Nokia 4A0-112 Exam - Topic 2 Question 2 Discussion

Actual exam question for Nokia's 4A0-112 exam

Question #: 2
Topic #: 2

When using IS-IS in native mode for routing in a dual-stack IPv4/IPv6 environment, which of the following statements is FALSE?

AAll links are assumed to be IPv4- and IPv6-capable.

BThe same topology information is used to calculate the shortest path tree for both IPv4 and IPv6.

CIn a multi-area environment, the SPF algorithm needs to be run four times on each L1/L2 router.

DIt may lead to traffic black-holing if not properly designed.

Show Suggested Answer

Suggested Answer: C

In a dual-stack IPv4/IPv6 IS-IS environment, the SPF (Shortest Path First) algorithm is only run once per router for each protocol (IPv4 or IPv6). The topology is shared, but the SPF calculations for IPv4 and IPv6 are separate. This means that the SPF algorithm will run twice (once for IPv4 and once for IPv6) for each L1/L2 router, not four times.

by Gregoria at Jan 25, 2025, 06:06 PM

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Brendan

3 months ago

D is definitely a risk if the design isn't solid.

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Herschel

3 months ago

Wait, four times for SPF? That seems excessive!

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Annita

3 months ago

B makes sense, same topology for both protocols.

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Elmer

4 months ago

I think C is the false one, sounds off.

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Elza

4 months ago

A is true, all links are IPv4 and IPv6 capable.

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Maurine

4 months ago

Option D seems plausible since traffic black-holing can happen in complex setups, but I’m not confident about the specifics.

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Omer

4 months ago

I feel like I’ve seen a question similar to this before, and it was about the SPF algorithm, so I’m leaning towards option C being false.

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Abel

4 months ago

I remember discussing how IS-IS handles both IPv4 and IPv6, so maybe option A is the false one?

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Stephane

5 months ago

I think option C sounds a bit off, but I'm not entirely sure why it needs to run four times.

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Dan

5 months ago

I remember learning about this in class. I'm pretty sure the correct answer has to do with the number of times the SPF algorithm needs to be run.

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Lina

5 months ago

Okay, let me break this down step-by-step. I think the key is understanding how IS-IS calculates the shortest path tree for both IP versions.

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Shizue

5 months ago

Hmm, I'm a little unsure about the details of how IS-IS handles dual-stack IPv4/IPv6. I'll need to think this through carefully.

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Lino

5 months ago

This question seems pretty straightforward. I'm pretty confident I can figure this out.

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Beckie

1 year ago

I think the answer is B because the same topology information is used for both IPv4 and IPv6.

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Loren

1 year ago

I'm not sure, but I think the answer is A.

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Ronnie

1 year ago

I disagree, I believe the answer is D.

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Milly

1 year ago

I got a headache just reading this question. Maybe I should've stuck to IPv4-only networks, where things are much simpler.

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Elliot

1 year ago

Woah, this is some next-level stuff! I'm just hoping I don't accidentally end up in an IPv6 black hole during the exam.

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Charlena

1 year ago

User 2: Yeah, you definitely don't want to end up in a traffic black hole.

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Delmy

1 year ago

User 1: Don't worry, just remember to properly design your network.

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Jospeh

1 year ago

Option D sounds the most plausible. Improper design can definitely lead to traffic black-holing in a dual-stack environment.

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Barrett

1 year ago

This question is a real brainteaser! I'm not sure if I agree with any of the answer choices. Maybe they're all false?

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Anna

1 year ago

User 2: I agree, all links are assumed to be IPv4- and IPv6-capable.

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Rosio

1 year ago

User 1: I think option A is true, not false.

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Jina

1 year ago

I think option C is false. The SPF algorithm needs to be run only twice, once for IPv4 and once for IPv6.

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Deja

1 year ago

C) In a multi-area environment, the SPF algorithm needs to be run four times on each L1/L2 router.

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Sherill

1 year ago

B) The same topology information is used to calculate the shortest path tree for both IPv4 and IPv6.

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Gracia

1 year ago

A) All links are assumed to be IPv4- and IPv6-capable.

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Luis

1 year ago

I think the answer is C.

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