Network Security
Course Description
Every connection is a potential vulnerability. This course from Cisco Networking Academy teaches you how to secure network infrastructure and protect data as it travels across networks. You'll learn the fundamental principles of network security: confidentiality, integrity, and availability (the CIA triad).
The course covers the full range of network security topics: securing network devices, implementing firewalls, configuring Virtual Private Networks (VPNs), enforcing access control, and monitoring for threats. You'll get hands-on experience in virtual labs, configuring security features on routers and switches, and analyzing network traffic for signs of attack.
This free, self-paced course takes about 30 hours to complete. It's ideal for networking students, IT professionals, and anyone preparing for the CCNA Security certification. Upon completion, you'll earn an official Cisco digital badge.
Course Provider
Provider: Cisco Networking Academy, a global leader in IT and networking education.
Platform: Cisco NetAcad online platform – fully online, self-paced, with integrated virtual labs.
Accreditation: This course aligns with industry standards for network security and is excellent preparation for Cisco CCNA Security, CompTIA Security+, and other certifications.
Course Syllabus (Key Modules)
Learning Objectives
- Understand core network security principles (CIA triad, risk management).
- Harden network devices (routers, switches) against attacks.
- Configure firewalls and access control lists (ACLs) to filter traffic.
- Implement VPNs (IPsec, SSL) to secure data in transit.
- Set up network monitoring and basic intrusion detection.
- Apply cryptography (encryption, hashing, PKI) to protect network communications.
- Earn a Cisco digital badge demonstrating network security skills.
Course Prerequisites
Technical: Strong understanding of networking fundamentals (TCP/IP, routing, switching). You should be comfortable configuring basic router and switch settings. Prior completion of Cisco's Networking Basics or CCNA-level knowledge is highly recommended.
Recommended prior courses: Networking Basics, CCNA-level networking, or equivalent experience.
Who should take this: Network administrators, security analysts, IT professionals, and anyone preparing for CCNA Security or other security certifications.
User Reviews
"I took this course as part of my CCNA Security preparation, and it was invaluable. The module on VPNs alone was worth the time. The virtual labs let me configure IPsec tunnels and test them without needing real hardware. The explanations of AAA and 802.1X were also very clear. Highly recommended for anyone serious about network security."
"Solid course, but be prepared for a significant time commitment. 30 hours is accurate if you do the labs thoroughly. The content is up-to-date and practical. I particularly appreciated the section on securing network devices—it's something many courses overlook. The Cisco badge is a nice credential for my LinkedIn."
"I'm a network admin moving into a security role, and this course bridged the gap perfectly. The cryptography module demystified PKI and digital signatures. The firewall labs were excellent. This course won't make you a security expert overnight, but it gives you a rock-solid foundation. And it's free. Thank you Cisco."
Based on 2,300+ ratings on Cisco NetAcad.
💡 Final Thoughts
Network security is the foundation of cybersecurity. If you don't secure the network, nothing else matters. This Cisco course gives you that foundation. It's a serious, 30-hour commitment, but you'll come away with real skills: configuring firewalls, implementing VPNs, hardening routers and switches, and understanding the cryptography that protects data in transit. The course assumes you already know networking basics (routing, switching, IP addressing), so complete those first. But if you're ready, this free course is an excellent way to build enterprise-level network security skills. The Cisco badge is credible, but the real value is the ability to secure real networks. Strongly recommended for network admins and aspiring security professionals.
Network Security (Cisco) – FAQ
Is this course really free?
Yes, completely free. Cisco Networking Academy offers this course at no cost. You just need a free NetAcad account.
Do I need prior experience?
Yes. This is an intermediate-to-advanced course. You need a strong understanding of networking (TCP/IP, routing, switching). Take Networking Basics or a CCNA-level course first.
How long does the course take?
The course is self-paced and takes approximately 30 hours. Plan to spend several weeks if you study part-time.
Will I receive a certificate or badge?
Yes, upon passing the final exam, you'll earn an official Cisco digital badge. You can share it on LinkedIn and other platforms.
How does this differ from Network Defense?
Network Defense focuses on firewalls, IDS/IPS, and security monitoring. Network Security is broader, covering device hardening, VPNs, cryptography, and access control. Both are valuable; take both if you can.
Does this prepare me for the CCNA Security exam?
Yes, this course covers many of the topics on the CCNA Security exam. It's an excellent study resource, but you may need additional materials to fully prepare.