What is the root cause of this issue?

Refer to the exhibit.

A router CE_RP is configured as a rendezvous point in an IPv4 multicast domain.

What is the root cause of this issue?
A . A PIM neighbor is sending a PIMv6 message to CE_RP, however IPv6 multicast is not enabled on this router
B . The multicast application from the 1.1.5.4 source is using a reserved IPv4 multicast address
C . The PIM adjacency between CE_RP and the downstream router is down
D . A downstream PIM router sent a join message, which CE_RP does not want to accept

View Answer

Answer: D