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352-001 · Question #398
352-001 Question #398: Real Exam Question with Answer & Explanation
The correct answer is A: Bidirectional PIM. Bidirectional PIM (Bidir-PIM) is purpose-built for many-to-many multicast by using a single shared bidirectional tree rooted at the RP, which eliminates per-source state and minimizes infrastructure load.
Question
Which multicast technology provides a large, many-to-many connectivity for a new application while minimizing load on the existing network infrastructure?
Options
- ABidirectional PIM
- BPIM Sparse Mode
- CAny-source Multicast
- DSource Specific Multicast
Explanation
Bidirectional PIM (Bidir-PIM) is purpose-built for many-to-many multicast by using a single shared bidirectional tree rooted at the RP, which eliminates per-source state and minimizes infrastructure load.
Common mistakes.
- B. PIM Sparse Mode builds source-specific shortest-path trees (SPTs) after initial shared-tree delivery, creating per-(S,G) state for every active source, which generates significant router state and overhead in a large many-to-many scenario.
- C. Any-source Multicast (ASM) is a service model, not a distinct protocol, and is implemented by PIM-SM which still creates per-source state entries that increase infrastructure load as sources scale.
- D. Source Specific Multicast (SSM) requires receivers to know the specific source address in advance and is optimized for one-to-many distribution, making it poorly suited for many-to-many applications where sources are dynamic and unknown.
Concept tested. Bidirectional PIM for scalable many-to-many multicast
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