300-320 · Question #512
What multicast design would you use that cannot use rendezvous points?
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…
Question
What multicast design would you use that cannot use rendezvous points?
Options
- APim bidirectional
- BPim Sparse
- CPim Dense
- DPim-SSM
How the community answered
(42 responses)- B7% (3)
- C5% (2)
- D88% (37)
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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