Juniper Exam JN0-280 Topic 4 Question 4 Discussion

Actual exam question for Juniper's JN0-280 exam

Question #: 4
Topic #: 4

[All JN0-280 Questions]

You are creating an IP fabric underlay and want to use OSPF as your routing protocol.

In this scenario, which statement is correct?

AAll leaf devices must be configured in separate OSPF areas.

BAll leaf and spine devices must be the same model to ensure the proper load-balancing behavior.

CInterface speeds should be the same throughout the fabric to ensure that all links are utilized.

DAll spine devices must use the same router ID.

Show Suggested Answer

Suggested Answer: C

When creating an IP fabric underlay using OSPF as the routing protocol, consistent interface speeds are important to ensure optimal traffic distribution and utilization of all links.

Step-by-Step Breakdown:

OSPF and Interface Speeds:

OSPF calculates the cost of a link based on its bandwidth. The default cost calculation in OSPF is:

If interface speeds vary significantly, OSPF may choose paths with lower cost (higher bandwidth), resulting in some links being underutilized.

Equal Utilization:

To ensure that all links are equally utilized in an IP fabric, it is recommended to maintain uniform interface speeds across the fabric. This ensures balanced load sharing across all available paths.

Juniper Reference:

IP Fabric with OSPF: Juniper recommends consistent interface speeds to maintain even traffic distribution and optimal link utilization in IP fabric underlay designs.

by Shaquana at Oct 18, 2024, 04:46 PM

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Cecily

28 days ago

Seriously, who comes up with these trick questions? I'm just going to go with my gut and choose C. Uniform interface speeds seem like the way to go.

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Son

10 days ago

Actually, in this scenario, all spine devices must use the same router ID. So D is the correct answer.

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Horace

13 days ago

I think C is the correct answer. Uniform interface speeds make sense for optimal utilization.

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Izetta

1 months ago

This is a tricky one, but I'd say the correct answer is D. Having the same router ID for all spine devices is crucial for OSPF.

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Mammie

1 months ago

I'm going with option A. Separating the leaf devices into different areas makes the most sense for scalability.

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Lisha

21 hours ago

It's important to consider scalability when designing the IP fabric underlay.

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Nieves

7 days ago

I agree, having all leaf devices in separate OSPF areas can improve network performance.

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Daniela

13 days ago

Option A is a good choice. It helps with scalability by separating the leaf devices into different areas.

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Belen

1 months ago

Haha, option B is a joke, right? Like, who would really think you need the same device models for load-balancing in OSPF?

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Ressie

2 months ago

Option C sounds good to me. Matching interface speeds will ensure optimal load-balancing in the fabric.

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Remona

14 days ago

Yes, matching interface speeds will definitely help with efficient utilization of all links in the fabric.

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Blondell

15 days ago

It's important to have consistent speeds to prevent any bottlenecks in the network.

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Alise

18 days ago

I agree, having the same interface speeds will help distribute traffic evenly across the fabric.

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Fannie

1 months ago

Option C sounds good to me. Matching interface speeds will ensure optimal load-balancing in the fabric.

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Desirae

2 months ago

I disagree, I believe the correct statement is D) All spine devices must use the same router ID. This ensures consistency in the network.

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Mammie

2 months ago

I think the correct statement is A) All leaf devices must be configured in separate OSPF areas.

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Alona

2 months ago

I think option D is correct. All spine devices should use the same router ID for OSPF to work properly.

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Mi

25 days ago

C) Interface speeds should be the same throughout the fabric to ensure that all links are utilized.

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William

26 days ago

B) All leaf and spine devices must be the same model to ensure the proper load-balancing behavior.

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Corazon

1 months ago

A) All leaf devices must be configured in separate OSPF areas.

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