
  • D. MAC addresses

Explanation: Topic 6.2.3 – NAT overloading, also known as Port Address Translation (PAT), uses port numbers to differentiate between multiple internal hosts.

26. What type of address is 192.168.7.98?

  • A. public
  • B. private

Explanation: Topic 6.1.1 – 192.168.0.0/16 is a private address range.

27. Refer to the exhibit. R1 is configured for static NAT. What IP address will Internet hosts use to reach PC1?

Static NAT
  • A. 192.168.0.1
  • B. 192.168.0.10
  • C. 209.165.201.1
  • D. 209.165.200.225

Explanation: Topic 6.1.4 – In static NAT a single inside local address, in this case 192.168.0.10, will be mapped to a single inside global address, in this case 209.165.200.225. Internet hosts will send packets to PC1 and use as a destination address the inside global address 209.165.200.225.

28. Which type of VPN uses the public key infrastructure and digital certificates?

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

Explanation: Topic 8.2.2 – SSL VPNs use PKI and digital certificates.

29. Which two WAN infrastructure services are examples of private connections? (Choose two.)

  • A. cable
  • B. DSL
  • C. Frame Relay
  • D. T1/E1
  • E. wireless

Explanation: Topic 7.3.1 – Private WANs can use T1/E1, T3/E3, PSTN, ISDN, Metro Ethernet, MPLS, Frame Relay, ATM, or VSAT technology.

30. Which two statements about the relationship between LANs and WANs are true? (Choose two.)

  • A. Both LANs and WANs connect end devices.
  • B. WANs are typically operated through multiple ISPs, but LANs are typically operated by single organizations or individuals.
  • C. WANs must be publicly-owned, but LANs can be owned by either public or private entities.
  • D. WANs connect LANs at slower speed bandwidth than LANs connect their internal end devices.
  • E. LANs connect multiple WANs together.

Explanation: Topic 7.1.1 – Private WANs can use T1/E1, T3/E3, PSTN, ISDN, Metro Ethernet, MPLS, Frame Relay, ATM, or VSAT technology.

31. Which statement describes an important characteristic of a site-to-site VPN?

  • A. It must be statically set up.
  • B. It is ideally suited for use by mobile workers.
  • C. It requires using a VPN client on the host PC.
  • D. After the initial connection is established, it can dynamically change connection information.
  • E. It is commonly implemented over dialup and cable modem networks.

Explanation: Topic 8.1.3 – A site-to-site VPN is created between the network devices of two separate networks. The VPN is static and stays established. The internal hosts of the two networks have no knowledge of the VPN.

32. How is "tunneling" accomplished in a VPN?

  • A. New headers from one or more VPN protocols encapsulate the original packets.
  • B. All packets between two hosts are assigned to a single physical medium to ensure that the packets are kept private.
  • C. Packets are disguised to look like other types of traffic so that they will be ignored by potential attackers.
  • D. A dedicated circuit is established between the source and destination devices for the duration of the connection.

Explanation: Topic 8.2.4 – A site-to-site VPN is created between the network devices of two separate networks. The VPN is static and stays established. The internal hosts of the two networks have no knowledge of the VPN.

33. Which statement describes a VPN?

  • A. VPNs use open source virtualization software to create the tunnel through the Internet.
  • B. VPNs use logical connections to create public networks 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: Topic 8.1.1 – A site-to-site VPN is created between the network devices of two separate networks. The VPN is static and stays established. The internal hosts of the two networks have no knowledge of the VPN.

34. Open the PT Activity. Perform the tasks in the activity instructions and then answer the question. What problem is causing PC-A to be unable to communicate with the Internet?

PT activity
Icon

Modules 6 - 8: WAN Concepts - Packet Tracer 72.97 KB 10578 downloads

Download
  • A. The ip nat inside source command refers to the wrong interface.
  • B. The NAT interfaces are not correctly assigned.
  • C. The static route should not reference the interface, but the outside address instead.
  • D. The access list used in the NAT process is referencing the wrong subnet.
  • E. This router should be configured to use static NAT instead of PAT.

Explanation: Topic 6.5.5 – A site-to-site VPN is created between the network devices of two separate networks. The VPN is static and stays established. The internal hosts of the two networks have no knowledge of the VPN.

35. What type of address is 64.100.190.189?

  • A. public
  • B. private

Explanation: Topic 6.1.1 – A site-to-site VPN is created between the network devices of two separate networks. The VPN is static and stays established. The internal hosts of the two networks have no knowledge of the VPN.

36. 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: Topic 8.2.6 – The output of show ip nat statistics shows that the inside interface is FastEthernet0/0 but that no interface has been designated as the outside interface. This can be fixed by adding the command ip nat outside to interface Serial0/0/0.

