Exam 350-501 topic 1 question 402 discussion

Actual exam question from Cisco's 350-501

Question #: 402
Topic #: 1

Refer to the exhibit. An engineer with an employee ID: 1234:56:789 started to configure two routers for OSPF for a client. They are advertising their loopback addresses. Which additional configuration must the engineer perform so that the GigabitEthernet 1/1 link is preferred and the GigabitEthernet 2/1 link is a backup?

A. router1(config)# router ospf 1
Router1 (config-router)# auto-cost reference-bandwidth 1000

router2(config)# router ospf 1
router2(config-router)# auto-cost reference-bandwidth 1000
B. router1(config)# router ospf 1
router1(config-router)# auto-cost reference-bandwidth 100

router2(config)# router ospf 1
router2(config-router)# auto-cost reference-bandwidth 100
C. router1(config)# interface gigabitethernet 1/1
router1(config-if)/# ip ospf cost 64

router2(config)# interface gigabitethernet 1/1
router2(config-if)# ip ospf cost 64
D. router1(config)# interface gigabitethernet 2/1
router1(config-if)# ip ospf cost 5

router2(config)# interface gigabitethernet 2/1
router2(config-if)# ip ospf cost 5

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Suggested Answer: C 🗳️

by ashwind123 at June 4, 2025, 4:09 p.m.

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ashwind123

2 weeks, 2 days ago

Selected Answer: D

I would go with D with a below logic: 1. by default OSPF cost will be 1 for anything more than 100Mb link since by default Cisco default reference-bandwidth is 100M, hence considering our links here is 1G link the cost by default should be 1 and by setting gig2/1 cost to be 5 will make less preferred over gig1/1

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