The answer is an availability set. This feature is the correct choice because it logically groups identical VMs and distributes them across fault domains and update domains, ensuring that during a host failure or planned maintenance, not all VMs are affected simultaneously. Fault domains represent separate racks with independent power, cooling, and network, while update domains are groups of VMs that are rebooted sequentially during Azure’s maintenance cycles. On the AZ-104 exam, this question tests your understanding of high availability for IaaS workloads, often appearing as a scenario where you must choose between availability sets, availability zones, or scale sets. A common trap is confusing availability sets (which protect against rack-level failures and planned updates) with availability zones (which protect against entire datacenter failures). Memory tip: think of an “AS” for “Always Separate” — fault domains separate by hardware, update domains separate by reboot timing.
AZ-104 Deploy and Manage Azure Compute Practice Question
This AZ-104 practice question tests your understanding of deploy and manage azure compute. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
You need to deploy a group of identical Azure virtual machines and ensure they are distributed across fault domains and update domains to reduce the impact of host failures and planned maintenance. Which feature should you use?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
An availability set
An availability set is the correct feature because it logically groups VMs to isolate them from each other during host failures and planned maintenance. It distributes VMs across up to 3 fault domains (each with separate power, cooling, and network) and up to 20 update domains (which are rebooted sequentially during maintenance), ensuring that not all VMs are impacted simultaneously.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✓
An availability set
Why this is correct
Availability sets distribute VMs across fault and update domains.
Related concept
Read the scenario before looking for a memorised answer.
✗
A proximity placement group
Why it's wrong here
A proximity placement group optimizes latency by placing resources close together, not by improving fault-domain separation.
✗
A private endpoint
Why it's wrong here
A private endpoint is for private connectivity to services.
✗
A custom script extension
Why it's wrong here
A custom script extension runs scripts and does not provide host-level resiliency.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse availability sets with availability zones, thinking zones are required for fault domain distribution, but availability sets provide fault and update domain isolation within a single Azure region without requiring multiple zones.
Detailed technical explanation
How to think about this question
Under the hood, an availability set assigns each VM to a specific fault domain (FD) and update domain (UD) based on a placement algorithm that ensures VMs are spread across physical racks. Fault domains correspond to distinct hardware racks with independent power and network switches, while update domains define the reboot sequence during Azure platform maintenance—only one UD is rebooted at a time, with a 30-minute pause between each. In a real-world scenario, if you deploy 3 VMs in an availability set with 2 FDs, Azure guarantees that at least 2 VMs are in different FDs, so a single rack failure affects at most 2 VMs.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
TExam Day Tips
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
An e-commerce site experiences heavy traffic on Black Friday and near-zero traffic during off-peak weeks. Rather than provisioning permanent large VMs, the team uses auto-scaling groups that add capacity automatically under load and reduce it overnight. Questions like this test whether you understand elasticity, availability zones, and cloud compute scaling patterns.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this AZ-104 question in full detail.
Deploy and Manage Azure Compute — This question tests Deploy and Manage Azure Compute — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: An availability set — An availability set is the correct feature because it logically groups VMs to isolate them from each other during host failures and planned maintenance. It distributes VMs across up to 3 fault domains (each with separate power, cooling, and network) and up to 20 update domains (which are rebooted sequentially during maintenance), ensuring that not all VMs are impacted simultaneously.
What should I do if I get this AZ-104 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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