Implementing Cisco Network Security (IINS, legacy) — Question 81

If a switch receives a superior BPDU and goes directly into a blocked state, what mechanism must be in use?

Answer options

• A. root guard
• B. EtherChannel guard
• C. loop guard
• D. BPDU guard

Correct answer: A

Explanation

The correct answer is root guard because it is designed to prevent a port from becoming a root port when a superior BPDU is received, thus placing the port in a blocked state. EtherChannel guard, loop guard, and BPDU guard serve different purposes and do not specifically cause a switch to block a port due to a superior BPDU.