400-007: Cisco Certified Design ExpertDemo

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QuestionQ263

Service Design

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Refer to the exhibit. This enterprise customer needs to stream one-way video by multicast from its head office to eight branch offices. The current service provider delivers a Layer 3 VPN and manages the CE routers, but does not presently support multicast. Which solution rapidly enables this multicast traffic to traverse the network while supporting future scalability?

  • A Enable a GRE tunnel between nodes C1 and C4.
  • B Enable a GRE tunnel between nodes C2 and C4.
  • C Enable a GRE tunnel between nodes CE1 and CE2.
  • D Implement hub and spoke MPLS VPN over DMVPN (also known as 2547oDMVPN) between CE1 and CE2.
  • E The service provider must provide a Draft Rosen solution to enable a GRE tunnel between nodes PE1 and PE2.
Explanation

A hub-and-spoke 2547oDMVPN overlay provides multicast transport from the head-office hub to multiple branch spokes across a unicast-only provider VPN. DMVPN supports IP multicast between hubs and spokes, while 2547oDMVPN carries segmented MPLS VPN traffic over that scalable overlay. Adding branch offices requires adding spokes rather than creating a separate point-to-point GRE design for every branch.

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