Free CCNA Security Fundamentals Practice Test 2026 — Cisco 200-301 Questions

This free Cisco CCNA Security Fundamentals practice test covers security concepts, device hardening, AAA, ACLs, port security, DHCP snooping, dynamic ARP inspection, VPN basics, and wireless security for the CCNA exam. Each question includes a detailed explanation — perfect for Cisco CCNA 200-301 exam prep.

Key Topics in CCNA Security Fundamentals

6 Free CCNA Security Fundamentals Practice Questions with Answers

Sample Question 1 — Security Fundamentals

What type of attack involves sending packets with a spoofed source IP address that matches the destination IP address?

  1. A. Man-in-the-middle
  2. B. Land attack (Correct answer)
  3. C. Smurf attack
  4. D. SYN flood

Correct answer: B

Explanation: A Land attack involves sending packets where the source and destination IP addresses are the same as the target host. This can cause the target system to reply to itself, potentially causing a denial of service.

Sample Question 2 — Security Fundamentals

Which command enables SSH version 2 on a Cisco router?

  1. A. ip ssh version 2 (Correct answer)
  2. B. ssh version 2
  3. C. ip ssh v2
  4. D. enable ssh v2

Correct answer: A

Explanation: The command "ip ssh version 2" enables SSH version 2 on Cisco devices. SSHv2 is more secure than SSHv1 and is the recommended version for secure remote access.

Sample Question 3 — Security Fundamentals

A network administrator notices unauthorized access attempts from a specific IP address to the company's web server. Which security mechanism would be MOST effective in preventing future attempts from this IP address?

  1. A. Implementing port security on the web server.
  2. B. Configuring an access control list (ACL) to deny traffic from the IP address. (Correct answer)
  3. C. Enabling SNMP traps on the web server.
  4. D. Using DHCP snooping to monitor the IP address.

Correct answer: B

Explanation: An ACL is the most effective solution. It allows granular control over network traffic based on source and destination IP addresses, ports, and other criteria. It directly blocks the malicious IP address from accessing the web server. Port security is useful for limiting the number of MAC addresses allowed on a port, but doesn't address the specific IP address. SNMP traps are for monitoring, not prevention. DHCP snooping prevents rogue DHCP servers, not malicious IP addresses.

Sample Question 4 — Security Fundamentals

A company wants to secure remote access to its network for its employees. Which solution offers the STRONGEST security posture?

  1. A. Telnet
  2. B. SSH (Correct answer)
  3. C. HTTP
  4. D. FTP

Correct answer: B

Explanation: SSH (Secure Shell) provides encrypted communication, protecting usernames, passwords, and data in transit. Telnet transmits data in plain text, making it highly vulnerable. HTTP and FTP are not designed for secure remote access.

Sample Question 5 — Security Fundamentals

What is the primary purpose of 802.1X authentication in a network security context?

  1. A. To encrypt network traffic.
  2. B. To control access to network resources based on user identity. (Correct answer)
  3. C. To prevent DHCP server spoofing.
  4. D. To manage network devices remotely.

Correct answer: B

Explanation: 802.1X is a port-based network access control protocol. It authenticates users before granting network access, ensuring only authorized devices and users can connect to the network.

Sample Question 6 — Security Fundamentals

A network administrator needs to restrict access to a specific server only from a predefined set of IP addresses. Which security mechanism is BEST suited for this?

  1. A. RADIUS
  2. B. TACACS+
  3. C. Access Control List (ACL) (Correct answer)
  4. D. Port Security

Correct answer: C

Explanation: ACLs allow granular control of network traffic based on source and destination IP addresses. They are ideal for restricting access to a server from specific IP addresses. RADIUS and TACACS+ are authentication and authorization protocols, while Port Security limits the number of MAC addresses on a port.

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