The answer is availability zones. This is the correct choice because availability zones are physically separate locations within a single Azure region, each equipped with independent power, cooling, and networking infrastructure. By deploying Azure Virtual Machines across multiple zones, you achieve intra-region resilience, ensuring that a failure in one datacenter—such as a power outage or network cut—does not take down the entire application. On the AZ-900 exam, this concept tests your understanding of how Azure protects against localized failures within a region, and a common trap is confusing availability zones with region pairs, which handle cross-region disaster recovery rather than intra-region protection. A helpful memory tip: think of zones as “firewalls within a city”—each zone is a separate building with its own utilities, so if one building loses power, the others keep running.
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.
An application deployed on Azure Virtual Machines needs to be resilient to failures within a single Azure region. The VMs are placed across multiple physically separate locations within the region, each with independent power, cooling, and networking. What is this feature called?
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 locations within an Azure region, each with independent power, cooling, and networking. By placing VMs across different zones, you protect your application from a single point of failure within the region, such as a datacenter outage. This is the correct feature for achieving intra-region resilience.
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 groups VMs across different fault domains within a single datacenter, not across separate physical locations.
✓
Availability zone
Why this is correct
An availability zone is a unique physical location within a region, with independent power, cooling, and networking.
Related concept
Read the scenario before looking for a memorised answer.
✗
Region pair
Why it's wrong here
Region pairs are two regions within the same geography, used for cross-region replication, not within a single region.
✗
Resource group
Why it's wrong here
A resource group is a logical container for resources, not a physical infrastructure feature.
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 a single datacenter) with availability zones (which protect against entire datacenter failures within a region), leading them to select availability set when the question explicitly mentions 'physically separate locations with independent power, cooling, and networking.'
Detailed technical explanation
How to think about this question
Each availability zone is a unique physical location within an Azure region, typically consisting of one or more datacenters with dedicated power, cooling, and network infrastructure. Azure guarantees at least 99.99% VM uptime when you deploy two or more VMs across two or more availability zones. Under the hood, Azure uses zone-redundant services and zone-pinned resources to ensure that a failure in one zone does not affect others, and network latency between zones is typically less than 2 milliseconds.
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.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this AZ-900 question in full detail.
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 locations within an Azure region, each with independent power, cooling, and networking. By placing VMs across different zones, you protect your application from a single point of failure within the region, such as a datacenter outage. This is the correct feature for achieving intra-region resilience.
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.
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Question Discussion
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