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Question 159 - 350-601 discussion

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Refer to the exhibit.

All switches are configured with the default OSPF priority. Which configuration should be applied to ensure that the SW2 Cisco Nexus switch controls the LSA floods and advertises the network to the remaining nodes in the OSPFv2 area?

A.

SW2# configure terminal SW2 (config)# interface ethernet 1/1 SW2 (config-if)# ip ospf priority 255

Answers
A.

SW2# configure terminal SW2 (config)# interface ethernet 1/1 SW2 (config-if)# ip ospf priority 255

B.

SW2# configure terminal SW2 (config)# interface ethernet 1/1 SW2 (config-if)# ip ospf priority 1

Answers
B.

SW2# configure terminal SW2 (config)# interface ethernet 1/1 SW2 (config-if)# ip ospf priority 1

C.

SW2# configure terminal SW2 (config)# router ospf 1 SW2 (config-router)# router-id 10.10.10.22

Answers
C.

SW2# configure terminal SW2 (config)# router ospf 1 SW2 (config-router)# router-id 10.10.10.22

D.

SW2# configure terminal SW2 (config)# interface ethernet 1/1 SW2 (config-if)# ip ospf priority 0

Answers
D.

SW2# configure terminal SW2 (config)# interface ethernet 1/1 SW2 (config-if)# ip ospf priority 0

Suggested answer: A

Explanation:

In OSPF, the router with the highest priority on a network becomes the Designated Router (DR), responsible for generating LSAs for the network. By default, all Cisco routers have an OSPF priority of 1. To ensure that SW2 becomes the DR and controls the LSA floods, its priority needs to be the highest in the OSPFv2 area. The command in option A sets the OSPF priority to the maximum value of 255, which will make SW2 the most likely candidate to be elected as the DR, provided that no other router has a higher priority or a higher router ID if priorities are equal.

asked 10/10/2024
L Zsolt
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