400-007: Cisco Certified Design ExpertDemo

By Cisco · Question Mode

QuestionQ300

Network Design

An engineer is designing a DMVPN network that uses OSPF as the routing protocol. A spoke-to-spoke data-propagation model must be configured. Which two design considerations must be considered?

Choose two
  • A The hub should be the DR by changing the priority of the spokes to 0
  • B The hub should be set as the DR by specifying the priority to 255
  • C The network type on all sites should be point-to-multipoint
  • D The network type should be point-to-multipoint for the hub and point-to-point for the spokes
  • E Configure all the sites as network type broadcast
Explanation

For the traditional OSPF DMVPN spoke-to-spoke design, all tunnel interfaces use the OSPF broadcast network type so routes to remote spoke networks retain the remote spoke as the next hop rather than forcing traffic through the hub. The hub must be the designated router, and assigning OSPF priority 0 to every spoke prevents any spoke from being elected DR or BDR.

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