Designing Cisco Enterprise Networks (ENSLD) — Question 198

Which function do reverse path forwarding mechanisms perform in a multicast deployment?

Answer options

• A. They send PIM prune message toward multicast sources.
• B. They prevent loops and duplicate packets.
• C. They eliminate overlapping multicast addresses.
• D. They notify the upstream router of multicast traffic.

Correct answer: B

Explanation

The correct answer is B because reverse path forwarding mechanisms are designed to prevent routing loops and eliminate duplicate packets in multicast traffic. Options A, C, and D do not accurately represent the primary function of reverse path forwarding, which is focused on maintaining a loop-free environment rather than addressing source notifications or address conflicts.