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Juniper JN0-281 Exam - Topic 1 Question 8 Discussion

Actual exam question for Juniper's JN0-281 exam
Question #: 8
Topic #: 1
[All JN0-281 Questions]

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

Show Suggested Answer Hide 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
2 months ago
Layer 3 networks do support load balancing, that's a big plus!
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Karol
2 months ago
Totally agree, loops in Layer 2 can be a nightmare!
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Eugene
3 months ago
Wait, are IP fabrics really that much better?
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Sena
3 months ago
IP fabrics are definitely better for scalability.
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Catrice
3 months ago
Layer 2 networks only support a single broadcast domain.
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Aileen
3 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
4 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
4 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
4 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
4 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
4 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
5 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
5 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
8 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
8 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
7 months ago
D) Layer 2 networks are susceptible to loops.
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Carma
8 months ago
A) Layer 2 networks only support a single broadcast domain.
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Na
8 months ago
I agree, IP fabrics also provide better load balancing capabilities.
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Marquetta
8 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
8 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
7 months ago
User 4: IP fabrics are much more reliable in data centers.
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Noel
7 months ago
User 3: A and D are the way to go for sure.
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Millie
7 months ago
User 2: Definitely, those loops can cause major issues.
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Malinda
7 months ago
User 1: I agree, Layer 2 networks are so outdated.
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Christiane
8 months ago
I think deploying an IP fabric is better for scalability.
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Jolanda
9 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
8 months ago
That's why deploying an IP fabric makes sense, to avoid those issues.
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Luther
8 months ago
Yeah, Layer 2 loops can be a real pain to deal with.
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Devon
8 months ago
I agree, Layer 3 networks are definitely better for load balancing.
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