Juniper JN0-664 Exam - Topic 7 Question 61 Discussion

Actual exam question for Juniper's JN0-664 exam

Question #: 61
Topic #: 7

[All JN0-664 Questions]

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

ARouters with receivers send join messages to their upstream neighbors.

BRouters without receivers must periodically prune themselves from the SPT.

CTraffic is initially flooded to all routers and an S,G is maintained for each group

DTraffic is only forwarded to routers that request to join the distribution tree.

Show Suggested Answer

Suggested Answer: A, D

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.

by Tambra at Apr 12, 2026, 07:49 PM

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Sherill

1 day ago

I think option A sounds familiar because I remember something about join messages in PIM-SM.

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