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Question 22 - JN0-664 discussion

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Which two statements describe PIM-SM? (Choose two)

A.
Routers with receivers send join messages to their upstream neighbors.
Answers
A.
Routers with receivers send join messages to their upstream neighbors.
B.
Routers without receivers must periodically prune themselves from the SPT.
Answers
B.
Routers without receivers must periodically prune themselves from the SPT.
C.
Traffic is initially flooded to all routers and an S,G is maintained for each group
Answers
C.
Traffic is initially flooded to all routers and an S,G is maintained for each group
D.
Traffic is only forwarded to routers that request to join the distribution tree.
Answers
D.
Traffic is only forwarded to routers that request to join the distribution tree.
Suggested answer: A, D

Explanation:

PIM sparse mode (PIM-SM) is a multicast routing protocol that uses a pull model to deliver multicast traffic. In PIM-SM, routers with receivers send join messages to their upstream neighbors toward a rendezvous point (RP) or a source-specific tree (SPT). The RP or SPT acts as the root of a shared distribution tree for a multicast group. Traffic is only forwarded to routers that request to join the distribution tree by sending join messages. PIM-SM does not flood traffic to all routers or prune routers without receivers, as PIM dense mode does.

asked 18/09/2024
Vasyl Basaraba
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