200-301 Question #982: Real Exam Question with Answer & Explanation

Question

Refer to the exhibit. The loopback1 interface of the Atlanta router must reach the lookback3 interface of the Washington router.

Options

• Aipv6 route 2000::1/128 2012::2
• Bipv6 route 2000::1/128 2012::1
• Cipv6 route 2000:3/123 s0/0/0
• Dipv6 route 2000::3/128 2023::3
• Eipv6 route 2000::1/128 s0/0/1

Explanation

The question requires configuring static IPv6 routes on the Atlanta router to ensure reachability to specific loopback interfaces on the Washington router.

Common mistakes.

• A. The destination network 2000::1/128 is valid, but 2012::2 would be the IP address of an interface on the Atlanta router itself, not a valid next-hop IP for reaching a remote destination.
• C. The destination 2000:3/123 is an incorrect IPv6 address format and prefix length for a /128 loopback address, and s0/0/0 alone is an outgoing interface, which is generally not preferred for static routes to a specific /128 host unless it's a point-to-point link.
• E. The destination network 2000::1/128 is valid, but s0/0/1 is an outgoing interface and should be combined with a next-hop IP for reliability and proper routing table population, especially if it's not a point-to-point link.

Concept tested. Static IPv6 routing configuration

Reference. https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/iproute_static/configuration/xe-16-9/irs-xe-16-9-book/irs-static-routes.html

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