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. 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 deploys a critical application on Azure virtual machines. They want to ensure that the VMs are distributed across physically separate datacenters within a single Azure region to protect against a single datacenter failure. Which Azure feature should they use?
Availability zones
Availability zones are distinct datacenters within a region, providing physical separation.
Availability sets
Why wrong: Availability sets protect against failures within a single datacenter, not across datacenters.
Resource groups
Why wrong: Resource groups are logical containers, not a high-availability feature.
Azure Site Recovery
Why wrong: Site Recovery is for disaster recovery across regions, not within a region.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Availability zones
Availability zones are physically separate datacenters within an Azure region, each with independent power, cooling, and networking. By deploying VMs across multiple zones, the application is protected from a single datacenter failure, as Azure ensures at least one zone remains operational during an outage.
Key principle: Availability Zones are physically separate datacenters within an Azure region.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
Availability zones
Why this is correct
Availability zones are distinct datacenters within a region, providing physical separation.
Related concept
Availability Zones are physically separate datacenters within an Azure region.
Availability sets
Why it's wrong here
Availability sets protect against failures within a single datacenter, not across datacenters.
Resource groups
Why it's wrong here
Resource groups are logical containers, not a high-availability feature.
Azure Site Recovery
Why it's wrong here
Site Recovery is for disaster recovery across regions, not within a region.
Common exam traps
The trap here is that candidates confuse availability sets (which protect against rack-level failures within one datacenter) with availability zones (which protect against full datacenter failures), leading them to select availability sets when the question explicitly requires separation across physically separate datacenters.
Detailed technical explanation
Each availability zone is a unique physical location with an independent power source, cooling system, and network infrastructure, and Azure guarantees at least 99.99% VM uptime when two or more instances are deployed across zones. Zone-redundant deployments use low-latency links to synchronize data, but cross-zone network traffic incurs standard egress charges. In a real-world scenario, a financial trading application might use zone-redundant VMs to maintain low-latency access within the same region while surviving a datacenter-level power outage.
Key takeaway
Availability Zones are physically separate datacenters within an Azure region.
Real-world example
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
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
Describe Azure architecture and services — This question tests Describe Azure architecture and services — Availability Zones are physically separate datacenters within an Azure region..
The correct answer is: Availability zones — Availability zones are physically separate datacenters within an Azure region, each with independent power, cooling, and networking. By deploying VMs across multiple zones, the application is protected from a single datacenter failure, as Azure ensures at least one zone remains operational during an outage.
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.
Availability Zones are physically separate datacenters within an Azure region.
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Last reviewed: Jun 11, 2026
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