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Cisco 300-510 Exam - Topic 8 Question 119 Discussion

Refer to the exhibit.An engineer is troubleshooting IS-IS configuration between two areas. IS-IS Area-A network 30.1.1.0/24 is leaked into IS-IS Area-. R2 is failing to filter the route updates from network 10.1.1.0/24. Which configuration must the engineer apply to resolve the issue?
C) R1(config)# ip prefix-list List2 seq 5 deny 10.1.1.0/24 R1(config)# interface fastethernet 0/0 R1(config-if)# ip router isis 100 R1(config-if)# router isis 100 R1(config-router)# distribute-list gateway List2 in R (config-if)# router isis 150 R1(config-router)# distribute-list route-map Map1 in
A) R2(config)# ip prefix-list List2 seq 5 deny 10.1.1.0/24 R2(config)# interface fastethernet 0/0 R2(config-if)# ip router isis 100 R2(config-if)# router isis 100 R2(config-router)# distribute-list gateway List2 in
D) R2(config)# access-list 101 deny ip any 10.1.1.0 0.0.0.127 R2(config)# access-list 101 permit ip any 30.1.1.0 0.0.0.63 R2(config)# access-list 101 deny ip any 0.0.0.0 0.0.0.0 R2(config)# interface fastethernet 0/0 R2(config-if)# ip router isis 121 R2(config-if)# router isis 121 R2(config-router)# distribute-list 101 in
B) R2(config)# ip prefix-list List1 seq 3 deny 10.1.1.0/24 R2(config)# ip prefix-list List1 seq 5 permit 30.1.1.0/24 ge 25 1e R2(config)# ip prefix-list List1 seq 10 permit 0.0.0.0/le 32 R2(config)# interface fastethernet 0/0 R2(config-if)# ip router isis 122 R2(config-if)# router isis 122 R2(config-router)# distribute-list prefix List1 in

Cisco 300-510 Exam - Topic 8 Question 119 Discussion

Actual exam question for Cisco's 300-510 exam
Question #: 119
Topic #: 8
[All 300-510 Questions]

Refer to the exhibit.

An engineer is troubleshooting IS-IS configuration between two areas. IS-IS Area-A network 30.1.1.0/24 is leaked into IS-IS Area-. R2 is failing to filter the route updates from network 10.1.1.0/24. Which configuration must the engineer apply to resolve the issue?

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Suggested Answer: C

by Alex at Jan 26, 2026, 07:42 PM

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Ernie
2 months ago
I’m leaning towards using distribute-list. Seems like a solid option to control updates.
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Lavonda
2 months ago
I agree, but what about prefix lists? They could also work for this issue.
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Fidelia
2 months ago
I think using a route map could help. It might filter the updates correctly.
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Maryann
2 months ago
This question is tricky. I feel unsure about the filtering part.
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Wilson
2 months ago
I thought IS-IS handled this automatically?
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Carma
4 months ago
Just need to adjust the route map on R2.
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William
4 months ago
Wait, is R2 really not filtering? That seems odd.
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Noemi
4 months ago
Totally agree, filtering is key here.
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Louvenia
4 months ago
The issue is likely due to route leaking.
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Nida
5 months ago
Haha, the engineer's got their work cut out for them. Gotta keep those IS-IS areas nice and tidy, no leaks allowed!
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Casie
5 months ago
Wait, is the answer "filter the route updates from network 10.1.1.0/24"? I'm just asking, not trying to be funny or anything.
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Julie
5 months ago
Hmm, the engineer needs to find a way to stop that 10.1.1.0/24 network from leaking into the other area. Gotta keep those routes contained!
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Loise
5 months ago
I'd suggest checking the IS-IS configuration on R2 and making sure the route filtering is set up correctly.
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Jaime
5 months ago
Looks like the issue is with the route updates from network 10.1.1.0/24. The engineer needs to apply the right configuration to filter those updates.
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Lezlie
5 months ago
The engineer should configure route filtering on R2 to prevent the leakage of network 10.1.1.0/24 into Area-B.
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Katina
6 months ago
I think we need to look at the IS-IS level configuration. Maybe adjusting the level of the route could help?
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Martina
6 months ago
I feel like I might have seen a command that could help with filtering, but I can't recall it exactly.
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Bronwyn
7 months ago
This seems similar to a practice question we did on route leaking. I think we need to check the route map configuration.
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Altha
7 months ago
I remember something about route filtering in IS-IS, but I'm not sure how to apply it in this scenario.
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Amina
7 months ago
Ah, I see the issue now. The key is that the 10.1.1.0/24 network is being leaked from Area-A into Area-. The engineer needs to configure R2 to filter those route updates. I'll work through the specific configuration steps to resolve this.
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Aimee
7 months ago
This seems straightforward - the engineer just needs to configure R2 to filter the route updates from the 10.1.1.0/24 network that is being leaked from Area-A. I'll focus on identifying the right configuration commands to apply on R2.
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Norah
7 months ago
I'm a bit confused by the specifics of the IS-IS configuration and how the areas are set up. I'll need to refresh my knowledge on IS-IS before I can confidently approach this question.
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Colene
7 months ago
Okay, the key seems to be that the engineer needs to apply a configuration to R2 to resolve the issue with the leaked route from Area-A. I'll need to consider the IS-IS area boundaries and route filtering options.
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Son
8 months ago
Hmm, this looks like a tricky IS-IS routing issue. I'll need to carefully review the exhibit and think through the possible configuration changes to filter the route updates.
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Oretha
1 month ago
Maybe adding a prefix-list could help too.
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Tamesha
1 month ago
Agreed, we should check the route maps.
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Audry
1 month ago
I think the route filtering needs to be adjusted.
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