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Exam AZ-104 topic 3 question 27 discussion

Actual exam question from Microsoft's AZ-104
Question #: 27
Topic #: 3
[All AZ-104 Questions]

You have an app named App1 that runs on two Azure virtual machines named VM1 and VM2.
You plan to implement an Azure Availability Set for App1. The solution must ensure that App1 is available during planned maintenance of the hardware hosting
VM1 and VM2.
What should you include in the Availability Set?

  • A. one update domain
  • B. two fault domains
  • C. one fault domain
  • D. two update domains
Show Suggested Answer Hide Answer
Suggested Answer: D 🗳️
Microsoft updates, which Microsoft refers to as planned maintenance events, sometimes require that VMs be rebooted to complete the update. To reduce the impact on VMs, the Azure fabric is divided into update domains to ensure that not all VMs are rebooted at the same time.
Incorrect Answers:
A: An update domain is a group of VMs and underlying physical hardware that can be rebooted at the same time.
B, C: A fault domain shares common storage as well as a common power source and network switch. It is used to protect against unplanned system failure.
References:
https://petri.com/understanding-azure-availability-sets
https://docs.microsoft.com/en-us/azure/virtual-machines/windows/tutorial-availability-sets

Comments

Chosen Answer:
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mlantonis
Highly Voted 2 years, 10 months ago
Correct Answer: D When you create an Availability Set, the hardware in a location is divided into multiple update domains and fault domains. An update domain is a group of VMs and underlying physical hardware that can be rebooted at the same time. VMs in the same fault domain share common storage as well as a common power source and network switch. During scheduled maintenance, only one update domain is updated at any given time. Update domains aren't necessarily updated sequentially. So, we need two update domains. Reference: https://docs.microsoft.com/en-us/azure/virtual-machines/windows/tutorial-availability-sets https://docs.microsoft.com/en-us/azure/virtual-machines/manage-availability https://docs.microsoft.com/en-us/azure/virtual-machines/maintenance-and-updates
upvoted 180 times
Omar_Aladdin
2 years, 6 months ago
Planned Maintenance "FOR THE HARDWARE ((HOSTING))" I'm SURE "two fault domains" is the correct answer
upvoted 8 times
bbhagya12
2 years, 2 months ago
If it is maintinance - Update domain If it is hardware failed - Fault Domain Correct Ans is D
upvoted 36 times
Lazylinux
1 year, 9 months ago
If it is hardware failed - Fault Domain ==> Incorrect Sir => hardware failure or maintenance are same and means you lost update domain on other hand Rack failure or maintenance are FAULT DOMAINS!
upvoted 2 times
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SilverFox22
2 years, 5 months ago
"Microsoft updates, which Microsoft refers to as planned maintenance events, sometimes require that VMs be rebooted to complete the update." Planned maintenance refers to update domains, not fault domains. We need two update domains, answer is D.
upvoted 6 times
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Renz123
5 months, 1 week ago
its mlantonis
upvoted 4 times
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Parsec
Highly Voted 3 years, 3 months ago
It's "planned maintenance of the HARDWARE" in the question, not OS or software update. Should be 2 fault domains imho.
upvoted 34 times
janshal
3 years, 3 months ago
Hi the answer is D: the Q talk about the hardware hosting VM1 and VM2. the hardware, meaning the Server containing the VMs (Called Update domain ). During a Planed maintenance the update domains are shootdown one at a time. so D is ther right answer
upvoted 37 times
HuseinHasan
3 years, 3 months ago
what will happen if the fault domain crashes, thats why i would go with two fault domains
upvoted 1 times
Alir95
2 years, 11 months ago
The question is specific to "Planned Maint", not outages and redundancy ... D is right.
upvoted 7 times
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sandipk91
2 years, 7 months ago
your assumption is wrong as they are talkin about planned maintenance
upvoted 2 times
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wgalan
9 months ago
Is a trick answer using the "hardware" to steer you towards the fault domain answer, but the keyword is "planned maintenance" that's why D is the correct answer
upvoted 2 times
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moadabdou
Most Recent 15 hours, 59 minutes ago
