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Implementing and Operating Cisco Enterprise Network Core Technologies (ENCOR) · Cisco
Select one answer.
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D. The RP responds to the PIM join messages with the source of a requested multicast group. In PIM (Protocol Independent Multicast) Sparse Mode, the RP (Rendezvous Point) plays a crucial role in facilitating the multicast traffic delivery to the receivers. The RP is responsible for keeping track of the multicast groups and their associated sources in the network. It receives the join messages from the routers and forwards them to the appropriate source(s) of the group. The RP also maintains a mapping between the multicast group address and the source(s) associated with it. When the RP receives the multicast traffic from the source(s), it forwards it to all the routers in the network that have requested to join the group.
RP is root of the PIM-SM SPT. So answer is C.
Answer is 100% C; D is incorrect because RP does not respond to a Join message, it simply forwards the multicast stream to the reciever . ( See also answer from "RTE" and "lukaszr")