300-410 · Question #56
Refer to the exhibit. Which of the following statements about the configuration is true?
The correct answer is A. Network 172.16.1.0/24 is not redistributed into OSPF. 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.
Question
Exhibit
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.
How the community answered
(40 responses)- A75% (30)
- B3% (1)
- C8% (3)
- D15% (6)
Why each option
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.
Without the exhibit, assuming the correct answer, the configuration for OSPF redistribution likely includes a route-map or distribute-list that specifically filters out or does not permit the 172.16.1.0/24 network, thereby preventing its redistribution into OSPF.
If 172.16.1.0/24 is not redistributed, it implies other networks, possibly 10.10.10.0/24, are, making this statement false.
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.
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
Source: https://www.cisco.com/c/en/us/support/docs/ip/open-shortest-path-first-ospf/7039-7.html
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