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Exam 300-410 topic 1 question 32 discussion

Actual exam question from Cisco's 300-410

Question #: 32
Topic #: 1

An engineer configured two routers connected to two different service providers using BGP with default attributes. One of the links is presenting high delay, which causes slowness in the network.
Which BGP attribute must the engineer configure to avoid using the high-delay ISP link if the second ISP link is up?

A. AS-PATH
B. WEIGHT
C. MED
D. LOCAL_PREF

Show Suggested Answer

Suggested Answer: D 🗳️

by [deleted] at July 31, 2021, 12:55 p.m.

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JingleJangus

Highly Voted 3 years, 6 months ago

Selected Answer: D

It D. The key word is TWO routers in the AS. We need a solution that works for both, and only needs to be configured once. Yes, weight could work, however it isnt the best solution here since its locally significant.

upvoted 8 times

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GoodServant

Highly Voted 1 year, 2 months ago

Selected Answer: D

Both options A and C, influence inbound routing from external systems. Not relevant, here, as we are trying to influence outbound path selection. Given that the engineer is dealing with two routers connected to different ISPs, using LOCAL_PREF is preferred because it ensures that the preference is consistent across the entire AS, not just on a single router. So, while configuring **weight** can achieve a similar outcome on a single router, **local preference** is generally preferred for broader and more consistent influence across all routers within the AS.

upvoted 6 times

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Ll123123

Most Recent 1 year, 9 months ago

Selected Answer: D

I choose D. Because the question said he is configuring the "2" router connecting to ISP, if he can configure the router connecting to the two routers, he can change the WEIGHT. But if he is on the two router, the only config that can influence other is Local_Pref.

upvoted 3 times

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SnoopDD

1 year, 9 months ago

i think it's A

upvoted 1 times

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CosmasNyoni

2 years ago

I choose D

upvoted 1 times

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Huntkey

2 years, 10 months ago

I think it is A. only A is possible to affect choosing for both directions. The other options only affect one direction.

upvoted 2 times

Huntkey

2 years, 10 months ago

Can you say you avoided using one link if only one direction is not using the link but the other direction continues to use it?

upvoted 1 times

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Spyrous

3 years, 5 months ago

If the question stated TWO cisco routers, then the answer would be B. Setting the weight with an inbound route map, you can influence outbound traffic. The same goes for local preference, second attribute in the list of preference in cisco routers, but first in non-cisco routers. I agree that the answer should be D.

upvoted 1 times

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Macferson

3 years, 6 months ago

The answer is D, The Local Preference attribute is used: To choose between multiple exit paths from your network - Non-transitive and optional attribute - Local to an AS only * Default local preference is 100 (IOS) - Used to influence BGP path selection * Determines the best path for outbound traffic - Path with highest local preference wins

upvoted 4 times

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Raider1

3 years, 9 months ago

D is correct: Three steps are by far the most important ones. Prefer the path with the highest local preference Prefer the path with the shortest AS path Prefer the path with the lowest multi-exit discriminator (MED)

upvoted 2 times

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error_909

3 years, 10 months ago

The given answer is correct

upvoted 1 times

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geek1992

3 years, 11 months ago

D IS CORRECT

upvoted 1 times

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geek1992

3 years, 11 months ago

A and 100% sure

upvoted 2 times

cryptonite

3 years, 10 months ago

AS_PATH prepends allows you to ensure that returning traffic to the network uses path with the short AS-Path. I will go with AS-Path because with it, one can influence how traffic returns from the rest of the world. Local preference only determines how traffic exits the network if there are multiple routers so this is wrong. MED is like metric, MED is what we learn from our upstream service provider or we set the Med on the way in. But Med only chooses the exit link not how the traffic returns.

upvoted 2 times

cryptonite

3 years, 10 months ago

Local Preference is correct, apologies. There are multiple routers.

upvoted 1 times

studybuddy10

3 years, 8 months ago

The production world answer for this is both A and D, prepend adverts out the slower link and use local preference to exit out the better link. The cisco answer is local preference as they mention 2 routes which is the key here.

upvoted 2 times

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Hammad745

3 years, 12 months ago

Weight is the correct answer

upvoted 1 times

vdsdrs

3 years, 11 months ago

No, weight is local to router. In the question we have two routers connected to two ISPs. Local_pref is exchanged between IBGP peers. D is correct answer.

upvoted 1 times

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AliMo123

3 years, 12 months ago

D is correct You can use local preference to choose the outbound external BGP path.

upvoted 1 times

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[Removed]

4 years ago

B weight

upvoted 1 times

cyrus777

3 years, 4 months ago

weight is local to router. In the question we have two routers connected to two ISPs. Local_pref is exchanged between IBGP peers. D is correct answer.

upvoted 2 times

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