Refer to the exhibit. R1 has taken the DROTHER role in the OSPF DR/BDR election process. Which configuration must an engineer implement 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
The default priority for an OSPF interface is 1. The higher the priority value the better. Priority values range between zero and 255. Priority takes precedence over router ID when electing the DR, BDR and DROTHER.
Note that the configuration is applied on the interface level.
We want R1 to be DR here. Considering all 3 routers are set to use default values for OSPF priority (I.e. value 1) and selection has happened on the basis of highest router ID (highest IP address of its interface), R1 is currently selected as DROTHER. To make it DR, it needs to have the highest priority. Hence correct answer is D from the given options.
Reason: On LANs, DR and BDR have to be elected. Two rules are used to elect a DR and BDR:
router with the highest OSPF priority will become a DR. By default, all routers have a priority of 1.
if there is a tie, a router with the highest router ID wins the election. The router with the second highest OSPF priority or router ID will become a BDR.
https://study-ccna.com/designated-backup-designated-router/
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