Multicast is being deployed in the network, and only ip pim sparse-dense mode has been
configured on all interfaces in the network to support a new video streaming application. No other
multicast configuration was applied anywhere in the network. Since enabling multicast, the
network monitoring tools show periodic spikes in link utilization throughout the network, even in
areas where the video application is not being used. What could be a possible cause?

A.
PIM sparse mode is being used.

B.
PIM dense mode is being used.

C.
The BGP multicast address family has not been configured.

D.
IGMP version 3 is being used.

E.
IP PIM neighbor filters have not been applied.

Explanation:
PIM DM builds source-based multicast distribution trees. In dense mode, a PIM DM router or
multilayer switch assumes that all other routers or multilayer switches forward multicast packets
for a group. If a PIM DM device receives a multicast packet and has no directly connected
members or PIM neighbors present, a prune message is sent back to the source to stop unwanted
multicast traffic. Subsequent multicast packets are not flooded to this router or switch on this
pruned branch because branches without receivers are pruned from the distribution tree, leaving
only branches that contain receivers.