What is the RP's role in PIM Sparse Mode?
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Correct answer: The RP is the multicast router that is the root of the PIM-SM shared multicast distribution tree..
Why this is the answer
In PIM Sparse Mode (PIM-SM), the Rendezvous Point (RP) is a crucial router that serves as the root of the shared multicast distribution tree (RPT). Receivers initially join the RPT by sending PIM Join messages towards the RP. Sources, upon starting to send multicast traffic, register with the RP. The RP then forwards the source's traffic down the RPT to interested receivers. This allows receivers to discover active sources and for sources to discover interested receivers. Incorrect options: The RP does not maintain default aging timeouts for multicast streams; aging is handled by individual routers based on PIM states. The RP is not just a control-plane node; it actively receives and forwards multicast packets, at least initially, until receivers potentially switch to a shortest-path tree (SPT). The RP does not respond to PIM join messages with the source of a requested multicast group directly; it acts as an intermediary, forwarding traffic from the source to the receiver's branch of the RPT.
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