300-415 Question #35: Real Exam Question with Answer & Explanation

The correct answer is C: vpn vpn-id router ospf area number range prefix/length. To make a WAN Edge router a less preferred exit from a site in a dual WAN Edge design using OSPF, the max-metric command should be configured.

WAN Edge Router Deployment

Question

Which OSPF command makes the WAN Edge router a less preferred exit from a site with a dual WAN Edge design?

Options

Avpn vpn-id router ospf area number max-metric
Bvpn vpn-id router ospf area number nssa no-summary
Cvpn vpn-id router ospf area number range prefix/length
Dvpn vpn-id router ospf area number no-summary

Explanation

To make a WAN Edge router a less preferred exit from a site in a dual WAN Edge design using OSPF, the max-metric command should be configured.

Common mistakes.

B. nssa no-summary modifies summary LSA advertisement in Not-So-Stubby Areas but does not directly influence the router's overall preference as an exit point.
C. range prefix/length is used for route summarization at ABRs, consolidating routes, which optimizes routing tables but does not specifically make the local router less preferred for egress traffic.
D. no-summary disables the advertisement of summary LSAs into a stub or NSSA area, affecting route distribution but not the cost of paths through the router itself.

Concept tested. OSPF path preference manipulation with max-metric

Reference. https://www.cisco.com/c/en/us/td/docs/routers/sdwan/command/sdwan-cr-book/sdwan-cr-book_chapter_01.html#wp4102143003

Topics

#OSPF#Route Summarization#Path Preference#WAN Edge Router

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