The correct answer is: B. Two fault domains. Explanation: An availability set in Azure is a way to ensure high availability of applications by distributing them across multiple distinct physical servers called fault domains. Each fault domain shares a common underlying infrastructure, such as power and cooling, but is isolated from other fault domains. Thus, if an issue occurs in one of the fault domains, the other domains remain operational, ensuring the continuous availability of applications. In this case, by having two fault domains, the availability set will ensure that App1 remains available during planned maintenance of the hardware hosting VM1 and VM2.
upvoted 1 times
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tashakori
2 weeks ago
D is right
upvoted 1 times
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1828b9d
3 weeks, 6 days ago
This question was in exam 01/03/2024
upvoted 1 times
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WeepingMaplte
3 months, 3 weeks ago
Fault Domains = Physical Rack sharing power and network. Unplanned maintenance. Max 3 Update Domains = Logical grouping of virtual machine. Allows restarts/planned maintenance. Max 20. Ref: https://youtu.be/BGcKAXMBmcs?si=1-aPQzYi1wQ-DRbG
upvoted 1 times
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Mehedi007
8 months ago
Selected Answer: D
keywords: planned maintenance. "The order of update domains being rebooted may not proceed sequentially during planned maintenance, but only one update domain is rebooted at a time." https://learn.microsoft.com/en-us/azure/virtual-machines/availability-set-overview#how-do-availability-sets-work
upvoted 1 times
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Pakawat
8 months, 4 weeks ago
Found this Q in the exam, 3/7/2023
upvoted 5 times
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xRiot007
10 months ago
I think MS needs to merge these 2 because they create confusion. If a system is down, then it's down and can't serve your customers. The reason is irrelevant, be it maintenance or an unexpected failure of whatever nature. In concept, update and failure domains should coincide.
upvoted 2 times
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margotfrpp
11 months, 2 weeks ago
Selected Answer: B
Fault domains represent separate racks in the data center and protect against single points of failure. Update domains protect against planned maintenance and software updates. It is best practice to place VMs across multiple fault domains and update domains for the highest level of availability. Therefore, in this scenario, including two fault domains in the Availability Set will ensure that the application remains available during planned maintenance of the hardware hosting VM1 and VM2.
upvoted 4 times
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vbohr899
1 year, 1 month ago
Cleared Exam today 26 Feb, This question was there in exam.
upvoted 6 times
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zellck
1 year, 1 month ago
Selected Answer: D
D is the answer. https://learn.microsoft.com/en-us/azure/virtual-machines/availability-set-overview#how-do-availability-sets-work Update domains indicate groups of virtual machines and underlying physical hardware that can be rebooted at the same time. When more than five virtual machines are configured within a single availability set with five update domains, the sixth virtual machine is placed into the same update domain as the first virtual machine, the seventh in the same update domain as the second virtual machine, and so on. The order of update domains being rebooted may not proceed sequentially during planned maintenance, but only one update domain is rebooted at a time. A rebooted update domain is given 30 minutes to recover before maintenance is initiated on a different update domain.
upvoted 2 times
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Ashfaque_9x
1 year, 2 months ago
Selected Answer: D
Passed today on 29Jan23 with a score of 970. This question was in the exam. Correct Answer: D. two update domains
upvoted 7 times
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NaoVaz
1 year, 6 months ago
Selected Answer: D
D) "two update domains" To assure that during planned maintenance at least 1 VM is still operational, 2 Update Domains need to be created. Each VM will be in its respective Update Domain.
upvoted 4 times
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EmnCours
1 year, 7 months ago
Correct Answer: D
upvoted 2 times
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viveksen1
1 year, 7 months ago
Two update domains is correct - It's talking about planned maintenance
upvoted 1 times
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chaosatul
1 year, 8 months ago
got this in today's exam 09-07-2022
upvoted 6 times
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A (35%)
C (25%)
B (20%)
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