Question 709 of 1,031

Describe Azure architecture and services →mediumMultiple ChoiceObjective-mapped

Quick Answer

The answer is Azure Availability Set. This is the correct choice because an Availability Set logically groups VMs within the same datacenter while placing them on separate physical hardware through fault domains, which protects against a rack-level failure, and also distributes them across update domains to ensure only one VM is rebooted at a time during Azure platform maintenance. On the Microsoft Azure Fundamentals AZ-900 exam, this question tests your understanding of high availability within a single datacenter, often contrasting Availability Sets with Availability Zones, which span multiple datacenters. A common trap is confusing the two: remember that Availability Sets protect against rack failure inside one datacenter, while Availability Zones protect against an entire datacenter failure. For a memory tip, think of “Set” as “Same datacenter, separate racks” — the word “Set” implies a fixed grouping within one location.

AZ-900 Describe Azure architecture and services Practice Question

This AZ-900 practice question tests your understanding of describe azure architecture and services. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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 two Azure virtual machines that host a critical line-of-business application. The application is stateful and requires that the VMs are located in the same datacenter but on separate physical hardware to protect against a rack-level failure. Additionally, the VMs must be updated during Azure platform maintenance in a staggered manner to ensure the application remains available. Which Azure feature should the company configure for these VMs?

Question 1mediummultiple choice

Full question →

A
Azure Availability Zones
Why wrong: Availability Zones place VMs in separate datacenters within a region, which provides protection against a datacenter failure but introduces network latency between zones. The scenario requires VMs to be in the same datacenter, so this is incorrect.
B
Azure Virtual Machine Scale Set with autoscale
Why wrong: A Virtual Machine Scale Set is designed to automatically scale the number of VMs based on demand. It does not guarantee that VMs are placed on separate physical hardware within a single datacenter or provide update domain isolation in the same way as an Availability Set.
C
Azure Application Gateway
Why wrong: Application Gateway is a web traffic load balancer that operates at Layer 7. It distributes incoming requests to backend VMs but does not influence the physical placement or update domain scheduling of the VMs themselves.
D
Azure Availability Set
An Availability Set logically groups VMs to ensure they are distributed across multiple fault domains (different physical racks with independent power and networking) and multiple update domains (VMs in different update domains are not rebooted at the same time during Azure maintenance). This meets the stated requirements for same-datacenter placement with fault tolerance and staggered updates.

Full breakdown with real-world context →

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

✓

Azure Availability Set

Azure Availability Set ensures that VMs are placed in the same datacenter (same fault domain) but on separate physical hardware (different fault domains) to protect against rack-level failures. It also distributes VMs across update domains so that during Azure platform maintenance, only one update domain is rebooted at a time, ensuring the application remains available in a staggered manner.

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 Availability Zones
Why it's wrong here
Availability Zones place VMs in separate datacenters within a region, which provides protection against a datacenter failure but introduces network latency between zones. The scenario requires VMs to be in the same datacenter, so this is incorrect.
✗
Azure Virtual Machine Scale Set with autoscale
Why it's wrong here
A Virtual Machine Scale Set is designed to automatically scale the number of VMs based on demand. It does not guarantee that VMs are placed on separate physical hardware within a single datacenter or provide update domain isolation in the same way as an Availability Set.
✗
Azure Application Gateway
Why it's wrong here
Application Gateway is a web traffic load balancer that operates at Layer 7. It distributes incoming requests to backend VMs but does not influence the physical placement or update domain scheduling of the VMs themselves.
✓
Azure Availability Set
Why this is correct
An Availability Set logically groups VMs to ensure they are distributed across multiple fault domains (different physical racks with independent power and networking) and multiple update domains (VMs in different update domains are not rebooted at the same time during Azure maintenance). This meets the stated requirements for same-datacenter placement with fault tolerance and staggered updates.
Related concept
Read the scenario before looking for a memorised answer.

Common exam traps

Common exam trap: answer the scenario, not the keyword

The trap here is confusing Availability Zones (which isolate across datacenters) with Availability Sets (which isolate within a single datacenter), leading candidates to choose Availability Zones despite the explicit requirement that VMs be in the same datacenter.

Trap categories for this question

Scenario analysis trap
Availability Zones place VMs in separate datacenters within a region, which provides protection against a datacenter failure but introduces network latency between zones. The scenario requires VMs to be in the same datacenter, so this is incorrect.

Detailed technical explanation

How to think about this question

An Availability Set groups VMs into fault domains (up to 3) and update domains (up to 20). Fault domains represent a rack of servers sharing a common power source and network switch; placing VMs in different fault domains ensures they are on separate physical hardware. Update domains are logical groups that undergo maintenance sequentially, with a 30-minute pause between domains, guaranteeing that at most one update domain is rebooted at a time. This design is critical for stateful applications that cannot tolerate simultaneous reboots.

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.

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.

10 questions 20 questions 30 questions 50 questions Timed 30

AZ-900 practice-test guide →Study guide →Browse all practice tests

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: Azure Availability Set — Azure Availability Set ensures that VMs are placed in the same datacenter (same fault domain) but on separate physical hardware (different fault domains) to protect against rack-level failures. It also distributes VMs across update domains so that during Azure platform maintenance, only one update domain is rebooted at a time, ensuring the application remains available in a staggered manner.

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.

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 →

How Courseiva writes practice questions · Editorial policy

Keep practising

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.

Loading comments…

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.