200-301: Cisco Certified Network AssociateDemo

Question

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Refer to the exhibit. Router OldR is replacing another router on the network with the goal of having OldR and R2 exchange routes.

After the engineer applied the initial OSPF configuration, the routes were still missing on both devices. Which command sequence must be entered before the clear ip ospf process command to enable the neighbor relationship?

A OldR(config)#interface g0/0/0 OldR(config-if)#ip ospf hello-interval 15
B OldR(config)#router ospf 1 OldR(config-router)#network 192.168.1.0 255.255.255.0 area 2
C OldR(config)#interface g0/0/0 OldR(config-if)#ip ospf dead-interval 15
D OldR(config)#router ospf 1 OldR(config-router)#no router-id 192.168.1.1

Explanation

OSPF neighbors must use unique router IDs. The exhibit shows both OldR and R2 using router ID 192.168.1.1, so adjacency and route exchange will fail even though the interfaces are in the same subnet, area, and have matching hello/dead timers. Removing the configured router ID on OldR allows it to select a different router ID when the OSPF process is cleared and restarted, which enables the neighbor relationship.

Learn more

Cisco IOS OSPF Command Reference – router-id

200-301: Cisco Certified Network AssociateDemo

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