- A
Deploy the VMs in an availability set.
Why wrong: An availability set distributes VMs across different fault domains and update domains within a single datacenter. While it protects against hardware failures and planned maintenance within that datacenter, it does not protect against the failure of the entire datacenter itself.
- B
Deploy the VMs in different Azure regions connected with Azure Traffic Manager.
Why wrong: This approach provides disaster recovery across regions, not within a single region. The requirement specifies using the East US region only, so a cross-region solution is not applicable.
- C
Deploy the VMs in different availability zones within East US.
Availability zones are physically separate datacenters within the same region, each with independent power, cooling, and networking. Deploying VMs across multiple zones ensures the application remains available if one entire datacenter fails.
- D
Deploy all VMs in the same availability set but in different fault domains.
Why wrong: Different fault domains within an availability set still reside in the same datacenter. Although this protects against rack-level failures, it does not provide protection against a full datacenter outage.
AZ-900 Describe Azure architecture and services Practice Question
This AZ-900 practice question tests your understanding of describe azure architecture and services. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. A key principle to apply: availability Zones are physically separate datacenters within an Azure region.. 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 plans to deploy a mission-critical application on Azure virtual machines. The application must remain available if a single Azure datacenter fails. The company chooses to deploy the VMs in the East US Azure region. The solution should provide the highest availability within that single region. What should the company configure?
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
Deploy the VMs in different availability zones within East US.
Option C is correct because deploying VMs across availability zones within a single region provides the highest availability within that region. Availability zones are physically separate datacenters within an Azure region, each with independent power, cooling, and networking. This configuration protects against a single datacenter failure while keeping all resources in the same region, meeting the requirement for high availability without cross-region complexity.
Key principle: Availability Zones are physically separate datacenters within an Azure region.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Deploy the VMs in an availability set.
Why it's wrong here
An availability set distributes VMs across different fault domains and update domains within a single datacenter. While it protects against hardware failures and planned maintenance within that datacenter, it does not protect against the failure of the entire datacenter itself.
- ✗
Deploy the VMs in different Azure regions connected with Azure Traffic Manager.
Why it's wrong here
This approach provides disaster recovery across regions, not within a single region. The requirement specifies using the East US region only, so a cross-region solution is not applicable.
- ✓
Deploy the VMs in different availability zones within East US.
Why this is correct
Availability zones are physically separate datacenters within the same region, each with independent power, cooling, and networking. Deploying VMs across multiple zones ensures the application remains available if one entire datacenter fails.
Related concept
Availability Zones are physically separate datacenters within an Azure region.
- ✗
Deploy all VMs in the same availability set but in different fault domains.
Why it's wrong here
Different fault domains within an availability set still reside in the same datacenter. Although this protects against rack-level failures, it does not provide protection against a full datacenter outage.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse availability sets (which protect against rack-level failures within one datacenter) with availability zones (which protect against entire datacenter failures), leading them to choose Option A instead of C.
Detailed technical explanation
How to think about this question
Availability zones in Azure are unique physical locations within an Azure region, each with its own independent power source, network, and cooling. They are connected through high-speed private fiber-optic networks, enabling synchronous replication and low-latency failover. For mission-critical applications, deploying VMs across at least two zones with a load balancer (e.g., Azure Standard Load Balancer) ensures that if one zone fails, traffic is automatically routed to the remaining healthy zones, achieving a 99.99% SLA for VMs when using premium managed disks.
KKey Concepts to Remember
- Availability Zones are physically separate datacenters within an Azure region.
- Each Availability Zone has independent power, cooling, and networking.
- Deploying VMs across multiple zones protects against an entire datacenter failure.
- Availability Zones provide the highest availability within a single Azure region.
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
Availability Zones are physically separate datacenters within an Azure region.
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.
Review availability Zones are physically separate datacenters within an Azure region., then practise related AZ-900 questions on the same topic to reinforce the concept.
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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 — Availability Zones are physically separate datacenters within an Azure region..
What is the correct answer to this question?
The correct answer is: Deploy the VMs in different availability zones within East US. — Option C is correct because deploying VMs across availability zones within a single region provides the highest availability within that region. Availability zones are physically separate datacenters within an Azure region, each with independent power, cooling, and networking. This configuration protects against a single datacenter failure while keeping all resources in the same region, meeting the requirement for high availability without cross-region complexity.
What should I do if I get this AZ-900 question wrong?
Review availability Zones are physically separate datacenters within an Azure region., then practise related AZ-900 questions on the same topic to reinforce the concept.
What is the key concept behind this question?
Availability Zones are physically separate datacenters within an Azure region.
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Last reviewed: Jun 11, 2026
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