- A
High availability
Why wrong: High availability refers to ensuring that services remain operational and accessible with minimal downtime. It does not specifically describe automatic scaling of resources based on demand.
- B
Elasticity
Elasticity is the correct characteristic. It enables resources (such as virtual machines) to be automatically added or removed in response to changing workload demands, which matches the described requirement.
- C
Fault tolerance
Why wrong: Fault tolerance is the ability of a system to continue operating properly in the event of a failure of one or more components. It does not involve automatic scaling based on load.
- D
Geographic distribution
Why wrong: Geographic distribution refers to deploying resources in multiple geographical locations to reduce latency or meet compliance requirements. It does not address automatic scaling of resources.
AZ-900 Describe cloud concepts Practice Question
This AZ-900 practice question tests your understanding of describe cloud concepts. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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 web application on Azure virtual machines. The application experiences unpredictable traffic patterns with occasional sharp spikes. The operations team wants to configure the infrastructure so that the number of running virtual machines automatically increases during spikes and decreases during low traffic periods, without manual intervention. Which cloud computing characteristic does this requirement describe?
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
Elasticity
Elasticity is the cloud computing characteristic that enables resources to automatically scale out (increase) during demand spikes and scale in (decrease) during low traffic periods, matching capacity to workload in real time. In Azure, this is implemented via Virtual Machine Scale Sets with autoscale rules based on metrics like CPU or memory thresholds, allowing the number of VMs to adjust without manual intervention.
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.
- ✗
High availability
Why it's wrong here
High availability refers to ensuring that services remain operational and accessible with minimal downtime. It does not specifically describe automatic scaling of resources based on demand.
- ✓
Elasticity
Why this is correct
Elasticity is the correct characteristic. It enables resources (such as virtual machines) to be automatically added or removed in response to changing workload demands, which matches the described requirement.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Fault tolerance
Why it's wrong here
Fault tolerance is the ability of a system to continue operating properly in the event of a failure of one or more components. It does not involve automatic scaling based on load.
- ✗
Geographic distribution
Why it's wrong here
Geographic distribution refers to deploying resources in multiple geographical locations to reduce latency or meet compliance requirements. It does not address automatic scaling of resources.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse elasticity with high availability, thinking that automatically adding VMs during spikes is about keeping the app available, but high availability is about redundancy and failover, not dynamic capacity adjustment.
Detailed technical explanation
How to think about this question
Azure Virtual Machine Scale Sets use an autoscale engine that evaluates performance metrics (e.g., CPU percentage, queue depth) against defined rules and schedules, then triggers scale-out or scale-in operations by adding or removing VM instances. The scale-in process uses a 'cool-down' period (default 5 minutes) to prevent flapping, and scale-out events can be configured with a 'scale-out cooldown' to avoid rapid successive additions. In real-world scenarios, combining predictive autoscale with reactive rules can preemptively handle sudden spikes by analyzing historical patterns.
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.
- →
Describe cloud concepts — study guide chapter
Learn the concepts, then practise the questions
- →
Describe cloud concepts practice questions
Targeted practice on this topic area only
- →
All AZ-900 questions
1,031 questions across all exam domains
- →
Microsoft Azure Fundamentals AZ-900 study guide
Full concept coverage aligned to exam objectives
- →
AZ-900 practice test guide
How to use practice tests most effectively before exam day
Related practice questions
Related AZ-900 practice-question pages
Use these pages to review the topic behind this question. This is how one missed question becomes focused revision.
Describe cloud concepts practice questions
Practise AZ-900 questions linked to Describe cloud concepts.
Describe Azure architecture and services practice questions
Practise AZ-900 questions linked to Describe Azure architecture and services.
Describe Azure management and governance practice questions
Practise AZ-900 questions linked to Describe Azure management and governance.
AZ-900 Azure services practice questions
Practise AZ-900 questions linked to AZ-900 Azure services.
AZ-900 pricing and support practice questions
Practise AZ-900 questions linked to AZ-900 pricing and support.
AZ-900 security and compliance practice questions
Practise AZ-900 questions linked to AZ-900 security and compliance.
AZ-900 governance practice questions
Practise AZ-900 questions linked to AZ-900 governance.
Practice this exam
Start a free AZ-900 practice session
Short sessions build daily habit. Longer sessions build exam-day stamina. Try a timed session to simulate real conditions.
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: Elasticity — Elasticity is the cloud computing characteristic that enables resources to automatically scale out (increase) during demand spikes and scale in (decrease) during low traffic periods, matching capacity to workload in real time. In Azure, this is implemented via Virtual Machine Scale Sets with autoscale rules based on metrics like CPU or memory thresholds, allowing the number of VMs to adjust without manual intervention.
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 →
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.
Question Discussion
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
Sign in to join the discussion.