350-029 · Question #297
In PIM-SM operations, the first router connected to the multicast source sends the Register message to which device?
The correct answer is C. RP. A multicast data sender just starts sending data destined for a multicast group. The sender's local router (DR) takes those data packets, unicast-encapsulates them, and sends them directly to the RP. The RP receives these encapsulated data packets, decapsulates them, and…
Question
In PIM-SM operations, the first router connected to the multicast source sends the Register message to which device?
Options
- AMulticast source
- BMulticast receiver
- CRP
- DRP mapping agent
- EDesignated Router (DR)
How the community answered
(22 responses)- A5% (1)
- B14% (3)
- C77% (17)
- D5% (1)
Explanation
A multicast data sender just starts sending data destined for a multicast group. The sender's local router (DR) takes those data packets, unicast-encapsulates them, and sends them directly to the RP. The RP receives these encapsulated data packets, decapsulates them, and forwards them onto the shared tree. The packets then follow the (*,G) multicast tree state in the routers on the RP Tree, being replicated wherever the RP Tree branches, and eventually reaching all the receivers for that multicast group. The process of encapsulating data packets to the RP is called registering, and the encapsulation packets are known as PIM Register packets.
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