- A
Availability Set
Why wrong: An Availability Set protects against rack-level failures within a single datacenter by distributing VMs across different fault domains and update domains. It does not protect against an entire datacenter outage.
- B
Availability Zone
Availability Zones are physically separate datacenters within an Azure region, each with its own independent power, cooling, and networking. Deploying VMs across multiple zones protects against a complete datacenter failure while keeping resources in the same region.
- C
Resource Group
Why wrong: A Resource Group is a logical container for resources that share the same lifecycle, permissions, and policies. It does not provide any infrastructure-level availability or protection against datacenter outages.
- D
Proximity Placement Group
Why wrong: A Proximity Placement Group is used to colocate VMs in the same datacenter to minimize network latency. This reduces availability by placing VMs on the same infrastructure, making them vulnerable to a single datacenter failure.
AZ-900 Describe Azure architecture and services Practice Question
This AZ-900 practice question tests your understanding of describe azure architecture and services. 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 runs a mission-critical application on Azure virtual machines. The application must remain available even if an entire Azure datacenter in a region experiences a complete outage (e.g., power failure). The company wants all VMs to be located in the same Azure region to minimize latency. Which Azure feature should the company use to deploy the VMs?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue:
"minimum / minimize"Why it matters: Asks for the least resource use — fewest addresses, smallest subnet, lowest overhead. Eliminate over-provisioned options even if they would technically work.
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 Zone
Availability Zones (AZs) are physically separate datacenters within an Azure region, each with independent power, cooling, and networking. Deploying VMs across multiple AZs protects against a single datacenter failure while keeping all resources within the same region to minimize latency. This meets the requirement for high availability during a complete datacenter outage.
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 Set
Why it's wrong here
An Availability Set protects against rack-level failures within a single datacenter by distributing VMs across different fault domains and update domains. It does not protect against an entire datacenter outage.
- ✓
Availability Zone
Why this is correct
Availability Zones are physically separate datacenters within an Azure region, each with its own independent power, cooling, and networking. Deploying VMs across multiple zones protects against a complete datacenter failure while keeping resources in the same region.
Clue confirmation
The clue word "minimum / minimize" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Resource Group
Why it's wrong here
A Resource Group is a logical container for resources that share the same lifecycle, permissions, and policies. It does not provide any infrastructure-level availability or protection against datacenter outages.
- ✗
Proximity Placement Group
Why it's wrong here
A Proximity Placement Group is used to colocate VMs in the same datacenter to minimize network latency. This reduces availability by placing VMs on the same infrastructure, making them vulnerable to a single datacenter failure.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is confusing Availability Sets (which protect against rack-level failures within a datacenter) with Availability Zones (which protect against full datacenter outages), leading candidates to choose the wrong high-availability option for region-wide disasters.
Detailed technical explanation
How to think about this question
Each Availability Zone is a unique physical location with an independent power source, network, and cooling, and is connected to other zones in the region via a high-speed, low-latency private fiber-optic network. Azure guarantees at least 99.99% VM uptime when two or more VMs are deployed across two or more zones. Under the hood, zone-redundant services use a distributed control plane to automatically failover traffic, ensuring application continuity without manual intervention.
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.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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FAQ
Questions learners often ask
What does this AZ-900 question test?
Describe Azure architecture and services — This question tests Describe Azure architecture and services — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Availability Zone — Availability Zones (AZs) are physically separate datacenters within an Azure region, each with independent power, cooling, and networking. Deploying VMs across multiple AZs protects against a single datacenter failure while keeping all resources within the same region to minimize latency. This meets the requirement for high availability during a complete datacenter outage.
What should I do if I get this AZ-900 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Are there clue words in this question I should notice?
Yes — watch for: "minimum / minimize". Asks for the least resource use — fewest addresses, smallest subnet, lowest overhead. Eliminate over-provisioned options even if they would technically work.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
About these practice questions
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Last reviewed: Jun 11, 2026
This AZ-900 practice question is part of Courseiva's free Microsoft certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the AZ-900 exam.
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