200-301: Cisco Certified Network AssociateDemo

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Refer to the exhibit.

R1 has assumed the DROTHER role in the OSPF DR/BDR election process. Which configuration must an engineer apply so that R1 is elected as the DR?

A R1(config)#interface FastEthernet 0/0 R1(config-if)#ip ospf priority 1 R1#clear ip ospf process
B R3(config)#interface FastEthernet 0/1 R3(config-if)#ip ospf priority 200 R3#clear ip ospf process
C R2(config)#interface FastEthernet 0/2 R2(config-if)#ip ospf priority 1 R2#clear ip ospf process
D R1(config)#interface FastEthernet 0/0 R1(config-if)#ip ospf priority 200 R1#clear ip ospf process

Explanation

On an OSPF broadcast segment, the designated router is elected by highest OSPF interface priority, with router ID used only as a tiebreaker among routers with the same priority. The exhibit shows the routers currently using priority 1, with R3 as DR and R2 as BDR, so R1 will not become DR unless its interface priority is raised above the others and the election is triggered again. Configuring R1’s participating interface with ip ospf priority 200 and then clearing the OSPF process forces a new election in which R1 is preferred as DR.

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ip ospf priority command reference

200-301: Cisco Certified Network AssociateDemo

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