400-007: Cisco Certified Design ExpertDemo

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QuestionQ310

Network Design

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Refer to the exhibit. As part of a redesign project, you must predict multicast behavior. What occurs to multicast traffic received on the indicated LHR interface for the shared tree (*, G)?

  • A It is switched due to a successful RPF check against the routing table.
  • B It is switched given that no RPF check is performed.
  • C It is dropped due to an unsuccessful RPF check against the multicast receiver.
  • D It is dropped due to an unsuccessful RPF check against the multicast source.
Explanation

For a PIM shared-tree (,G) entry, the RPF lookup is performed toward the RP using the unicast routing table. Traffic arriving at the LHR on its RPF interface toward the RP passes that check and is switched. RPF validation against the multicast source applies to source-tree (S,G) state, not shared-tree (,G) state.

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