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Which multicast protocol uses source trees and RPF?
Correct Answer: A
Explanation/Reference: Explanation: DVMRP builds a parent-child database using a constrained multicast model to build a forwarding tree rooted at the source of the multicast packets. Multicast packets are initially flooded down this source tree. If redundant paths are on the source tree, packets are not forwarded along those paths. Forwarding occurs until prune messages are received on those parent-child links, which further constrains the broadcast of multicast packets. Reference: DVMRP and dense-mode PIM use only source trees and use RPF as previously described. Reference: http://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst3550/software/release/12-1_19_ea1/ configuration/guide/3550scg/swmcast.html