- A
Availability zones
Why wrong: Zones provide stronger datacenter-level protection than needed, but they are not the best match for this simpler maintenance requirement.
- B
Availability set
An availability set spreads VMs across update domains and fault domains within a datacenter boundary. That helps reduce downtime during planned maintenance and some hardware issues. Since the requirement does not include protection from an entire datacenter outage, an availability set is the right and simpler choice.
- C
Virtual machine scale set
Why wrong: A scale set helps with horizontal scaling, but it is not specifically the simplest choice for planned host maintenance protection.
- D
Proximity placement group
Why wrong: A proximity placement group is for lowering latency between resources, not for availability during maintenance.
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.
A company has two application VMs in the same Azure region. The main requirement is to reduce downtime during planned host maintenance. The business does not require protection from a complete datacenter outage. Which option should you choose?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Availability set
An availability set distributes VMs across multiple fault domains and update domains within a single Azure datacenter. During planned host maintenance, Azure updates one update domain at a time, ensuring that only a subset of VMs are rebooted simultaneously, thereby reducing downtime. This meets the requirement of protecting against planned maintenance without needing cross-datacenter redundancy.
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.
- ✗
Availability zones
Why it's wrong here
Zones provide stronger datacenter-level protection than needed, but they are not the best match for this simpler maintenance requirement.
- ✓
Availability set
Why this is correct
An availability set spreads VMs across update domains and fault domains within a datacenter boundary. That helps reduce downtime during planned maintenance and some hardware issues. Since the requirement does not include protection from an entire datacenter outage, an availability set is the right and simpler choice.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Virtual machine scale set
Why it's wrong here
A scale set helps with horizontal scaling, but it is not specifically the simplest choice for planned host maintenance protection.
- ✗
Proximity placement group
Why it's wrong here
A proximity placement group is for lowering latency between resources, not for availability during maintenance.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse availability zones (which protect against datacenter-level failures) with availability sets (which protect against rack-level failures and planned maintenance), leading them to over-engineer the solution with zones when the requirement explicitly excludes datacenter outage protection.
Detailed technical explanation
How to think about this question
An availability set logically groups VMs into up to 3 fault domains (shared power and network) and up to 20 update domains. During planned maintenance, Azure serially reboots VMs in each update domain, ensuring at most one domain is offline at a time. This mechanism relies on the Azure Fabric Controller to orchestrate updates, and VMs in the same availability set receive a 99.95% SLA, which is sufficient for intra-datacenter resilience without cross-zone replication.
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.
What to study next
Got this wrong? Here's your next step.
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FAQ
Questions learners often ask
What does this AZ-104 question test?
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: Availability set — An availability set distributes VMs across multiple fault domains and update domains within a single Azure datacenter. During planned host maintenance, Azure updates one update domain at a time, ensuring that only a subset of VMs are rebooted simultaneously, thereby reducing downtime. This meets the requirement of protecting against planned maintenance without needing cross-datacenter redundancy.
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.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
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Last reviewed: Jun 11, 2026
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