JNCIP-SP: Juniper Networks Certified Professional – Service Provider (2023) — Question 66

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

Answer options

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

Correct answer: B, D

Explanation

Option B is correct because PIM-SM operates on demand, only sending traffic to routers that actively join the multicast distribution tree. Option D is also correct as routers with receivers must send join messages upstream to establish their participation. Options A and C are incorrect as they misrepresent how PIM-SM manages traffic and router participation.