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Question 291 - 400-007 discussion

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Refer to the exhibit.

The network 10.10.0 .0/16 has been redistributed to OSPF processes and the best path to the destination from R1 has been chosen as R1-R2-R3 A failure occurred on the link between R2 and R3 and the path was changed to R1-R4-R5-R3 What happens when the link between R2 and R3 is restored'?

A.

The path R1-R4-R5-R3 continues to be the best path because the metric is better

Answers
A.

The path R1-R4-R5-R3 continues to be the best path because the metric is better

B.

The path reverts back to R1-R2-R3 because the route type is E1

Answers
B.

The path reverts back to R1-R2-R3 because the route type is E1

C.

The path R1-R4-R5-R3 continues to be the best path because OSPF does not compare the metrics between two domains

Answers
C.

The path R1-R4-R5-R3 continues to be the best path because OSPF does not compare the metrics between two domains

D.

The path reverts to R1-R2-R3 because this was the previous best path

Answers
D.

The path reverts to R1-R2-R3 because this was the previous best path

Suggested answer: D

Explanation:

When the link between R2 and R3 is restored, the path reverts back to R1-R2-R3 because this was the previous best path. This is because OSPF uses the Dijkstra algorithm to calculate the shortest path tree (SPT) and the path with the lowest cost is chosen as the best path. In this case, the cost of the path R1-R2-R3 is lower than the cost of the path R1-R4-R5-R3, so the path R1-R2-R3 is chosen as the best path. OSPF also has a preference order for different types of routes, such as intra-area, inter-area, external type 1, external type 2, NSSA type 1, and NSSA type 2. However, this preference order only applies when OSPF has to choose between routes of different types to the same destination.In this scenario, both paths are external type 2 routes, so the preference order does not affect the path selection

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asked 10/10/2024
IOSSIF ZINGUER
46 questions
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