Question

A network engineer is deploying multicast for a video streaming application across an enterprise campus using PIM Sparse Mode. When the first receiver on a LAN sends an IGMP join for group 239.10.20.30, its last-hop router builds a multicast forwarding entry and sends a PIM Join upstream. Toward which device does this initial PIM Join travel to establish the shared distribution tree?

Accepted Answer

Toward the Rendezvous Point (RP) for the group

Answer

Toward the source's directly connected first-hop router (the DR)

Answer

Toward the IGMP querier elected on the receiver's LAN

Answer

Toward the multicast source using a shortest-path (S,G) join