Juniper JN0-281 Exam - Topic 1 Question 8 Discussion

Actual exam question for Juniper's JN0-281 exam

Question #: 8
Topic #: 1

What are two reasons why you would deploy an IP fabric instead of a traditional Layer 2 network in a data center? (Choose two.)

ALayer 2 networks only support a single broadcast domain.

BIP fabrics are better suited to smaller networks where scale is less important.

CLayer 3 networks support load balancing.

DLayer 2 networks are susceptible to loops.

Show Suggested Answer

Suggested Answer: C, D

IP fabrics are Layer 3-centric network designs often used in data centers due to their scalability, efficient routing, and loop-free architecture.

Step-by-Step Breakdown:

Layer 3 Load Balancing:

IP fabrics use Equal-Cost Multipath (ECMP) to distribute traffic across multiple paths, providing effective load balancing and improving bandwidth utilization. This capability is absent in traditional Layer 2 networks, which do not support ECMP for routing decisions.

Layer 2 Loops:

Layer 2 networks are prone to loops because of the lack of TTL (Time-to-Live) mechanisms. Spanning Tree Protocol (STP) is required to prevent loops, but it can introduce inefficiencies by blocking links. In contrast, IP fabrics based on Layer 3 protocols are loop-free and do not need STP.

Juniper Reference:

IP Fabric: Juniper's IP fabric solutions offer efficient Layer 3 routing with built-in load balancing and loop prevention, making them ideal for modern data center architectures.

by Micaela at Jun 16, 2025, 12:19 PM

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Mariko

4 months ago

Layer 3 networks do support load balancing, that's a big plus!

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Karol

4 months ago

Totally agree, loops in Layer 2 can be a nightmare!

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Eugene

4 months ago

Wait, are IP fabrics really that much better?

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Sena

4 months ago

IP fabrics are definitely better for scalability.

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Catrice

5 months ago

Layer 2 networks only support a single broadcast domain.

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Aileen

5 months ago

I vaguely recall that Layer 3 networks can help with load balancing, but I can't remember if that's a key reason for deploying an IP fabric.

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William

5 months ago

I feel like we discussed how Layer 2 networks are prone to loops, which can really mess things up in a data center.

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Audra

5 months ago

I think IP fabrics are more scalable, but I'm not sure if that's the main reason to choose them over Layer 2.

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Sol

6 months ago

I remember studying that Layer 2 networks can have issues with broadcast storms, which makes them less reliable for larger setups.

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Dalene

6 months ago

I'm pretty confident I know the answer to this one. Layer 2 networks are susceptible to loops, which can cause major issues. And IP fabrics are better suited for larger, more scalable data centers.

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Jennifer

6 months ago

Okay, I've got this. Layer 2 networks have a single broadcast domain, which can be a problem as the network grows. And IP fabrics support load balancing, which is a big advantage.

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Luisa

6 months ago

Hmm, I'm a bit unsure about this one. I know IP fabrics are more scalable, but I'm not sure about the other reasons. I'll need to think this through carefully.

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Andrew

6 months ago

This question seems straightforward. I think the key is to focus on the differences between Layer 2 and IP fabric networks.

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Fannie

9 months ago

But Layer 2 networks are more prone to loops, so that's another reason to choose IP fabric.

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Georgene

10 months ago

A and D, all the way! Layer 2 networks are like trying to herd cats, and those loops? Forget about it. IP fabrics are where it's at, my friend. Plus, they're way more fun to say. 'IP fabric' just rolls off the tongue, doesn't it?

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Truman

9 months ago

D) Layer 2 networks are susceptible to loops.

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Carma

9 months ago

A) Layer 2 networks only support a single broadcast domain.

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Na

10 months ago

I agree, IP fabrics also provide better load balancing capabilities.

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Marquetta

10 months ago

This is a tough one, but I'm gonna go with C and D. I mean, who doesn't love a good load balancing party? And those Layer 2 loops, ugh, just the thought of it makes me cringe.

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Ryan

10 months ago

Hmm, I'd go with A and D. Layer 2 networks are so 90s, and those loops can really mess up your day. IP fabrics are the way to go, no doubt about it.

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Marica

8 months ago

User 4: IP fabrics are much more reliable in data centers.

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Noel

8 months ago

User 3: A and D are the way to go for sure.

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Millie

9 months ago

User 2: Definitely, those loops can cause major issues.

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Malinda

9 months ago

User 1: I agree, Layer 2 networks are so outdated.

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Christiane

10 months ago

I think deploying an IP fabric is better for scalability.

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Jolanda

10 months ago

C and D, for sure! Layer 3 networks are way better for load balancing, and those pesky Layer 2 loops are just the worst. Who needs that headache, am I right?

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Rosina

9 months ago

That's why deploying an IP fabric makes sense, to avoid those issues.

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Luther

9 months ago

Yeah, Layer 2 loops can be a real pain to deal with.

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Devon

10 months ago

I agree, Layer 3 networks are definitely better for load balancing.

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