37. Match the scenario to the WAN solution. (Not all options are used.)

WAN solutions matching

Explanation: Topic 7.3.2 – Match scenarios to appropriate WAN solutions.

38. Refer to the exhibit. The PC is sending a packet to the Server on the remote network. Router R1 is performing NAT overload. From the perspective of the PC, match the NAT address type with the correct IP address. (Not all options are used.)

NAT overload matching NAT address types

Explanation: Topic 6.1.4 – The inside local address is the private IP address of the source or the PC in this instance. The inside global address is the translated address of the source or the address as seen by the outside device. Since the PC is using the outside address of the R1 router, the inside global address is 192.0.2.1. The outside addressing is simply the address of the server or 203.0.113.5.

39. Refer to the exhibit. What has to be done in order to complete the static NAT configuration on R1?

Static NAT config
  • A. Interface Fa0/0 should be configured with the command no ip nat inside.
  • B. Interface S0/0/0 should be configured with the command ip nat outside.
  • C. R1 should be configured with the command ip nat inside source static 209.165.200.200 192.168.11.11.
  • D. R1 should be configured with the command ip nat inside source static 209.165.200.1 192.168.11.11.

Explanation: Topic 6.4.2 – In order for NAT translations to work properly, both an inside and outside interface must be configured for NAT translation on the router.

40. In NAT terms, what address type refers to the globally routable IPv4 address of a destination host on the Internet?

  • A. outside global
  • B. inside global
  • C. outside local
  • D. inside local

Explanation: Topic 6.1.4 – In order for NAT translations to work properly, both an inside and outside interface must be configured for NAT translation on the router.

41. Refer to the exhibit. Which two statements are correct based on the output as shown in the exhibit? (Choose two.)

NAT output
  • A. The output is the result of the show ip nat translations command.
  • B. The host with the address 209.165.200.235 will respond to requests by using a source address of 192.168.10.10.
  • C. The output is the result of the show ip nat statistics command.
  • D. Traffic with the destination address of a public web server will be sourced from the IP of 192.168.1.10.
  • E. The host with the address 209.165.200.235 will respond to requests by using a source address of 209.165.200.235.

Explanation: Topic 6.4.4 – The output displayed in the exhibit is the result of the show ip nat translations command. Static NAT entries are always present in the NAT table, while dynamic entries will eventually time out.

42. Which circumstance would result in an enterprise deciding to implement a corporate WAN?

  • A. when the enterprise decides to secure its corporate LAN
  • B. when its employees become distributed across many branch locations
  • C. when the number of employees exceeds the capacity of the LAN
  • D. when the network will span multiple buildings

Explanation: Topic 7.1.5 – WANs cover a greater geographic area than LANs do, so having employees distributed across many locations would require the implementation of WAN technologies to connect those locations. Customers will access corporate web services via a public WAN that is implemented by a service provider, not by the enterprise itself. When employee numbers grow, the LAN has to expand as well. A WAN is not required unless the employees are in remote locations. LAN security is not related to the decision to implement a WAN.

43. What is the function of the Hashed Message Authentication Code (HMAC) algorithm in setting up an IPsec VPN?

  • A. protects IPsec keys during session negotiation
  • B. authenticates the IPsec peers
  • C. creates a secure channel for key negotiation
  • D. guarantees message integrity

Explanation: Topic 8.3.5 – The IPsec framework uses various protocols and algorithms to provide data confidentiality, data integrity, authentication, and secure key exchange. The Hashed Message Authentication Code (HMAC) is a data integrity algorithm that uses a hash value to guarantee the integrity of a message.

44. What algorithm is used with IPsec to provide data confidentiality?

  • A. Diffie-Hellman
  • B. SHA
  • C. MD5
  • D. RSA
  • E. AES

Explanation: Topic 8.3.4 – The IPsec framework uses various protocols and algorithms to provide data confidentiality, data integrity, authentication, and secure key exchange. Two popular algorithms that are 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 that is used for key exchange. RSA is an algorithm that is used for authentication.

45. Which two technologies provide enterprise-managed VPN solutions? (Choose two.)

  • A. remote access VPN
  • B. Frame Relay
  • C. Layer 2 MPLS VPN
  • D. site-to-site VPN
  • E. Layer 3 MPLS VPN

Explanation: Topic 8.1.4 – Enterprise-managed VPNs include site-to-site and remote access VPNs.

46. Which two end points can be on the other side of an ASA site-to-site VPN? (Choose two.)

  • A. DSL switch
  • B. router
  • C. another ASA
  • D. multilayer switch
  • E. Frame Relay switch

Explanation: Topic 8.1.1 – In a site-to-site VPN, end hosts send and receive normal unencrypted TCP/IP traffic through a VPN terminating device, typically called a VPN gateway. A VPN gateway device could be a router or a firewall. A Cisco Adaptive Security Appliance (ASA) is a standalone firewall device that combines firewall, VPN concentrator, and intrusion prevention functionality into one software image.

