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Exam 2V0-21.19 All Questions

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Exam 2V0-21.19 topic 1 question 108 discussion

Actual exam question from VMware's 2V0-21.19
Question #: 108
Topic #: 1
[All 2V0-21.19 Questions]

A VM is experiencing inconsistent network connectivity between two ESXi hosts connecting to the same physical switches. The effect of the inconsistency is this:
✑ vMotion from host 1 to host 2, network connection is down
✑ vMotion from host 2 to host 1, network connection is up
✑ vMotion from host 1 to host 2, network connection is up
The vSphere administrator wants to ensure the physical switches connecting to the ESXi are configured correctly.
How can this be accomplished?

  • A. Use Network Health Check to verify the VLAN trunks on VSS
  • B. Use vSphere Health Check to verify on MTU settings on VDS
  • C. Use Network Health Check to verify the VLAN trunks on VDS
  • D. Use Network Health Check to verify MTU settings on VSS
Show Suggested Answer Hide Answer
Suggested Answer: D 🗳️
by Grande at Oct. 8, 2019, 7:21 a.m.

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Grande
Highly Voted 5 years, 8 months ago
https://docs.vmware.com/en/VMware-vSphere/6.7/com.vmware.vsphere.networking.doc/GUID-4A6C1E1C-8577-4AE6-8459-EEB942779A82.html https://www.vladan.fr/vsphere-network-health-check/ Network Health Check feature is a VDS thing I cannot validate that VSS supports this feature Answer is B
upvoted 12 times
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metapedro
Highly Voted 5 years, 4 months ago
Correct answer C. Checked in exam.
upvoted 12 times
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HN6366
Most Recent 4 years, 3 months ago
C is correct. https://kb.vmware.com/s/article/2140503
upvoted 4 times
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will_h
4 years, 6 months ago
The answer should be B. MTU may causes a NIC flaps. https://www.nukescloud.com/post/2017/12/18/changing-mtu-value-to-causes-vmnic-to-flap
upvoted 1 times
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sasaz
4 years, 10 months ago
C. 1. No Network Health Check for VSS, A and D out. 2. No such feature named 'vSphere Health Check' on neither VSS or VDS. B out. 3. Network Health Check is available for VDS. And VLAN is a Port Group (PG) based concept, may VMs belong to different PG (with different VLANs) thus sometime vMotion works, sometime doesn't (cannot migrate VM's network setting/PG).
upvoted 3 times
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Aolivera
4 years, 10 months ago
A and D cannot be as health check is a DVS feature https://docs.vmware.com/en/VMware-vSphere/6.7/com.vmware.vsphere.networking.doc/GUID-4A6C1E1C-8577-4AE6-8459-EEB942779A82.html B is not as feature name does not exist, it only leaves C as a possible answer. Question boils down to what feature can be applied to what vSwitch
upvoted 3 times
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bdsaifcse
4 years, 10 months ago
The correct answer is B
upvoted 2 times
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alanp
4 years, 11 months ago
MTU and VLAN are correct for "network health check". but B says "vSphere Health Check" my thoughts
upvoted 1 times
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vs2
4 years, 11 months ago
B: https://docs.vmware.com/en/VMware-vSphere/6.7/com.vmware.vsphere.networking.doc/GUID-6D155482-0743-4252-A8DC-3F608AB3654A.html
upvoted 2 times
[Removed]
4 years, 6 months ago
Yes, this link nails it. MTU is often a root cause of issues and vSphere Online Health Check is the tool to use. Going with B
upvoted 1 times
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sat123
5 years, 1 month ago
C is the answer , coz network health check available only in VDS .
upvoted 2 times
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NongNong
5 years, 1 month ago
Metapedro, here he is again commenting checked in exam.
upvoted 5 times
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Rass2
5 years, 1 month ago
Correct answer C. Checked in egzam.
upvoted 4 times
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Rabbit117
5 years, 1 month ago
I think the answer is B. If the VLAN was incorrect it would never work, so thats A and C out. Network Health Check is only available for VDS, so thats D out. vSphere Health check checks the vMotion network configuration for VDS which checks the MTU settings. So I think the answer is B.
upvoted 4 times
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GPunk
5 years, 1 month ago
B. Use vSphere Health Check to verify on MTU settings on VDS im not sure but "B" might be the correct answer. but... Health Check feature check the VLAN trunking as well as MTU consistency, so if the MTU for vMotion configured to be large then what what the MTU size of one of physical switch configured then Packets will be drop! so the vMotion operation will failed , so its could be the problem but... What if there is flapping network cable or pNIC load is to high?
upvoted 2 times
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Slawister
5 years, 3 months ago
Network Health Check can be enabled only on VDS. So only B and C can be correct. If the VLAN trunks are wrong configured then connection is not possible at all (in the question is information that connection is restored) So it has to be wrong MTU size.
upvoted 2 times
redondo310
5 years, 3 months ago
Ill just point out that it does say "switch(s)". One switch can be configured correctly and the other switch could be configured wrong. The network health checks do verify the vlan tags coming from the switch, match what is tagged at the port groups. The only other thing i keep looking at is answer B says "vSphere Health Check" and C says "Network Health Check". The MTU setting would be part of the Network Health Check I would think.
upvoted 3 times
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s8y
5 years, 3 months ago
B =correct. it can't be vlan trunking. If there was no correct vlan allowed on the switch there would be no network connectivity at all and behavior would be consistent, there is to health check on vss so no other answer left but B.
upvoted 2 times
redondo310
5 years, 3 months ago
Wait... The question does say network "switches". NLB could be causing the mixed result. Answers A/D are out. Since MTU is a setting configured at the root vDS level and vlan trunking is configured per port group. I am going to go with answer C on this one since a 2 vms could be in 2 different port groups and one of the groups are misconfigured. Just me take...
upvoted 1 times
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Vinythepat
5 years, 3 months ago
The connection is intermittent. Only VDS has network health check feature, VSS don't, so clearly you can eliminate VSS answers. Issue here is not vSphere at all, its network so that eliminate vSphere health check answer and that leaves Ans C.
upvoted 2 times
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