300-320 Question #512: Real Exam Question with Answer & Explanation

The correct answer is D: Pim-SSM. PIM Source-Specific Multicast (SSM) does not use a Rendezvous Point (RP). SSM leverages IGMPv3 to allow receivers to specify both the multicast group AND the specific source address they want to receive from, using the 232.0.0.0/8 address range. Because the source is already know

Question

What multicast design would you use that cannot use rendezvous points?

Options

APim bidirectional
BPim Sparse
CPim Dense
DPim-SSM

Explanation

PIM Source-Specific Multicast (SSM) does not use a Rendezvous Point (RP). SSM leverages IGMPv3 to allow receivers to specify both the multicast group AND the specific source address they want to receive from, using the 232.0.0.0/8 address range. Because the source is already known at join time, there is no need for an RP to act as a meeting point between sources and receivers. PIM Sparse Mode requires an RP for source discovery. PIM Bidirectional also uses an RP. PIM Dense Mode uses flood-and-prune but not SSM - it does not require an RP but uses a different mechanism entirely.

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