Implementing Cisco Network Security (IINS, legacy) — Question 60

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

Answer options

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

Correct answer:

Explanation

The correct answer is BPDU guard, which is designed to protect the network by placing a port in a blocked state when a superior BPDU is received. Loop guard is used to prevent loops by blocking ports that stop receiving BPDUs, while root guard prevents a port from becoming a root port if a superior BPDU is received.