- A
Elasticity
Elasticity is correct. It refers to the ability to automatically scale resources up or down based on real-time demand, ensuring you only pay for what you use. This matches the scenario of adding resources during holiday peaks and removing them afterward.
- B
Scalability
Why wrong: Scalability is a related concept that focuses on increasing capacity to handle growing workloads over time, but it does not inherently include the ability to automatically reduce resources when demand decreases. Elasticity adds the dynamic bi-directional scaling, which is required here.
- C
High availability
Why wrong: High availability ensures that applications remain accessible despite component failures, typically by using redundancy and failover. It does not address the automatic provisioning or deprovisioning of resources based on demand, which is the core requirement in this scenario.
- D
Fault tolerance
Why wrong: Fault tolerance enables a system to continue operating without interruption even if one or more components fail. While important for reliability, it does not describe the ability to dynamically adjust capacity in response to changing demand, which is the primary need here.
AZ-900 Describe cloud concepts Practice Question
This AZ-900 practice question tests your understanding of describe cloud concepts. 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 retail company runs an e-commerce application on Azure virtual machines during peak holiday seasons. The application experiences high traffic for a few weeks each year. The IT team wants to automatically provision additional compute resources during high demand and remove them when demand drops, ensuring that the company only pays for resources while they are actively in use. Which cloud computing characteristic does this approach primarily rely on?
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
This approach relies on elasticity, which is the ability of a cloud system to automatically scale resources up or down based on real-time demand. In this scenario, Azure virtual machines are provisioned during peak holiday traffic and deprovisioned when demand drops, ensuring the company only pays for resources while they are actively in use. Elasticity specifically handles dynamic, short-term fluctuations, whereas scalability is a broader term for handling long-term growth.
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.
- ✓
Elasticity
Why this is correct
Elasticity is correct. It refers to the ability to automatically scale resources up or down based on real-time demand, ensuring you only pay for what you use. This matches the scenario of adding resources during holiday peaks and removing them afterward.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Scalability
Why it's wrong here
Scalability is a related concept that focuses on increasing capacity to handle growing workloads over time, but it does not inherently include the ability to automatically reduce resources when demand decreases. Elasticity adds the dynamic bi-directional scaling, which is required here.
- ✗
High availability
Why it's wrong here
High availability ensures that applications remain accessible despite component failures, typically by using redundancy and failover. It does not address the automatic provisioning or deprovisioning of resources based on demand, which is the core requirement in this scenario.
- ✗
Fault tolerance
Why it's wrong here
Fault tolerance enables a system to continue operating without interruption even if one or more components fail. While important for reliability, it does not describe the ability to dynamically adjust capacity in response to changing demand, which is the primary need here.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse elasticity with scalability, but elasticity specifically implies automatic, dynamic scaling in response to real-time demand changes, while scalability is a broader capability that may require manual intervention or be used for planned growth.
Trap categories for this question
Scenario analysis trap
High availability ensures that applications remain accessible despite component failures, typically by using redundancy and failover. It does not address the automatic provisioning or deprovisioning of resources based on demand, which is the core requirement in this scenario.
Detailed technical explanation
How to think about this question
Under the hood, Azure implements elasticity through features like Virtual Machine Scale Sets (VMSS) and autoscale rules that integrate with Azure Monitor metrics (e.g., CPU percentage or queue depth). The autoscale engine uses a scale-out and scale-in policy with cool-down periods to avoid thrashing, and it leverages Azure Resource Manager to programmatically create or delete VMs. In a real-world scenario, a retail company might use a custom metric like 'requests per second' to trigger a scale-out event, ensuring new VMs are ready within minutes to handle Black Friday traffic.
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 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 — This approach relies on elasticity, which is the ability of a cloud system to automatically scale resources up or down based on real-time demand. In this scenario, Azure virtual machines are provisioned during peak holiday traffic and deprovisioned when demand drops, ensuring the company only pays for resources while they are actively in use. Elasticity specifically handles dynamic, short-term fluctuations, whereas scalability is a broader term for handling long-term growth.
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.
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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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