Refer to the Exhibit.
In the exhibit, what happens if the source starts sending multicast traffic toward R1 and there are
receivers registered at the RP?
A.
R1 encapsulates the multicast packets into a PIM register multicast packet.
B.
R1 encapsulates the multicast packets into PIM join unicast messages.
C.
R1 forwards the multicast packets on the S,G tree towards the RP.
D.
R1 tunnels the multicast packets in PIM register messages toward the RP.
When the source starts transmitting multicast data, the PIM-SM DR directly connected to the source encapsulates the data in PIM Register messages and sends these PIM Register messages via unicast routing to the RP address.
Correct answer is A.
yeah, A is not wrong. However I would say D is more complete.
PIM register is unicast but not multicast.