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Exam 3V0-21.21 topic 1 question 87 discussion

Actual exam question from VMware's 3V0-21.21
Question #: 87
Topic #: 1
[All 3V0-21.21 Questions]

A new real-time financial service application is being developed by the engineering team at a financial firm and will be released as a public Software-as-a-Service
(SaaS) offering. The solutions architect has designed and deployed a new vSphere environment and the supporting network infrastructure for hosting all public services. ESXi hosts are configured to use Precision Time Protocol (PTP) and a local stratum-1 network time server. Application provisioning and scaling will be managed by VMware vRealize Automation and can be run on Microsoft Windows or multiple distributions of Linux.
Which three recommendations should the architect include in the design to ensure that the service maintain timekeeping within an accuracy of one second?
(Choose three.)

  • A. Use Microsoft Windows Server as the guest operating system.
  • B. Configure the chrony time-sync agent on each virtual machine guest operating system.
  • C. Set the virtual hardware device to use Host System Time (NTP) for each virtual machine running the application.
  • D. Add a precision clock virtual device to each virtual machine running the application.
  • E. Use a Linux distribution as the guest operating system.
  • F. Add a virtual watchdog timer (VWDT) device to each virtual machine running the application.
Show Suggested Answer Hide Answer
Suggested Answer: ABC 🗳️
by lobana at June 22, 2021, 6:05 a.m.

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primanturin
Highly Voted 2 years, 9 months ago
I think B, D, E References: https://blogs.vmware.com/apps/2021/04/lets-be-precise-enabling-and-configuring-precision-time-protocol-in-vsphere.html https://core.vmware.com/blog/introducing-ptpvmw-new-linux-driver-achieve-high-time-synchronization-accuracy https://blogs.vmware.com/apps/2020/09/ensuring-accurate-time-keeping-in-virtualized-active-directory-infrastructure.html
upvoted 14 times
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Mariosoftnet
Highly Voted 2 years, 5 months ago
Checked in the VMware course training, correct answer is BDE Page 292 of the manual states: Precise timekeeping is requirement for many applications such as financial applications. Requirements: Linux VM, chrony agent, Precision clock device. Virtual watchdog is used to detect and recover from OS problems
upvoted 7 times
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Alchot
Most Recent 1 year, 2 months ago
Selected Answer: BDE
Check course page 292 as Mariosoftnet commented.
upvoted 1 times
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VCIX
1 year, 7 months ago
It’s BDE. This link details configuring VMware tools however that’s not an answer option here however configuring chrony agent is an option which is only available on Linux and that’s an alternative to VMware tools so that means it must be Linux OS https://blogs.vmware.com/apps/2021/04/lets-be-precise-enabling-and-configuring-precision-time-protocol-in-vsphere.html
upvoted 1 times
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VCIX
1 year, 7 months ago
NOT C as hosts use PTP and therefore: ‘The PTP and the NTP services cannot run simultaneously. Stop the NTP service and then enable the PTP service. Additionally, when you enable the PTP service, the manual time configuration becomes inactive.’
upvoted 1 times
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PSE_IT
1 year, 8 months ago
Selected Answer: BDE
I think B, D, E References: https://blogs.vmware.com/apps/2021/04/lets-be-precise-enabling-and-configuring-precision-time-protocol-in-vsphere.html https://core.vmware.com/blog/introducing-ptpvmw-new-linux-driver-achieve-high-time-synchronization-accuracy https://blogs.vmware.com/apps/2020/09/ensuring-accurate-time-keeping-in-virtualized-active-directory-infrastructure.html
upvoted 2 times
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ss160700
2 years, 7 months ago
A B E Chrony, windows and linux
upvoted 1 times
mnq59986
2 years, 1 month ago
Chrony is not (yet) supported on Windows
upvoted 1 times
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Helpinghanditexams
2 years, 7 months ago
Correct Answer : ABC
upvoted 1 times
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cloudsinair
2 years, 8 months ago
There is nothing to do with Windows/Linux OS. The application can be installed on either OS (Windows/Linux). The OS needs to be time synced. So I believe that A and E are ruled out and BCD seems to be the correct answer.
upvoted 1 times
JLF_VMW
2 years, 8 months ago
But with this reference: https://blogs.vmware.com/apps/2021/04/lets-be-precise-enabling-and-configuring-precision-time-protocol-in-vsphere.html you can use NTP or PTP and in the question talk about PTP, check reference of primanturin
upvoted 1 times
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roninby
2 years, 9 months ago
I'll choose B,C,D
upvoted 1 times
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lobana
2 years, 10 months ago
After re-read question one more time - we need accuracy 1 second (so NTP accuracy enough to acheive the goal) - B,D,E
upvoted 6 times
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lobana
2 years, 10 months ago
Looks like A,D,E
upvoted 3 times
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