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Which two statements describe PIM-SM? (Choose two)
Suggested Answer: A, D
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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.
21 comments · newest first
SH
Shawna
1 month ago
I’m with Maryann on A and C. Flooding helps establish the tree.
KA
Karl
1 month ago
A and D seem solid. Only forwarding to routers that join is efficient.
BO
Bonita
1 month ago
I feel like B is misleading. Pruning isn’t periodic in PIM-SM.
MA
Maryann
2 months ago
I’m leaning towards A and C. Flooding is part of the process.
ME
Melinda
2 months ago
I agree, A is definitely right. Join messages are key.
FR
Freeman
2 months ago
I think A and D are correct. Makes sense for PIM-SM.
MA
Magdalene
2 months ago
I’m confused about C. Isn’t it more about targeted traffic?
LI
Lilli
2 months ago
A and D seem solid. Only forwarding to interested routers is efficient.
NI
Nicolette
2 months ago
I feel like B is misleading. Pruning isn’t periodic in PIM-SM.
RE
Rene
3 months ago
I’m leaning towards A and C. Flooding is part of it too.
LA
Lavonda
3 months ago
I agree, A is definitely right. Join messages are key.
VI
Vicky
3 months ago
I think A and D are correct. Makes sense for PIM-SM.
NO
Nobuko
3 months ago
I thought routers without receivers just stay quiet, not prune themselves!
AN
Annice
3 months ago
C) is a classic method, but I’m not sold on it being the best approach.
KA
Kayleigh
4 months ago
Wait, are we sure about B)? Pruning seems off for routers without receivers.
DA
Darrin
5 months ago
I think D) is correct too. Only forwarding to those who join makes sense.
NU
Nu
5 months ago
A) is definitely true! Join messages are key.
FL
Fletcher
6 months ago
I recall that routers without receivers don't prune themselves, so I think option B might be incorrect.
AN
Anisha
6 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.
VE
Verda
6 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.
SH
Sherill
6 months ago
I think option A sounds familiar because I remember something about join messages in PIM-SM.