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

Which function do reverse path forwarding mechanisms perform in a multicast deployment?
A . They notify the upstream routerof multicast traffic.
B. They send PIM prune message toward multicast sources.
C. They eliminate overlapping multicast addresses
D. They prevent loops and duplicate packets.

Answer: D

Explanation:

Reverse path forwarding (RPF) mechanisms are used to prevent loops and duplicate packets in multicast deployments [1]. The RPF check verifies that all multicast traffic received on a router is sourced from the expected direction, ensuring that multicast traffic is not looped back in the network. The RPF check works by comparing the source IP address of a multicast packet with the routing table, and only forwarding it if it matches the expected entry.

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