Which PIM mode uses a shared tree only?

The correct answer is A. bidirectional. Bidirectional PIM (BIDIR-PIM) exclusively uses a shared tree rooted at the Rendezvous Point (RP) for all multicast traffic - both source-to-RP and RP-to-receiver traffic flows along this shared tree. It never builds source-specific shortest-path trees (SPTs), which makes it…

Advanced Addressing and Routing Solutions

Question

Options

Abidirectional
Bsparse
Cdense
Dsource-specific

How the community answered

(42 responses)

A
93% (39)
C
5% (2)
D
2% (1)

Explanation

Bidirectional PIM (BIDIR-PIM) exclusively uses a shared tree rooted at the Rendezvous Point (RP) for all multicast traffic - both source-to-RP and RP-to-receiver traffic flows along this shared tree. It never builds source-specific shortest-path trees (SPTs), which makes it highly scalable for many-to-many multicast applications. PIM Sparse Mode (B) uses a shared tree initially but performs an SPT switchover to a source tree once a receiver's DR reaches a threshold. PIM Dense Mode (C) uses source trees built via flood-and-prune. PIM SSM (Source-Specific Multicast, D) uses only source trees - receivers specify the exact source they want, bypassing any shared tree entirely.

Topics

#PIM#Multicast#Shared Tree#Bidirectional PIM

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