- A
Availability Zones
Correct. Availability Zones are unique physical locations within an Azure region, each with independent infrastructure. Deploying across zones ensures that a failure in one datacenter does not affect resources in other zones.
- B
Region Pairs
Why wrong: Incorrect. Region Pairs provide disaster recovery across two Azure regions, which is designed to protect against a full region outage, not a single datacenter failure within a region.
- C
Fault Domains
Why wrong: Incorrect. Fault Domains represent groups of hardware that share a common power source and network switch within the same datacenter. They protect against rack-level failures, not an entire datacenter outage.
- D
Resource Groups
Why wrong: Incorrect. Resource Groups are logical containers for grouping Azure resources. They do not provide any availability or redundancy features.
Quick Answer
The answer is Availability Zones. This is the correct choice because Availability Zones are physically separate datacenters within a single Azure region, each with independent power, cooling, and networking. By deploying your virtual machines across multiple zones, your application survives the complete failure of one datacenter, as the other zones remain operational. On the AZ-900 exam, this question tests your understanding of high-availability architecture within a region, and it often appears alongside a trap answer: Region Pairs. Remember that Region Pairs protect against region-wide disasters, not a single datacenter outage—they are geographically separated and used for disaster recovery, not for intra-region redundancy. A simple memory tip: think of Zones as “within the same city” (region) and Pairs as “between two cities.” For surviving a single datacenter failure, always choose Availability Zones.
AZ-900 Describe cloud concepts Practice Question
This AZ-900 practice question tests your understanding of describe cloud concepts. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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 is deploying a mission-critical application on Azure virtual machines. The solution must remain operational even if a single Azure datacenter within a region experiences a complete outage. Which Azure feature should the company use to protect against this specific failure scenario?
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 are physically separate datacenters within an Azure region, each with independent power, cooling, and networking. By deploying the application across multiple zones, the solution remains operational if one entire datacenter fails, as the other zones continue to serve traffic. This directly addresses the requirement to survive a single datacenter outage within a 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 Zones
Why this is correct
Correct. Availability Zones are unique physical locations within an Azure region, each with independent infrastructure. Deploying across zones ensures that a failure in one datacenter does not affect resources in other zones.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Region Pairs
Why it's wrong here
Incorrect. Region Pairs provide disaster recovery across two Azure regions, which is designed to protect against a full region outage, not a single datacenter failure within a region.
- ✗
Fault Domains
Why it's wrong here
Incorrect. Fault Domains represent groups of hardware that share a common power source and network switch within the same datacenter. They protect against rack-level failures, not an entire datacenter outage.
- ✗
Resource Groups
Why it's wrong here
Incorrect. Resource Groups are logical containers for grouping Azure resources. They do not provide any availability or redundancy features.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse Availability Zones (which protect against datacenter failures within a region) with Region Pairs (which protect against region-wide disasters), leading them to choose Region Pairs even though the question specifies a single datacenter outage within a region.
Detailed technical explanation
How to think about this question
Each Availability Zone is a unique physical location with its own independent infrastructure, including separate power sources, cooling systems, and network connectivity. Azure guarantees at least 99.99% uptime for VMs deployed across two or more zones within the same region. Under the hood, zone-redundant services use load balancers (like Azure Standard Load Balancer) to distribute traffic across zone-specific endpoints, ensuring automatic failover 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
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.
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 cloud concepts — study guide chapter
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FAQ
Questions learners often ask
What does this AZ-900 question test?
Describe cloud concepts — This question tests Describe cloud concepts — 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 are physically separate datacenters within an Azure region, each with independent power, cooling, and networking. By deploying the application across multiple zones, the solution remains operational if one entire datacenter fails, as the other zones continue to serve traffic. This directly addresses the requirement to survive a single datacenter outage within a 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
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
Same concept, more angles
1 more ways this is tested on AZ-900
These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. A company runs a critical web application on Azure virtual machines. To ensure the application remains accessible even if an entire Azure datacenter becomes unavailable due to a power outage, the company deploys virtual machines in two different Azure regions and uses Azure Traffic Manager to automatically route traffic to the healthy region. Which benefit of cloud computing does this configuration primarily demonstrate?
medium- A.Elasticity
- ✓ B.High availability
- C.Cost reduction
- D.Security
Why B: This configuration demonstrates high availability because it uses Azure Traffic Manager to route traffic across two Azure regions, ensuring the application remains accessible even if an entire datacenter fails. High availability focuses on minimizing downtime by eliminating single points of failure, which is exactly what deploying VMs in multiple regions with traffic routing achieves.
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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