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Cisco 300-410 Exam - Topic 11 Question 105 Discussion

Actual exam question for Cisco's 300-410 exam
Question #: 105
Topic #: 11
[All 300-410 Questions]

Refer to the exhibit.

R1 has a route map configured, which results in a loss of partial IPv6 prefixes for the BGP neighbor, resulting in service degradation. How can the full service be restored?

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Suggested Answer: A

In OSPF (Open Shortest Path First), the MTU (Maximum Transmission Unit) size must match on both sides of a link for OSPF neighbors to form an adjacency12.If the MTU sizes do not match, the OSPF adjacency will not form, and the routers will not become neighbors12.

In this case, R1 cannot establish a neighbor relationship with R2.One possible reason for this could be a mismatch in the MTU size on the interfaces of R1 and R212.

To resolve this issue, you can configure themtu ignorecommand on the interfaces of R1 and R2 (Option A).This command allows OSPF to ignore the MTU size when determining if it can form an adjacency with a neighbor12.This means that even if the MTU sizes do not match, OSPF will still form an adjacency, and R1 and R2 will become neighbors12.


OSPF MTU Mismatch - NetworkLessons.com

Understanding OSPF MTU Mismatch Conditions and Solutions - Cisco

by Alana at Jan 10, 2025, 05:52 AM

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Curtis
4 months ago
Soft reconfiguration is a solid choice too, but B might be better.
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Glory
4 months ago
Option D seems too vague, not sure it would work.
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Ivette
4 months ago
Wait, are we sure about option C? Sounds risky.
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Precious
5 months ago
Definitely agree with that!
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Vi
5 months ago
I think option B is the way to go.
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Essie
5 months ago
The permit statement sounds familiar, but I’m uncertain if it’s the right one for restoring full service.
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Annita
5 months ago
I feel like the deny statement could be the answer, but I can't recall the exact conditions we discussed in class.
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Johana
5 months ago
I think we practiced a similar question where we had to adjust the route map. Maybe it's about adding prefixes to the list?
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Marsha
6 months ago
I remember something about soft reconfiguration, but I'm not sure if that's the right approach here.
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Iluminada
6 months ago
This is a tricky one, but I think the solution is in the route map. I'd start by looking at the "deny 20" statement and see if I can modify it to allow the missing prefixes to be advertised.
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Eladia
6 months ago
Okay, let's think this through step-by-step. The key seems to be the route map configuration on R1. I'll need to analyze the route map and see if I can find a way to restore the full service.
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Delsie
6 months ago
Hmm, I'm a bit unsure about this one. The question mentions a loss of partial IPv6 prefixes, so I'll need to carefully review the BGP neighbor configuration and the route map to see where the issue is.
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Rhea
6 months ago
This looks like a classic BGP policy issue. I'd start by checking the route map configuration on R1 and see if I can identify the problem there.
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Wava
10 months ago
Haha, this question is like a BGP Haiku - short, sweet, and full of hidden traps. Better choose wisely, folks!
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Azzie
9 months ago
D) The route map requires a permit 20 statement without set conditions, and this will allow additional prefixes to be advertised.
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Rodolfo
9 months ago
B) The prefix list requires all prefixes that R1 is advertising to be added to it, and this will allow additional prefixes to be advertised.
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Timothy
10 months ago
A) The neighbor requires a soft reconfiguration, and this will clear the policy without resetting the BGP TCP connection.
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Mabel
10 months ago
Wait, isn't option D just the opposite of what we want? Shouldn't we be restricting the route map, not allowing everything through?
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Kimi
10 months ago
Hmm, the 'deny 20' option sounds a bit risky. I'd go with the 'permit 20' approach to open things up without any unintended consequences.
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Jenifer
9 months ago
Let's go with the 'permit 20' statement to restore the full service.
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Rachael
9 months ago
Agreed, the 'deny 20' option might cause more issues than it solves.
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Roy
9 months ago
I think so too, it's better to allow additional prefixes to be advertised.
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Tony
10 months ago
I agree, the 'permit 20' option seems like the safer choice.
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Vilma
11 months ago
I'm not sure adding all prefixes to the prefix list is a good idea - that could potentially overload the router. The route map solution seems safer.
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Edna
10 months ago
User 3: The neighbor requires a soft reconfiguration to clear the policy without resetting the BGP TCP connection.
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Lauran
10 months ago
User 2: Agreed, adding all prefixes could overload the router.
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Lottie
10 months ago
User 1: I think the route map solution is safer.
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Willodean
11 months ago
I'm not sure, but I think option A makes sense because it mentions clearing the policy without disrupting the connection.
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Tanja
11 months ago
I agree with Elouise, a soft reconfiguration should clear the policy without resetting the BGP TCP connection.
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Elouise
11 months ago
I think the answer is A) The neighbor requires a soft reconfiguration.
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Carissa
12 months ago
The soft reconfiguration option seems like the quickest and cleanest way to restore full service without interrupting the BGP connection.
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Bettina
11 months ago
C) I think adding a deny statement to the route map without set conditions might also help.
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Ashley
11 months ago
A) That could work too, but the soft reconfiguration seems like the safer option.
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Breana
11 months ago
B) But wouldn't adding all prefixes that R1 is advertising to the prefix list also work?
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Annice
11 months ago
A) The neighbor requires a soft reconfiguration, and this will clear the policy without resetting the BGP TCP connection.
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