Discuss Nokia 4A0-112 Exam Topic 4 Question 4

Consider the exhibit.

All routers are running IS-IS with IPv6 support enabled. Based on the topology shown, and the route tables of routers R3 and R4, which of the following statements is TRUE?

AThere is no route leaking configured on router R1 or router R2.

BRoute leaking is configured on router R1 but not on router R2.

CRoute leaking is configured on router R2 but not on router R1.

DRoute leaking is configured on both routers R1 and R2.

Suggested Answer: D

From the route tables of R3 and R4, we can see that remote routes are present, with R3 and R4 both having routes referencing routers in different areas (Area 49.01 and 49.02). These remote routes are characteristic of route leaking, which is the process of sharing routes between different IS-IS areas.

R3 has routes for R1, R2, and R4, which are in Area 49.01, suggesting that R1 and R2 have advertised their routes to R3, possibly due to route leaking.

R4 has similar routes for R2 and R3, indicating that R2 might have advertised its routes to R4.

This sharing of routes between areas is indicative of route leaking being configured on both R1 and R2, allowing these routes to be shared across the areas.

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26 comments · newest first

Alisha 11 months ago

Wait, are we sure about A? That seems too simple!

Allene 11 months ago

D is just wrong, both routers are clean!

Sherita 11 months ago

C seems unlikely, I doubt R2 has any leaks.

Jamie 11 months ago

I think B could be right, but I’m not sure.

Helaine 12 months ago

A is definitely true, no leaks on R1 or R2.

Maile 12 months ago

I feel like option A could be the right answer since it mentions no route leaking, but I need to double-check the route tables again.

Kenia 1 year ago

If I recall correctly, route leaking means that routes from one area can be shared with another. I just can't remember if it applies to both routers here.

Leigha 1 year ago

I think I saw a similar question in our practice tests where we had to identify route leaking configurations. It was tricky!

Lazaro 1 year ago

I remember studying route leaking, but I'm not entirely sure how it applies to R1 and R2 in this case.

Stephen 1 year ago

I'm not sure about this one. The topology is a bit complex, and I'm not entirely familiar with the details of IS-IS routing. I'll need to take my time and think it through step-by-step.

Roosevelt 1 year ago

Okay, I think I've got this. Based on the information provided, the correct answer is option D - route leaking is configured on both routers R1 and R2.

Buddy 1 year ago

Hmm, I'm a bit confused by the concept of route leaking. I'll need to review my notes on that before I can confidently answer this question.

Yuonne 1 year ago

This looks like a tricky question about IS-IS routing and route leaking. I'll need to carefully analyze the topology and the route tables to determine the correct answer.

Tennie 2 years ago

Come on, this is an easy one. The answer is clearly D. Why else would we have this fancy topology diagram, if not to test our route leaking knowledge?

Lenna 2 years ago

Because both routers need to have route leaking configured for the topology to work.

Josephine 2 years ago

Haha, this question is a real brain-teaser! I'm going to guess B, just to keep things interesting.

Mona 2 years ago

Hmm, this one's tricky. I'm going to go with C. Route leaking is only configured on R2, not R1.

Adolph 2 years ago

↳ replying to Mona

User3: I'm going with C. Route leaking is only configured on R2, not R1.

Princess 2 years ago

↳ replying to Mona

User2: I disagree, I believe it's D. Route leaking is configured on both R1 and R2.

Nettie 2 years ago

↳ replying to Mona

User1: I think it's A. There is no route leaking configured on either R1 or R2.

Chauncey 2 years ago

Why do you think it's D?

Lenna 2 years ago

I disagree, I believe it's D.

Laurel 2 years ago

I think the answer is D. Both routers R1 and R2 have route leaking configured, which is the only way to get the routes advertised between the two IS-IS domains.

Rutha 2 years ago

↳ replying to Laurel

Yes, that makes sense. Route leaking is necessary for the routes to be shared between the two domains.

Malika 2 years ago

↳ replying to Laurel

I agree with you, the answer is D. Both routers must have route leaking configured for the routes to be advertised between the two IS-IS domains.

Chauncey 2 years ago

I think the answer is A.

Nokia 4A0-112 Exam - Topic 4 Question 4 Discussion