300-510 SPRI: Implementing Cisco Service Provider Advanced Routing SolutionsDemo

By Cisco · Question Mode

QuestionQ186

Unicast Routing

Question Image

Refer to the exhibit. While applying the configurations on two routers, an engineer observes that the OSPF adjacency between them stays down. A ping test confirms that both routers have Layer 3 reachability with each other. What action should the engineer take to bring the adjacencies to full?

  • A Enable OSPF just inside the router OSPF process, not in the interfaces of any router
  • B Delete the area 0 authentication message-digest command from the OSPF process in R1
  • C Enter the command ip ospf authentication in R2 interface
  • D Delete the area 0 authentication message-digest command from the OSPF process in R2
Explanation

OSPF neighbors must use matching authentication methods as well as matching keys. R1 uses interface-level simple authentication, whereas R2 uses area-level message-digest authentication. Applying ip ospf authentication under R2’s interface makes R2 use simple authentication too, matching R1 and allowing the adjacency to reach the full state.

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