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Exam 3V0-21.21 All Questions

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Exam 3V0-21.21 topic 1 question 37 discussion

Actual exam question from VMware's 3V0-21.21
Question #: 37
Topic #: 1
[All 3V0-21.21 Questions]

An architect is tasked with designing a greenfield VMware software-defined data center (SDDC) solution that will be used to deliver a private cloud service for a customer.
During the initial meeting with the service owner and business sponsor, the customer has provided the following information to help inform the design:
✑ The solution must support the concurrent running of 1,000 virtual machines
✑ The production environment must be delivered across two geographically dispersed data centers
✑ All virtual machines must be capable of running in either data center.
✑ The two data centers are currently connected to each other through a single but diversely routed, high bandwidth and low latency link.
✑ The link between the two data centers is capable of supporting a round-trip time (RTT) of 150 ms
✑ The existing server hardware standard document states that all virtual infrastructure hosts must be deployed using vSAN ReadyNodes
✑ The service owner has stated that it is critical to ensure the availability target of 99.9%
✑ All virtual machine backups must be completed using the existing backup service
✑ The recovery time objective (RTO) for the service is five minutes
✑ The recovery point objective (RPO) of the service is four hours
Which two elements represent risks to the successful delivery of this solution? (Choose two.)

  • A. The use of only two data centers
  • B. The network connectivity between data center sites
  • C. The use of vSAN ReadyNodes
  • D. The RTT on the link between the two data centers
  • E. The use of the existing backup service
Show Suggested Answer Hide Answer
Suggested Answer: BE 🗳️

Comments

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estornudo
Highly Voted 3 years, 7 months ago
I'd say risks are B and E B because it has a single link between sites E because existing backup service may not be OK wit such as low RPO and RTO requirements
upvoted 16 times
Alchot
1 year, 9 months ago
Then E is an assumption to be OK or not OK and can turn into a risk at the same time. E because existing backup service may not be OK wit such as low RPO and RTO requirements Without making assumptions BD are more accurate. Single link. Risk of SPOF Latency can break some applications to run from either site and even the cluster performance.
upvoted 1 times
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amgice
Highly Voted 3 years, 7 months ago
A - for strech cluster need a witness site too D - RTT needs to be less than 5ms betwen sites
upvoted 6 times
mvojka1990
2 years, 7 months ago
VM running in either DC, not across DCs, so no need for stretched cluster, ok its SDDC but not stretched SDDC clusters mentioned, and also no need for a Witness 3rd site. RTT 150 is OK, because its capable to run long-distance vmotion, so, one risk is having existing backup service because you have aggressive RPO RTO with a lot of VMs and you will be not sure if its capable to run the new SDDC platform, and also if that single link goes down you lose site connection . Final answer B,E.
upvoted 6 times
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FR_Wolfman
Most Recent 10 months, 1 week ago
Selected Answer: BE
Answer is B & E A >> The SLA can be achieve with only 2 datacenters. There is no risk B >> We have a SPOF here due to the single link. It is a risk. C >> The use of vSAN ReadyNodes is a constraint, not a risk D >> The RTT is not a risk. It may be constraint, as a 150ms RTT latency will exclude the option to deploy a vSAN Stretched Clusters E >> The existing backup service may not be able to reach the required RTO/RPO. It is a risk
upvoted 1 times
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83f7706
11 months ago
B+D 150 RTT it is risk for 1000 (10+ESXi hosts) https://docs.vmware.com/en/VMware-vSphere/7.0/vsan-network-design-guide/GUID-F3401655-6EFA-477B-B072-E8F001B50BCC.html
upvoted 1 times
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LFC1280
1 year, 2 months ago
Selected Answer: BD
I'd go with B and D. B: Single link is a clear risk of SPOF. D: The latency may not allow to comply with the RPO and RTO requirements. It is stated that the Intersite Link has high bandwidth and low latency link, but then it says that is capable of supporting RTT of 150 ms. Despite being intentionally confusing, there is a latency number (exact one) which could not satisfy a RPO of 5 minutes for a 1000 VMs. That is the risk. The fact that we are forced to use the existing backup solution is not a risk per se, but a constraint. Sounds good?
upvoted 1 times
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andr3
1 year, 5 months ago
The network connectivity between data center sites & The RTT on the link between the two data centers
upvoted 1 times
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diegof1
1 year, 10 months ago
Selected Answer: BD
B & D B: Because the two data centers are currently connected to each other through a single but diversely routed D: Because the RTT on the link between the two data centers is 150 ms and the requirement for vSAN stretched cluster is 5ms between sites. Using vSAN stretched cluster should be the best design for all requirements
upvoted 4 times
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diegof1
1 year, 10 months ago
B & D B: Because the two data centers are currently connected to each other through a single but diversely routed D: Because the RTT on the link between the two data centers is 150 ms and the requirement for vSAN stretched cluster is 5ms between sites. Using vSAN stretched cluster should be the best design for all requirements https://docs.vmware.com/en/VMware-vSphere/7.0/com.vmware.vsphere.vsan-planning.doc/GUID-AFF133BC-F4B6-4753-815F-20D3D752D898.html
upvoted 1 times
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PSE_IT
2 years, 3 months ago
Selected Answer: BE
totally agree with estornudo B because it has a single link between sites E because existing backup service may not be OK wit such as low RPO and RTO requirements
upvoted 2 times
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Tabordens
2 years, 10 months ago
Selected Answer: BE
B and E
upvoted 3 times
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Mezze
2 years, 11 months ago
I think that A & D correct.
upvoted 1 times
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cib28
3 years, 2 months ago
B and E not D because RTT is 150 ms; it'ok ok for Long Distance vMotion https://kb.vmware.com/s/article/2106949
upvoted 1 times
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zhongzhong5011
3 years, 2 months ago
REQ: VSAN RPO RTO CONS: RTT:is not match the require 2site:3needed BACKUP hradware: CONS RISK : sigle point \ BACKUP'S policy SO BE
upvoted 1 times
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primanturin
3 years, 2 months ago
B and E I do not really see in the question any mention about vSAN stretched cluster. Anyway, I believe it can be discarded because of the RTO and RPO requirements. A vSAN stretched cluster achieves an RPO of 0 and a very low RTO https://blogs.vmware.com/virtualblocks/2017/02/09/vsan-srm-rpo-rto/ B - Single link between sites - Risk E - The existing backup service might not be able to accomplish such a low RTO and RPO requirements - Risk Obviously, if they were talking about a vSAN stretched cluster, the answer would have been A and D.
upvoted 4 times
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lifeflakes
3 years, 3 months ago
considering that this is not a Zero RPO, but 4 hours of RPO, is clearly not a vSAN stretched cluster requirement. Also with vSphere 6.0 Long-distance vMotion, the round-trip latency limit for vMotion networks is up to 150 milliseconds. I would go with B & E.
upvoted 2 times
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JLF_VMW
3 years, 3 months ago
This question generates doubts because if you gonna work with vsan Stretched Cluster, the answer is A and D, BUT, ¿where it says you should work with Stretched Cluster?
upvoted 1 times
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cyberwookie
3 years, 4 months ago
Single Link = Risk Existing Backup: Is RTO/RPO still achievable? Dunno, Risk
upvoted 2 times
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A (35%)
C (25%)
B (20%)
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