Cisco Exam 400-007 Topic 3 Question 34 Discussion

Actual exam question for Cisco's 400-007 exam

Question #: 34
Topic #: 3

Refer to the exhibit.

Company XYZ BGP topology is as shown in the diagram. The interface on the LA router connected toward the 10.1.5.0/24 network is faulty and is going up and down, which affects the entire routing domain. Which routing technique can be used in the routing policy design so that the rest of the network is not affected by the flapping issue?

AUse route dampening on LA router for the 10 1 5 0/24 network so that it does not get propagated when it flaps up and down

BUse route filtering on Chicago router to block the 10.1.5.0/24 network from coming in from the LA router

CUse route filtering on LA router to block the 10.15.0/24 network from getting propagated toward Chicago and New York

DUse route aggregation on LA router to summarize the 10.1.4.0V24, 10.1.5.0724, 10.1.6.0/24. and 10.1.7.0/24 networks toward Chicago

Show Suggested Answer

Suggested Answer: D

by Nobuko at Mar 04, 2024, 10:32 AM

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Jamie

12 months ago

Actually, using route aggregation on LA router to summarize the networks could also help in reducing the impact of the flapping interface.

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Kenny

12 months ago

But wouldn't route filtering on LA router be more effective in preventing the issue from spreading to other routers?

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Rashad

1 years ago

I think using route filtering on Chicago router to block the problematic network might be a better option.

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Jamie

1 years ago

I agree with Kenny. Route dampening can help stabilize the network during flapping events.

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Kenny

1 years ago

I think we should use route dampening on LA router to prevent the flapping from affecting the rest of the network.

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Kenda

1 years ago

Using route filtering on LA router to block the 10.1.5.0/24 network from getting propagated toward Chicago and New York could also work, right?

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Skye

1 years ago

I agree with Gertude, route dampening would help prevent the flapping issue from affecting the rest of the network.

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Deangelo

1 years ago

But wouldn't using route filtering on the Chicago router to block the 10.1.5.0/24 network also be a good solution?

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Gertude

1 years ago

I think the best option would be to use route dampening on the LA router for the 10.1.5.0/24 network.

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Deangelo

1 years ago

You know, I was just thinking the same thing. Route filtering is a more direct approach and might be a better option if the flapping is really problematic.

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Bernadine

1 years ago

But what if the flapping is really severe? Route dampening might not be enough to completely isolate the issue. Option B, using route filtering on the Chicago router to block the 10.1.5.0/24 network, could be a more reliable solution.

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Tequila

1 years ago

I think option A is the way to go. Using route dampening on the LA router for the 10.1.5.0/24 network will help suppress the route updates when the interface is flapping, so the rest of the network won't be affected.

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Jaime

1 years ago

Hmm, this is a tricky one. The issue seems to be with the interface on the LA router, which is causing the 10.1.5.0/24 network to flap up and down. We need to find a way to isolate that problem and prevent it from affecting the rest of the network.

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