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Security Fundamentals

Securing Cisco networks: the access layer first, then device access, access control lists, VPNs and wireless security.

Intermediate · 8 lessons

Security is 15% of the CCNA exam. This course starts at Layer 2, where many attacks happen because switches trust what they hear by default, and will grow to cover passwords and SSH, ACLs, AAA, VPNs and wireless security. Lessons still being written show as “soon” in the course menu.

What's in this course

1. Layer 2 Security

Protecting the access layer from spoofing and rogue devices.

  1. 1.1 Port security
  2. 1.2 DHCP snooping
  3. 1.3 ARP security

2. Device Access

Controlling who can log in to network devices, and what they can do.

  1. 2.1 Passwords, local users and SSH
  2. 2.2 AAA: RADIUS and TACACS+

3. Access Control Lists

Filtering traffic on routers with ACLs.

  1. 3.1 Standard ACLs
  2. 3.2 Extended and named ACLs

4. VPNs

Protecting traffic that crosses untrusted networks.

  1. 4.1 Site-to-site and remote-access VPNs

Start the first lesson →