47. Refer to the exhibit. A network administrator is viewing the output from the command show ip nat translations. Which statement correctly describes the NAT translation that is occurring on router RT2?

NAT translations
  • A. The traffic from a source IPv4 address of 192.168.254.253 is being translated to 192.0.2.88 by means of static NAT.
  • B. The traffic from a source IPv4 address of 192.0.2.88 is being translated by router RT2 to reach a destination IPv4 address of 192.168.254.253.
  • C. The traffic from a source IPv4 public address that originates traffic on the internet would be able to reach private internal IPv4 addresses.
  • D. The traffic from a source IPv4 address of 192.168.2.20 is being translated by router RT2 to reach a destination IPv4 address of 192.0.2.254.

Explanation: Topic 6.4.4 – Because no outside local or outside global address is referenced, the traffic from a source IPv4 address of 192.168.254.253 is being translated to 192.0.2.88 by using static NAT. In the output from the command show ip nat translations, the inside local IP address of 192.168.2.20 is being translated into an outside IP address of 192.0.2.254 so that the traffic can cross the public network. A public IPv4 device can connect to the private IPv4 device 192.168.254.253 by targeting the destination IPv4 address of 192.0.2.88.

48. What type of address is 10.100.126.126?

  • A. private
  • B. public

Explanation: Topic 6.1.1 – 10.0.0.0/8 is a private address range.

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

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

Explanation: Topic 8.2.2 – 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.

50. Which two end points can be on the other side of an ASA site-to-site VPN configured using ASDM? (Choose two.)

  • A. DSL switch
  • B. ISR router
  • C. another ASA
  • D. multilayer switch
  • E. Frame Relay switch

Explanation: Topic 8.2.3 – ASDM supports creating an ASA site-to-site VPN between two ASAs or between an ASA and an ISR router.

51. Which protocol creates a virtual point-to-point connection to tunnel unencrypted traffic between Cisco routers from a variety of protocols?

  • A. IKE
  • B. IPsec
  • C. OSPF
  • D. GRE

Explanation: Topic 8.2.4 – ASDM supports creating an ASA site-to-site VPN between two ASAs or between an ASA and an ISR router.

52. What is a disadvantage when both sides of a communication use PAT?

  • A. End-to-end IPv4 traceability is lost.
  • B. The flexibility of connections to the Internet is reduced.
  • C. The security of the communication is negatively impacted.
  • D. Host IPv4 addressing is complicated.

Explanation: Topic 6.3.2 – With the use of NAT, especially PAT, end-to-end traceability is lost. This is because the host IP address in the packets during a communication is translated when it leaves and enters the network. With the use of NAT/PAT, both the flexibility of connections to the Internet and security are actually enhanced. Host IPv4 addressing is provided by DHCP and not related to NAT/PAT.

53. What two addresses are specified in a static NAT configuration?

  • A. the outside global and the outside local
  • B. the inside local and the outside global
  • C. the inside global and the outside local
  • D. the inside local and the inside global

Explanation: Topic 6.4.2 – Static NAT maps inside local to inside global.

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

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

Explanation: Topic 7.4.2 – Leased lines and Ethernet WAN are private WAN options.

55. What type of address is 128.107.240.239?

  • A. Public
  • B. Private

Explanation: Topic 6.1.1 – 128.107.240.239 is a public address.

56. Which type of VPN has both Layer 2 and Layer 3 implementations?

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

Explanation: Topic 8.2.7 – MPLS VPN has both Layer 2 and Layer 3 implementations.

57. Refer to the exhibit. A network administrator has configured R2 for PAT. Why is the configuration incorrect?

PAT configuration
  • A. NAT-POOL2 is bound to the wrong ACL
  • B. The ACL does not define the list of addresses to be translated.
  • C. The overload keyword should not have been applied.
  • D. The static NAT entry is missing

Explanation: Topic 6.5.2 – In the exhibit, NAT-POOL 2 is bound to ACL 100, but it should be bound to the configured ACL 1. This will cause PAT to fail. 100, but it should be bound to the configured ACL 1. This will cause PAT to fail.

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

WAN components

Explanation: Topic 7.2.3 – Match WAN components to their descriptions.

59. 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: Topic 8.2.4 – GRE over IPsec supports multicast and broadcast traffic.

60. Match the steps with the actions that are involved when an internal host with IP address 192.168.10.10 attempts to send a packet to and external server at the IP address 209.165.200.254 across a router R1 that running dynamic NAT. (Not all options are used.)

