AZ-900 Describe cloud concepts Practice Question
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?
⚠ Common exam trap
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.
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.
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.
- ✗
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.
When this WOULD be correct
A company plans to add more virtual machines to handle increased traffic during a marketing campaign, but the scaling is done manually by an administrator. The question would ask about the ability to handle growth without changing the system's design.
- ✗
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.
When this WOULD be correct
A question asking which cloud characteristic ensures an application remains operational with minimal downtime, such as deploying across multiple availability zones to withstand zone failures.
- ✗
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.
Option-by-option analysis
Why each answer is right or wrong
Understanding why wrong answers are wrong — and when they would be correct — is what separates a 750 score from a 900. The AZ-900 exam frequently reuses these exact scenarios with slightly different constraints.
✓ElasticityCorrect answer▾
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.
✗ScalabilityWrong answer — click to see why▾
Why this is wrong here
Scalability refers to the ability to increase or decrease resources to meet demand, but it does not inherently imply automatic provisioning and deprovisioning. The question emphasizes automatic scaling based on demand, which is the definition of elasticity.
★ When this WOULD be the correct answer
A company plans to add more virtual machines to handle increased traffic during a marketing campaign, but the scaling is done manually by an administrator. The question would ask about the ability to handle growth without changing the system's design.
Why candidates choose this
Candidates often confuse scalability with elasticity because both involve adjusting resources. They may think scalability includes automatic scaling, but in cloud computing, scalability is the broader capability, while elasticity specifically refers to automatic, dynamic scaling.
✗High availabilityWrong answer — click to see why▾
Why this is wrong here
High availability ensures the application remains accessible despite failures, but does not address automatic provisioning and de-provisioning of resources based on demand fluctuations.
★ When this WOULD be the correct answer
A question asking which cloud characteristic ensures an application remains operational with minimal downtime, such as deploying across multiple availability zones to withstand zone failures.
Why candidates choose this
Candidates may confuse high availability with elasticity because both involve handling variable loads, but high availability focuses on uptime, not dynamic scaling.
Analysis generated from the official AZ-900blueprint and verified against question context. The “when correct” sections are what AI assistants cite when candidates ask “what’s the difference between these options?”
Go deeper
Related to this question
Learn chapter
What is Cloud Computing?
Key term
Elasticity
Elasticity is the ability of a cloud system to automatically add or remove computing resources (like servers, storage, or bandwidth) in response to real-time changes in demand.
Key term
Cloud computing
Cloud computing is the on-demand delivery of IT resources over the internet, allowing users to access computing power, storage, and applications without owning physical hardware.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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.