Nokia 4A0-105 Exam - Topic 7 Question 118 Discussion

Actual exam question for Nokia's 4A0-105 exam

Question #: 118
Topic #: 7

What is the name of the feature supported on the Alcatel-Lucent 7750 SR that prevents MAC explosion in large VPLS deployments?

AH-VPLS

BM-VPLS

CPBB

DMC-EP

Show Suggested Answer

Suggested Answer: C

by Oretha at Nov 24, 2025, 07:40 PM

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Rashida

1 month ago

I’m leaning towards H-VPLS too. It’s crucial for large networks.

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Halina

2 months ago

PBB could be a contender, but it’s not the main focus here.

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Mammie

2 months ago

Not so sure about H-VPLS. What about M-VPLS?

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Marshall

2 months ago

I agree, H-VPLS seems right. Prevents MAC issues.

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Sherell

2 months ago

I think it's H-VPLS. It helps with scalability.

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Odette

2 months ago

Are we sure it's not PBB? Seems like a valid option too.

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Alline

2 months ago

Wait, I didn't know MAC explosion was a thing!

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Luisa

3 months ago

Definitely H-VPLS, no doubt about it.

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Carlota

3 months ago

I thought it was M-VPLS?

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Charlie

3 months ago

It's H-VPLS for sure!

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Rex

4 months ago

B) M-VPLS? More like M-VPLS (Mess-VPLS), if you ask me.

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Avery

4 months ago

A) H-VPLS? More like H-VPLS (Headache-VPLS), am I right?

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Garry

4 months ago

D) MC-EP is the way to go. Keeps those MACs in check, you know?

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Sharika

4 months ago

C) PBB is the correct answer. It prevents MAC explosion in large VPLS deployments.

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Jannette

4 months ago

MC-EP sounds familiar, but I can't recall its exact function. I feel like I need to review the differences between these options again.

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Portia

4 months ago

I’m leaning towards PBB, but I’m not confident. I know it relates to bridging, but I can’t connect it to VPLS directly.

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Dottie

5 months ago

I recall studying M-VPLS, but I can't remember if that was specifically for MAC explosion prevention. It feels like a similar question we practiced.

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Lashawna

5 months ago

I think it might be H-VPLS, but I'm not entirely sure. I remember it had something to do with hierarchical structures.

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Ah yes, I remember this now! It's C) PBB, the Provider Backbone Bridging feature. That's the one that helps prevent MAC address table explosion in large VPLS deployments. Feeling good about that answer.

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Kimbery

5 months ago

Okay, let me see. I remember learning about this in class. I think it's D) MC-EP, but I'm not 100% confident. Gonna go with that for now.

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Joseph

5 months ago

Ugh, I'm drawing a blank on this. VPLS and MAC explosion - I know there's a feature for that, but I can't remember the name. Guess I'll have to take a guess.

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