Alcatel-Lucent NRS II – Multicast Routing — Question 8

What will be the immediate action of the last hop router on receipt of an IGMP version 2 leave message?

Answer options

• A. It will send a PIM (*, G) prune to the RP
• B. It will send a PIM (S, G) prune to the source
• C. It will send a PIM (*, G) prune to the RP and a PIM (S, G) prune to the source
• D. It will issue an IGMP Group Specific Query
• E. It will issue an IGMP General Query

Correct answer: D

Explanation

The correct answer is D because when a last hop router receives an IGMP leave message, it sends an IGMP Group Specific Query to determine if there are any other hosts still interested in that multicast group. Options A, B, and C involve PIM pruning actions that are not the immediate response to an IGMP leave, while option E refers to a different type of IGMP query that is not specific to the group.