- A
Availability Sets
Why wrong: Availability Sets distribute virtual machines across multiple fault domains and update domains within a single datacenter. This protects against hardware failures (e.g., rack failures) and planned maintenance events, but does not provide resilience against a complete datacenter failure because all VMs remain in the same physical location.
- B
Availability Zones
Availability Zones are unique physical locations within an Azure region, each with its own independent power, cooling, and networking. Deploying resources across multiple zones ensures that if one datacenter experiences a failure, the application continues to run in the other zones with low-latency connectivity.
- C
Azure Site Recovery
Why wrong: Azure Site Recovery is a disaster recovery service that orchestrates replication and failover of workloads to a secondary Azure region or on-premises location. It is designed for cross-region recovery, not for high availability within a single region, and using it for intra-region failover would not meet the requirement for low-latency replication across separate datacenters in the same region.
- D
Region Pairs
Why wrong: Region Pairs consist of two Azure regions within the same geography, typically at least 300 miles apart. They are used for cross-region replication and disaster recovery, but they do not provide the intra-region redundancy and low-latency connectivity required to protect against a datacenter failure within a single region.
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 finance company is migrating a mission-critical trading application to Azure. The application must be resilient to a complete datacenter failure within the same Azure region. The solution should provide low-latency replication between separate physical locations with independent power, cooling, and networking. Which Azure feature should they use?
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 Zones
Availability Zones (B) are physically separate datacenters within an Azure region, each with independent power, cooling, and networking. They provide low-latency replication and protect against a complete datacenter failure by allowing the application to run in multiple zones simultaneously, ensuring high availability and resilience within a single region.
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 Sets
Why it's wrong here
Availability Sets distribute virtual machines across multiple fault domains and update domains within a single datacenter. This protects against hardware failures (e.g., rack failures) and planned maintenance events, but does not provide resilience against a complete datacenter failure because all VMs remain in the same physical location.
- ✓
Availability Zones
Why this is correct
Availability Zones are unique physical locations within an Azure region, each with its own independent power, cooling, and networking. Deploying resources across multiple zones ensures that if one datacenter experiences a failure, the application continues to run in the other zones with low-latency connectivity.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Azure Site Recovery
Why it's wrong here
Azure Site Recovery is a disaster recovery service that orchestrates replication and failover of workloads to a secondary Azure region or on-premises location. It is designed for cross-region recovery, not for high availability within a single region, and using it for intra-region failover would not meet the requirement for low-latency replication across separate datacenters in the same region.
- ✗
Region Pairs
Why it's wrong here
Region Pairs consist of two Azure regions within the same geography, typically at least 300 miles apart. They are used for cross-region replication and disaster recovery, but they do not provide the intra-region redundancy and low-latency connectivity required to protect against a datacenter failure within a single region.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse Availability Zones with Region Pairs, mistakenly thinking that cross-region replication is required for datacenter failure resilience, but the question explicitly specifies 'within the same Azure region' and 'low-latency replication,' which only Availability Zones satisfy.
Detailed technical explanation
How to think about this question
Availability Zones use dedicated, isolated infrastructure with independent power sources, cooling systems, and network fabrics, connected through high-speed, low-latency fiber links (typically less than 2 ms round-trip latency). Under the hood, each zone is a separate fault domain, and Azure ensures synchronous replication for services like Azure SQL Database or managed disks when configured for zone-redundant storage, enabling automatic failover without data loss. In a real-world scenario, a trading application can deploy VMs across three zones and use a load balancer to distribute traffic, ensuring that if one zone fails, the application continues running in the other zones with minimal disruption.
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
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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 Zones — Availability Zones (B) are physically separate datacenters within an Azure region, each with independent power, cooling, and networking. They provide low-latency replication and protect against a complete datacenter failure by allowing the application to run in multiple zones simultaneously, ensuring high availability and resilience within a single region.
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
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.
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