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Question 258

What are two purposes of the RPF check in multicast routing? (Choose two.)

to ensure that multicast packets are forwarded if they arrived on the interface used to route traffic back to the source address

to ensure that multicast packets are forwarded if they arrived on the interface used to route traffic to the destination address

to ensure that multicast packets are dropped if they arrived on the interface used to route traffic to the destination address

to ensure that multicast packets are dropped if they arrived on the interface used to route traffic back to the source address

to ensure that multicast packets, no matter the interface they arrived on are forwarded out all interfaces

Correct Answer: A, D

The RPF (Reverse Path Forwarding) check in multicast routing ensures that multicast packets are forwarded if they arrived on the interface used to route traffic back to the source address (to prevent loops and ensure proper path). Thus, if a multicast packet does not arrive on the expected interface, it is dropped. This ensures the packet is following the correct path according to the routing table, preventing any potential routing loops or incorrect routing.

Discussion

rickyarchiOptions: AC

A & C are correct

cybman76

RPF checking destination address?????