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Juniper JN0-664 Exam - Topic 7 Question 61 Discussion

Which two statements describe PIM-SM? (Choose two)
A) Routers with receivers send join messages to their upstream neighbors. and D) Traffic is only forwarded to routers that request to join the distribution tree.
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

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)

Show Suggested Answer Hide 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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Lavonda
3 days ago
I agree, A is definitely right. Join messages are key.
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Vicky
8 days ago
I think A and D are correct. Makes sense for PIM-SM.
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Nobuko
14 days ago
I thought routers without receivers just stay quiet, not prune themselves!
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Annice
19 days ago
C) is a classic method, but I’m not sold on it being the best approach.
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Kayleigh
24 days ago
Wait, are we sure about B)? Pruning seems off for routers without receivers.
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Darrin
2 months ago
I think D) is correct too. Only forwarding to those who join makes sense.
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Nu
3 months ago
A) is definitely true! Join messages are key.
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Fletcher
3 months ago
I recall that routers without receivers don't prune themselves, so I think option B might be incorrect.
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Anisha
3 months ago
I practiced a question similar to this, and I think option C was about flooding traffic, but I'm not confident about it.
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Verda
3 months ago
I'm not entirely sure, but I feel like option D could be correct since it mentions traffic forwarding only to routers that join.
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Sherill
4 months ago
I think option A sounds familiar because I remember something about join messages in PIM-SM.
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