300-610 DCID: Designing Cisco Data Center InfrastructureDemo

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QuestionQ65

Network Design

An engineer needs to build a VXLAN flood-and-learn network. The customer requires that the solution be based on the IETF-documented practice in RFC 7348. The solution must use broadcast, unknown unicast, and multicast (BUM), and include the efficient BUM and short BUM replication modes that use only shared trees.

Which technology satisfies these requirements?

  • A MVPN
  • B PIM sparse mode
  • C PIM SSM
  • D Bidirectional PIM
Explanation

RFC 7348 maps VXLAN broadcast, unknown-unicast, and multicast traffic to IP multicast and specifies (*,G) joins because VTEPs can both send and receive multicast traffic. It explicitly identifies BIDIR-PIM as more efficient for that model. BIDIR-PIM maintains shared trees only, satisfying the requirement for shared-tree BUM replication.

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