Cisco 300-510 Exam - Topic 8 Question 119 Discussion

Actual exam question for Cisco's 300-510 exam

Question #: 119
Topic #: 8

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?

AR2(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

DR2(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

CR1(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

BR2(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

Show Suggested Answer

Suggested Answer: C

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

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Katina

4 days 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

10 days 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

1 month 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

1 month 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

1 month 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

2 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

2 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

2 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

2 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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