- A
Availability set
Why wrong: An availability set provides fault tolerance within a single Azure datacenter by distributing VMs across multiple fault domains and update domains. It does not span separate data centers within a region.
- B
Availability zone
Availability zones are physically separate data centers within an Azure region. Deploying VMs across zones protects against an entire data center failure. This matches the requirement of using distinct data centers.
- C
Proximity placement group
Why wrong: A proximity placement group is used to reduce network latency by co-locating resources. It does not spread VMs across different data centers for fault tolerance.
- D
Azure Load Balancer
Why wrong: Azure Load Balancer distributes incoming traffic but does not inherently ensure that VMs are placed in different physical locations. It can work with availability sets or zones, but it is not the construct for physical placement.
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 deploys a multi-tier application using Azure virtual machines. The web tier VMs must be evenly distributed across two distinct data centers within an Azure region to avoid a single point of failure from an infrastructure outage. Which Azure construct should they use to meet this requirement?
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 are physically separate data centers within an Azure region, each with independent power, cooling, and networking. By deploying the web tier VMs across two distinct zones, the application avoids a single point of failure from an infrastructure outage at the data center level, meeting the requirement for high availability across distinct data centers.
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 provides fault tolerance within a single Azure datacenter by distributing VMs across multiple fault domains and update domains. It does not span separate data centers within a region.
- ✓
Availability zone
Why this is correct
Availability zones are physically separate data centers within an Azure region. Deploying VMs across zones protects against an entire data center failure. This matches the requirement of using distinct data centers.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Proximity placement group
Why it's wrong here
A proximity placement group is used to reduce network latency by co-locating resources. It does not spread VMs across different data centers for fault tolerance.
- ✗
Azure Load Balancer
Why it's wrong here
Azure Load Balancer distributes incoming traffic but does not inherently ensure that VMs are placed in different physical locations. It can work with availability sets or zones, but it is not the construct for physical placement.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse availability sets (which protect against rack-level failures within a single data center) with availability zones (which protect against full data center outages), and they overlook the key phrase 'distinct data centers within an Azure region' that explicitly points to zones.
Detailed technical explanation
How to think about this question
Azure availability zones offer a 99.99% VM uptime SLA when VMs are deployed across two or more zones, compared to 99.95% for availability sets. Each zone is a unique physical location with its own power source, cooling, and network, and zone-level failures are isolated to prevent cascading outages. In a real-world scenario, if a regional disaster affects one zone, the application continues running in the other zone 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
A media company stores terabytes of video archives that are accessed once a year for audit purposes. Moving these objects to a cold storage tier (Azure Archive, S3 Glacier, or Google Nearline) costs a fraction of hot storage. Questions like this test whether you understand storage tiers, access frequency tradeoffs, and retrieval latency requirements.
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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Describe Azure architecture and services — study guide chapter
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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 are physically separate data centers within an Azure region, each with independent power, cooling, and networking. By deploying the web tier VMs across two distinct zones, the application avoids a single point of failure from an infrastructure outage at the data center level, meeting the requirement for high availability across distinct data centers.
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
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Last reviewed: Jun 11, 2026
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