Designing Cisco Enterprise Networks (ENSLD) — Question 172

In a multicast network, which condition must be met for an RPF check to be performed on the RP address?

Answer options

• A. The PIM router or multilayer switch has a source-tree state.
• B. The PIM DM device receives a multicast packet and has no directly connected members.
• C. The PIM DM device receives a multicast packet and has no directly connected PIM neighbor.
• D. The PIM router or multilayer switch has a shared-tree state.

Correct answer: D

Explanation

The correct answer is D because an RPF check is initiated when the PIM router or multilayer switch is in a shared-tree state, allowing it to validate the source of the multicast packet. Options A, B, and C do not represent the conditions under which the RPF check specifically applies to the RP address, as they pertain to different states or scenarios that do not trigger the RPF process.