NAT steps matching

Explanation: Topic 6.5.3 – The correct order: Host sends packet → R1 checks NAT config → R1 determines translation needed → R1 selects global address → R1 replaces source address. The translation of the IP addresses from 209.65.200.254 to 192.168.10.10 will take place when the reply comes back from the server.

61. Which type of VPN involves passenger, carrier, and transport protocols?

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

Explanation: Topic 8.2.4 – The translation of the IP addresses from 209.65.200.254 to 192.168.10.10 will take place when the reply comes back from the server.

64. What type of address is 10.131.48.7?

  • A. Private
  • B. Public

Explanation: Topic 6.1.1 – 10.0.0.0/8 is private.

65. Which type of VPN supports multiple sites by applying configurations to virtual interfaces instead of physical interfaces?

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

Explanation: Topic 8.2.6 – An IPsec VTI is a newer IPsec VPN technology that simplifies the configuration required to support multiple sites and remote access. IPsec VTI configurations use virtual interfaces to send and receive IP unicast and multicast encrypted traffic. Therefore, routing protocols are automatically supported without requiring configuration of GRE tunnels.

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

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

Explanation: Topic 8.2.4 – GRE (nonsecure) is encapsulated by IPsec.

67. What type of address is 10.19.6.7?

  • A. private
  • B. public

Explanation: Topic 6.1.1 – 10.0.0.0/8 is private.

68. What type of address is 64.101.198.197?

  • A. public
  • B. private

Explanation: Topic 6.1.1 – 64.101.198.197 is a public address.

69. What type of address is 64.101.198.107?

  • A. public
  • B. private

Explanation: Topic 6.1.1 – 64.101.198.107 is a public address.

70. What type of address is 10.100.34.34?

  • A. private
  • B. public

Explanation: Topic 6.1.1 – 10.0.0.0/8 is private.

71. What type of address is 192.168.7.126?

  • A. Private
  • B. Public

Explanation: Topic 6.1.1 – 192.168.0.0/16 is private.

72. What type of address is 198.133.219.148?

  • A. Private
  • B. Public

Explanation: Topic 6.1.1 – 198.133.219.148 is a public address.

CCNA 3 Modules 9 - 12: Exams Answers

🚀 Ace Your CCNA Exam - Complete Study Pack!

Get 500+ exam-realistic questions, Packet Tracer labs, and detailed explanations.

📚 Download Full pack

Understanding WAN Concepts (Modules 6-8)

Passing the CCNA 3 v7 Modules 6-8 exam requires a solid grasp of WAN technologies, NAT, VPNs, and IPsec. These modules cover WAN architectures, Network Address Translation (NAT), Virtual Private Networks (VPNs), IPsec protocols, and WAN connectivity options – essential knowledge for any network professional.

Why Modules 6-8 Matter for Your Networking Career

Modules 6-8 focus on connecting enterprise networks across wide geographic areas. You learn how NAT conserves IPv4 addresses, how VPNs secure data over public networks, and how IPsec provides confidentiality, integrity, and authentication. Employers expect CCNA-certified professionals to understand NAT terminology, VPN types, IPsec components, and WAN technologies. Mastering these topics prepares you for advanced network design and security roles.

Key Topics Covered in the Exam

Our verified answers address common exam questions on:

Many questions present a network topology and ask you to identify NAT address types, correct VPN configuration, or troubleshooting steps. Understanding the encapsulation process and the role of each IPsec component is critical for success.

Common Pitfalls to Avoid

Students often confuse inside local and inside global addresses – inside local is the private address of the internal host, while inside global is the translated address seen on the outside network. Another common mistake is mixing up site-to-site and remote access VPNs – site-to-site connects entire networks, while remote access connects individual users. Also, remember that GRE does not encrypt traffic; it must be combined with IPsec for security.

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 static NAT, dynamic NAT, and PAT on routers. Set up a site-to-site VPN between two routers. Verify NAT translations and VPN tunnels with show commands. This practical approach cements the theory from Modules 6-8.

We also recommend creating flashcards for key terms: NAT, PAT, inside global, inside local, outside global, outside local, VPN, IPsec, AH, ESP, IKE, DH, SHA, MD5, AES, GRE, MPLS, Frame Relay, MetroE. 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 Modules 6-8?

After mastering WAN concepts, Modules 9-12 cover network optimization, monitoring, and troubleshooting. Modules 13-14 focus on emerging network technologies. Each step builds on the fundamentals you solidify here. By completing all CCNA 3 v7 exams (Modules 1-2, 3-5, 6-8, 9-12, 13-14), you earn the official "Enterprise Networking, Security, and Automation" badge – a stepping stone to the full CCNA certification.

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 a VPN tunnel won't establish, 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.