300-410 Question #56: Real Exam Question with Answer & Explanation

Question

Refer to the exhibit. Which of the following statements about the configuration is true?

Options

• ANetwork 172.16.1.0/24 is not redistributed into OSPF.
• BNetwork 10.10.10.0/24 is not redistributed into OSPF.
• CNetwork 172.16.1.0/24 is redistributed with administrative distance of 1.
• DNetwork 10.10.10.0/24 is redistributed with administrative distance of 20.

Explanation

The configuration implied by the question indicates that network 172.16.1.0/24 is explicitly excluded from or not covered by the OSPF redistribution parameters. Consequently, routes belonging to this network will not be advertised into the OSPF routing domain.

Common mistakes.

• B. If 172.16.1.0/24 is not redistributed, it implies other networks, possibly 10.10.10.0/24, are, making this statement false.
• C. Administrative distance is a value used by a router to choose the best path when there are two or more different routes to the same destination from different routing protocols, it is not applied to the redistributed network itself during redistribution.
• D. Administrative distance 20 is the default for external EIGRP routes when redistributed into other protocols, but this value is applied by the receiving router to the learned external route, not by the redistributing router to the network itself.

Concept tested. OSPF Redistribution Filtering

Reference. https://www.cisco.com/c/en/us/support/docs/ip/open-shortest-path-first-ospf/7039-7.html

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