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Exam 400-007 topic 1 question 178 discussion

Actual exam question from Cisco's 400-007
Question #: 178
Topic #: 1
[All 400-007 Questions]



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 the network administrator use so that the rest of the network is not affected by the flapping issue?

  • A. The LA administrator should use route dampening for the 10.1.5.0/24 network so that it does not get propagated when it flaps up and down.
  • B. The Chicago administrator should use route filtering to block the 10.1.5.0/24 network from coming in from the LA router.
  • C. The LA administrator should use route aggregation to summarize the 10.1.4.0/24, 10.1.5 0/24, 10.1.6.0/24, and 10.1.7.0/24 networks toward Chicago.
  • D. The LA administrator should use route filtering to block the 10.1.5.0/24 network from getting propagated toward Chicago and New York.
Show Suggested Answer Hide Answer
Suggested Answer: C 🗳️
by markmark1983 at Feb. 1, 2023, 9:06 p.m.

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Krlosbsk
Highly Voted 1 year, 4 months ago
Selected Answer: C
I think the answer is C because with BGP dampening, when a fault occurs, the LA Router will send an Update with the faulty network until reach the Threshold value. When we use a summary (with summary-only), the other routers wont be updated its Rounting Table.
upvoted 5 times
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Nery
Most Recent 1 month ago
Selected Answer: A
Correct is A. Keep in mind this is just a "knowledge and experience test" assesses both an individual's theoretical understanding and practical experience..
upvoted 1 times
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Nery
1 month ago
Selected Answer: A
Why route aggregation.?Aggregation can help, but it does not prevent the flapping route from affecting the larger summarized route if instability persists. The correct answer is A - Route dampening is a technique used in dynamic routing protocols like BGP to prevent unstable (flapping) routes from negatively impacting the entire routing domain.
upvoted 1 times
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sandccie
2 months, 3 weeks ago
Selected Answer: C
Use route aggregation instead of route dampening because enabling route dampening on LA router does not prevent LA router from sending the flapping route to other routers. This feature needs to implement to all other routers in order to dampen the route flapping issue.
upvoted 1 times
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Seawanderer
5 months, 1 week ago
Selected Answer: C
“ that the rest of the network is not affected”, it doesn't care about LA
upvoted 1 times
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Heim_Ox
1 year, 3 months ago
Selected Answer: C
Based on the wording of the questions, the interface of the router is directly connected to the 10.1.5.0/24 network. Route dampening is for flapping BGP routes. I don't think it helps for directly connected routes. Therefore, I'd choose C and prefer to rely on aggregation to limit the effect of that flapping network on upstream BGP neighbors.
upvoted 3 times
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markmark1983
1 year, 9 months ago
I think C is also possible answer?
upvoted 1 times
ying162
1 year, 8 months ago
the only problem I have with C is that by default BGP also propagates the prefixes unlesss summary-only is configured
upvoted 3 times
pizdecvsemu
1 year, 8 months ago
To add. The flapping link/prefix also affects LA router itself, so BGP route dampening will protect LA router and no prefix forwarding to other BGP routers.
upvoted 1 times
Seawanderer
5 months ago
"so that the rest of the network is not affected". The question doesn't care about LA
upvoted 1 times
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C (25%)
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