The network design team has decided to activate multicast in the network. Auto-RP has been
selected as the RP mechanism. Which PIM operational mode must be enabled in this network?
A.
sparse mode
B.
sparse-dense mode
C.
dense mode
D.
source specific multicast
Explanation:
http://www.juniper.net/documentation/en_US/junos12.1×46/topics/topic-map/mcast-pim-auto-rp.html
The mapping agent sends the multicast group-RP mapping information to the other routers using PIM dense mode. The specific groups used are 224.0.1.39 and .40. The first (.39) is used to advertise, the second (.40) is used for discovery. Because PIM dense mode is necessary to enable auto-RP to work, which in turns enables PIM sparse mode to work, you must configure PIM sparse-dense mode in the PIM domains that use auto-RP.
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