Exam 300-420 topic 1 question 196 discussion

Actual exam question from Cisco's 300-420

Question #: 196
Topic #: 1

Refer to the exhibit. A network engineer is designing an OSPF solution to connect a company's remote to a newly provisioned MPLS VPN backbone. Some of the branches have a direct dark fiber connection between each other. The engineer wants to ensure that the dark fibers are used only when the MPLS core is unavailable. Which solution must the engineer choose?

A. Stub area
B. Sham link
C. Virtual link
D. NSSA

Show Suggested Answer

Suggested Answer: B 🗳️

by leodev at Oct. 14, 2022, 9:33 p.m.

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leodev

Highly Voted 2 years, 1 month ago

Selected Answer: B

B is correct: https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/iproute_ospf/configuration/xe-16/iro-xe-16-book/iro-sham-link.html

upvoted 5 times

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08511d4

Most Recent 5 months, 3 weeks ago

Haha they love asking about sham links.

upvoted 1 times

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mgiuseppe86

1 year, 1 month ago

Selected Answer: B

Because the sham-link is seen as an intra-area link between PE routers, an OSPF adjacency is created and database exchange (for the particular OSPF process) occurs across the link. The PE router can then flood LSAs between sites from across the MPLS VPN backbone. As a result, the desired intra-area connectivity is created.

upvoted 1 times

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Exam 300-420 topic 1 question 196 discussion

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leodev

08511d4

mgiuseppe86

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