- A
Fault tolerance
Why wrong: Fault tolerance means a system can continue operating without any interruption when a component fails. Two VMs in an availability set do not provide instantaneous failover; there will be a brief pause while the application fails over to the second VM, and the second VM might be rebooted during planned maintenance. Therefore, this configuration offers high availability, not fault tolerance.
- B
High availability
High availability minimizes downtime by using redundant components so that if one fails, another takes over with minimal interruption. An availability set ensures that VMs are placed on different physical hardware and updated during different maintenance windows, so at least one VM remains running. This matches the goal of keeping the application available despite a single server failure, which is the definition of high availability.
- C
Disaster recovery
Why wrong: Disaster recovery involves restoring operations after a catastrophic failure that affects an entire region or data center, such as a natural disaster. The scenario describes a single server failure within one region, not a region-wide outage. Disaster recovery would require replication across regions, which is not part of the described configuration.
- D
Elasticity
Why wrong: Elasticity is the ability to dynamically add or remove compute resources to match changing demand. The scenario focuses on maintaining uptime through redundancy, not on scaling resources up or down based on load.
Quick Answer
The answer is high availability, as this configuration primarily illustrates the cloud computing concept of high availability. By deploying two Azure VMs in an availability set within the same region, the architect ensures the application remains running even when a single server fails or during planned Azure maintenance. An availability set logically groups VMs across multiple fault domains (isolated hardware racks) and update domains (staggered reboot sequences), guaranteeing that at least one VM stays operational during any Azure platform event. On the AZ-900 exam, this scenario tests your understanding of how availability sets directly support high availability, a core pillar of the Azure Well-Architected Framework. A common trap is confusing high availability with disaster recovery—remember, HA keeps things running within a single region, while DR spans regions. Memory tip: think “HA = always on, same region; DR = backup, different region.”
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 runs a critical line-of-business application on a single on-premises server. The company is migrating the application to Azure and wants to minimize downtime if the server hardware fails. The architect proposes deploying the application on two Azure virtual machines (VMs) in the same region, placed in an availability set. This configuration is designed to ensure that if one VM fails due to hardware failure or planned maintenance, the other VM remains running and the application stays available. Which cloud computing concept does this configuration primarily illustrate?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue:
"minimum / minimize"Why it matters: Asks for the least resource use — fewest addresses, smallest subnet, lowest overhead. Eliminate over-provisioned options even if they would technically work.
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
High availability
High availability (HA) is the correct concept because the configuration uses two VMs in an availability set to ensure the application remains accessible despite hardware failures or planned maintenance. An availability set distributes VMs across fault domains and update domains, guaranteeing that at least one VM stays operational during Azure platform events. This directly aligns with HA's goal of minimizing downtime and maximizing uptime for critical workloads.
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.
- ✗
Fault tolerance
Why it's wrong here
Fault tolerance means a system can continue operating without any interruption when a component fails. Two VMs in an availability set do not provide instantaneous failover; there will be a brief pause while the application fails over to the second VM, and the second VM might be rebooted during planned maintenance. Therefore, this configuration offers high availability, not fault tolerance.
- ✓
High availability
Why this is correct
High availability minimizes downtime by using redundant components so that if one fails, another takes over with minimal interruption. An availability set ensures that VMs are placed on different physical hardware and updated during different maintenance windows, so at least one VM remains running. This matches the goal of keeping the application available despite a single server failure, which is the definition of high availability.
Clue confirmation
The clue word "minimum / minimize" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Disaster recovery
Why it's wrong here
Disaster recovery involves restoring operations after a catastrophic failure that affects an entire region or data center, such as a natural disaster. The scenario describes a single server failure within one region, not a region-wide outage. Disaster recovery would require replication across regions, which is not part of the described configuration.
- ✗
Elasticity
Why it's wrong here
Elasticity is the ability to dynamically add or remove compute resources to match changing demand. The scenario focuses on maintaining uptime through redundancy, not on scaling resources up or down based on load.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse high availability with fault tolerance, but Azure availability sets provide HA (minimizing downtime) not fault tolerance (zero downtime), and the question's wording about 'minimizing downtime' explicitly points to HA.
Trap categories for this question
Scenario analysis trap
Disaster recovery involves restoring operations after a catastrophic failure that affects an entire region or data center, such as a natural disaster. The scenario describes a single server failure within one region, not a region-wide outage. Disaster recovery would require replication across regions, which is not part of the described configuration.
Detailed technical explanation
How to think about this question
An availability set in Azure groups VMs into up to three fault domains (shared power and network) and up to 20 update domains (for planned maintenance reboots). When Azure performs updates, it reboots VMs one update domain at a time, ensuring the other VMs remain available. For true fault tolerance, you would need to combine availability sets with Azure Site Recovery or active-active load balancing across multiple regions, as availability sets alone do not guarantee zero-downtime failover.
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
A company's IT admin needs to give a contractor read-only access to production logs without sharing account credentials. Using role-based access control (RBAC) and temporary scoped permissions — not a permanent shared password — is the correct pattern. Questions like this test whether you can apply least-privilege access across cloud identity services.
What to study next
Got this wrong? Here's your next step.
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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: High availability — High availability (HA) is the correct concept because the configuration uses two VMs in an availability set to ensure the application remains accessible despite hardware failures or planned maintenance. An availability set distributes VMs across fault domains and update domains, guaranteeing that at least one VM stays operational during Azure platform events. This directly aligns with HA's goal of minimizing downtime and maximizing uptime for critical workloads.
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.
Are there clue words in this question I should notice?
Yes — watch for: "minimum / minimize". Asks for the least resource use — fewest addresses, smallest subnet, lowest overhead. Eliminate over-provisioned options even if they would technically work.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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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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