In a PIM Sparse Mode network, which device must a new multicast server register with before its traffic is propagated?

In PIM Sparse Mode, a new multicast source must register with the Rendezvous Point (RP). The RP acts as a central meeting point for sources and receivers. When a source first starts sending multicast traffic, its Designated Router (DR) encapsulates the first few packets in a PIM Register message and sends them to the RP. This process informs the RP about the active source. Receivers, having joined a multicast group, send PIM Join messages towards the RP to discover active sources. Incorrect options: IGMP Querier: The IGMP Querier discovers multicast group members on a local segment, but doesn't handle source registration in PIM Sparse Mode. Local PIM router: While the local PIM router (specifically, the DR for the source's segment) initiates the registration process, it sends the registration to the RP, not acting as the registration point itself. Local IGMP switch: An IGMP switch (or Layer 2 device) handles IGMP snooping to forward multicast traffic efficiently within a LAN, but it's not involved in PIM source registration.