Implementing Cisco IP Switched Networks (CCNP SWITCH, legacy) — Question 28

Which two statements about CDP are true? (Choose two.)

Answer options

• A. It can be disabled only at the interface level.
• B. Devices with Cisco Discovery Protocol configured send advertisement messages to a multicast address on a periodic basis
• C. It is disabled when switches have mismatched native VLANs
• D. Devices with Cisco Discovery Protocol configured send advertisement messages to a broadcast address on a periodic basis.
• E. VTP relies on Cisco Discovery Protocol to carry VTP domain information

Correct answer: B, C

Explanation

Option B is correct because CDP indeed sends advertisement messages to a multicast address periodically. Option C is also correct as CDP will be disabled in the case of mismatched native VLANs. Options A and D are incorrect; CDP can be disabled at different levels, not just the interface, and it uses multicast, not broadcast, for advertisement messages.