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Question 46 - JN0-280 discussion

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

A.

Layer 2 networks only support a single broadcast domain.

Answers
A.

Layer 2 networks only support a single broadcast domain.

B.

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

Answers
B.

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

C.

Layer 3 networks support load balancing.

Answers
C.

Layer 3 networks support load balancing.

D.

Layer 2 networks are susceptible to loops.

Answers
D.

Layer 2 networks are susceptible to loops.

Suggested answer: C, D

Explanation:

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.

asked 10/10/2024
Jeonghoon Park
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