VMware 5V0-21.21 Exam - Topic 4 Question 75 Discussion

Actual exam question for VMware's 5V0-21.21 exam

Question #: 75
Topic #: 4

As a part of a network hardware refresh project, all the network switches have been replaced with a newer, high-performance model. After the replacement, the company users started experiencing slowness on the applications hosted on their vSAN-backed VMs.

The vSAN administrator checked the vSAN Network Health status and noticed that the "Hosts large ping test" has failed.

What could be the cause of this performance degradation issue?

AMTU 9K is not configured on the hosts vSAN vMKernel ports.

BMTU 9K is not configured on the hosts VMnic ports.

CMTU 9K is not configured on the ToR switch.

DMTU 9K is not configured on the vDS switch.

Show Suggested Answer

Suggested Answer: C

https://kb.vmware.com/s/article/2108285

by Ressie at Dec 07, 2024, 02:04 AM

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Ronny

3 months ago

Wait, are we sure it's not a different problem?

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Judy

3 months ago

I agree, it's probably the vDS switch.

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Octavio

3 months ago

I thought the vSAN would handle that automatically?

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Shenika

4 months ago

Definitely check the ToR switch settings!

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Lasandra

4 months ago

Sounds like a classic MTU issue.

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Tennie

4 months ago

I’m leaning towards the vDS switch configuration being the issue. I recall a case study where mismatched MTU settings caused major slowdowns.

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Cecilia

4 months ago

I think it could also be related to the VMnic ports. I remember reading that if those aren't set correctly, it can impact performance too.

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Flo

4 months ago

I'm not entirely sure, but I feel like the ToR switch MTU configuration might be the key here. We had a similar question about switch settings last week.

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Julieta

5 months ago

I remember we discussed MTU settings in class, and I think if the vSAN vMKernel ports don't have MTU 9K configured, it could definitely cause issues.

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Malcolm

5 months ago

I'm a bit unsure here. Could be the vDS switch, the VMnic ports, or the vSAN vMKernel ports that need the 9K MTU. I'll have to think through the network topology to determine the most likely culprit.

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Art

5 months ago

Okay, this seems straightforward. The new network switches were installed, so the MTU configuration must not have been updated properly. I'll go with option C - the ToR switch needs the 9K MTU set.

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Ozell

5 months ago

Hmm, the "Hosts large ping test" failing points to a network problem. I'm guessing it's either the vSAN vMKernel ports or the ToR switch that needs the 9K MTU configured.

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Tricia

5 months ago

This looks like a networking issue related to the MTU configuration. I'll need to carefully review the options and think through the vSAN network setup to determine the most likely cause.

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