- A
Azure Load Balancer
Why wrong: A load balancer distributes incoming traffic across VMs but does not control the physical placement of the VMs on separate hardware or racks.
- B
Availability set
An availability set places VMs in different fault domains and update domains, ensuring they are on separate physical servers and racks within a single Azure datacenter, protecting against hardware failures.
- C
Availability zone
Why wrong: Availability zones are separate physical datacenters within an Azure region. They protect against entire datacenter failures, but not specifically against single-rack or server-level failures within a datacenter.
- D
Virtual network
Why wrong: A virtual network provides network isolation and connectivity but does not enforce any physical placement or fault tolerance for the VMs.
Quick Answer
The answer is an availability set, which guarantees that your two virtual machines are placed on separate physical hardware and separate racks within an Azure datacenter. This is achieved through the use of fault domains, which are logical groupings of underlying hardware that share a common power source and network switch. By assigning your VMs to different fault domains within the same availability set, Azure ensures they run on distinct physical servers and racks, thereby minimizing the impact of a single hardware failure like a server outage or a rack-level power loss. On the AZ-900 exam, this concept tests your understanding of high availability at the infrastructure level, often appearing as a scenario where you must choose between an availability set, an availability zone, or a scale set. A common trap is confusing fault domains with update domains—remember that fault domains handle physical separation for hardware failures, while update domains handle planned maintenance. Memory tip: think of "fault" as "faulty hardware" and "domain" as "a separate physical zone," so an availability set spreads your VMs across multiple fault domains to keep them apart.
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 is deploying a critical internal application in Azure. The application will run on two virtual machines. The solution must guarantee that the virtual machines are placed on separate physical servers and separate racks to minimize the impact of hardware failures. Which Azure feature should the company use?
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 set
An availability set ensures that virtual machines are distributed across multiple fault domains (separate physical servers and racks) and update domains within an Azure datacenter. By placing the two VMs in the same availability set, Azure guarantees they will be on different physical hardware, minimizing the impact of a single hardware failure.
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.
- ✗
Azure Load Balancer
Why it's wrong here
A load balancer distributes incoming traffic across VMs but does not control the physical placement of the VMs on separate hardware or racks.
- ✓
Availability set
Why this is correct
An availability set places VMs in different fault domains and update domains, ensuring they are on separate physical servers and racks within a single Azure datacenter, protecting against hardware failures.
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.
- ✗
Availability zone
Why it's wrong here
Availability zones are separate physical datacenters within an Azure region. They protect against entire datacenter failures, but not specifically against single-rack or server-level failures within a datacenter.
- ✗
Virtual network
Why it's wrong here
A virtual network provides network isolation and connectivity but does not enforce any physical placement or fault tolerance for the VMs.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is confusing Availability Zones (which provide datacenter-level isolation) with Availability Sets (which provide rack-level isolation within a single datacenter), leading candidates to over-engineer the solution when a simpler, lower-latency option is correct.
Detailed technical explanation
How to think about this question
An availability set defines up to three fault domains (by default) and up to 20 update domains. Each fault domain corresponds to a separate rack with its own power and network switch, ensuring that a rack-level failure only affects one VM. Azure automatically assigns VMs in the same availability set to different fault domains, and during planned maintenance, only one update domain is rebooted at a time, preserving application uptime.
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.
- →
Describe Azure architecture and services — study guide chapter
Learn the concepts, then practise the questions
- →
Describe Azure architecture and services practice questions
Targeted practice on this topic area only
- →
All AZ-900 questions
1,031 questions across all exam domains
- →
Microsoft Azure Fundamentals AZ-900 study guide
Full concept coverage aligned to exam objectives
- →
AZ-900 practice test guide
How to use practice tests most effectively before exam day
Related practice questions
Related AZ-900 practice-question pages
Use these pages to review the topic behind this question. This is how one missed question becomes focused revision.
Describe cloud concepts practice questions
Practise AZ-900 questions linked to Describe cloud concepts.
Describe Azure architecture and services practice questions
Practise AZ-900 questions linked to Describe Azure architecture and services.
Describe Azure management and governance practice questions
Practise AZ-900 questions linked to Describe Azure management and governance.
AZ-900 Azure services practice questions
Practise AZ-900 questions linked to AZ-900 Azure services.
AZ-900 pricing and support practice questions
Practise AZ-900 questions linked to AZ-900 pricing and support.
AZ-900 security and compliance practice questions
Practise AZ-900 questions linked to AZ-900 security and compliance.
AZ-900 governance practice questions
Practise AZ-900 questions linked to AZ-900 governance.
Practice this exam
Start a free AZ-900 practice session
Short sessions build daily habit. Longer sessions build exam-day stamina. Try a timed session to simulate real conditions.
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 set — An availability set ensures that virtual machines are distributed across multiple fault domains (separate physical servers and racks) and update domains within an Azure datacenter. By placing the two VMs in the same availability set, Azure guarantees they will be on different physical hardware, minimizing the impact of a single hardware failure.
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
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 →
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.
Question Discussion
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
Sign in to join the discussion.