300-410 ENARSI: Implementing Cisco Enterprise Advanced Routing and ServicesDemo

By Cisco · Question Mode

QuestionQ87

VPN Technologies

A network engineer must configure a DMVPN network so that a spoke creates a direct path to another spoke when the two need to exchange traffic. A spoke must send traffic directly to the hub when necessary. Which configuration fulfills this requirement?

  • A At the hub router:interface tunnel10ip nhrp nhs dynamic multipointip nhrp nhs shortcuttunnel mode gre multicastOn the spokes router:interface tunnel10ip nhrp nhs multicast dynamicip nhrp nhs redirecttunnel mode gre multicast
  • B At the hub router:interface tunnel10ip nhrp map dynamic multipointip nhrp redirecttunnel mode gre multicastOn the spokes router:interface tunnel10ip nhrp map multicast dynamicip nhrp shortcuttunnel mode gre multicast
  • C At the hub router:interface tunnel10ip nhrp nhs multicast dynamicip nhrp nhs shortcuttunnel mode gre multipointOn the spokes router:interface tunnel10ip nhrp nhs multicast dynamicip nhrp nhs redirecttunnel mode gre multipoint
  • D At the hub router:interface tunnel10ip nhrp map multicast dynamicip nhrp redirecttunnel mode gre multipointOn the spokes router:interface tunnel10ip nhrp map multicast dynamicip nhrp shortcuttunnel mode gre multipoint
Explanation

DMVPN Phase 3 uses ip nhrp redirect on the hub to signal a suboptimal hub-forwarded path, and ip nhrp shortcut on spokes to resolve and use the direct spoke-to-spoke tunnel. Dynamic NHRP mapping and tunnel mode gre multipoint provide the mGRE/NHRP foundation for this dynamic connectivity.

Learn more

Community Discussion

No comments yet. Be the first to start the discussion!