AZ-900 Describe cloud concepts Practice Question
A company needs to burst compute capacity during a seasonal sale event. They plan to use Azure virtual machines to handle the extra load and then release them after the event. They want to pay only for the extra resources used during that period. Which cloud characteristic best describes this?
⚠ Common exam trap
Test-takers frequently confuse elasticity with high availability, mistakenly thinking that adding more VMs for a burst is about keeping the system up, rather than understanding that elasticity is specifically about dynamic scaling to match demand and optimize cost.
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 characteristic that allows resources to automatically scale up to meet increased demand and scale down when demand decreases, ensuring you only pay for what you use. In this scenario, the company needs to burst compute capacity for a seasonal sale event and then release the VMs afterward, which is a textbook example of elasticity. This contrasts with other characteristics like high availability or geo-redundancy, which focus on uptime and data replication rather than dynamic scaling.
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 the ability of a cloud system to automatically scale computing resources out (adding virtual machines, containers, or functions) during a demand spike and scale them back in when the spike subsides. This dynamic provisioning is typically driven by autoscaling policies based on metrics such as CPU utilization or request count. Because cloud usage is metered, you only pay for the extra capacity consumed during the seasonal burst, which directly matches the scenario of handling a temporary peak load.
- ✗
High availability
Why it's wrong here
High availability refers to the design of a system to remain operational and accessible for a high percentage of time, typically achieved through redundant components, load balancing, and automatic failover within a region. It focuses on minimizing downtime and ensuring business continuity in the face of individual component failures, not on adjusting capacity to meet fluctuating demand. While a highly available system might survive a node failure, it does not automatically add extra compute capacity to handle a seasonal sales surge; that is the role of elasticity.
When this WOULD be correct
A question asking about a solution that keeps a critical application running without interruption during a regional outage would make high availability correct, such as deploying VMs in an availability set.
- ✗
Geo-redundancy
Why it's wrong here
Geo-redundancy is a data durability and disaster recovery strategy that replicates workloads and data to one or more geographically separated Azure regions. This protects against large-scale regional outages and ensures data survives localized disasters, but it does not inherently provide the ability to scale compute capacity dynamically based on demand. Even if you have geo-replicated resources, you would still need autoscaling to burst compute power for a seasonal event; geo-redundancy is about location resilience, not temporary capacity expansion.
When this WOULD be correct
A company requires that its application remains available even if an entire Azure region experiences an outage. Which cloud characteristic describes this requirement?
- ✗
Agility
Why it's wrong here
Agility in the cloud is the capability to quickly provision, configure, and deploy resources and applications, often through infrastructure as code and automated pipelines. It allows an organization to respond rapidly to changing business requirements, such as spinning up a new service or environment in minutes. However, agility refers to the speed and ease of creating these resources, not the characteristic of automatically scaling out and in to match variable demand; that continuous, demand-driven scaling is specifically termed elasticity.
When this WOULD be correct
A company needs to rapidly deploy a new application to market within weeks to respond to a competitor's move. Which cloud characteristic enables this fast provisioning and deployment?
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 the ability of a cloud system to automatically scale computing resources out (adding virtual machines, containers, or functions) during a demand spike and scale them back in when the spike subsides. This dynamic provisioning is typically driven by autoscaling policies based on metrics such as CPU utilization or request count. Because cloud usage is metered, you only pay for the extra capacity consumed during the seasonal burst, which directly matches the scenario of handling a temporary peak load.
✗High availabilityWrong answer — click to see why▾
Why this is wrong here
High availability ensures that applications remain operational during failures, but the question focuses on dynamically scaling resources up and down to match demand, which is elasticity.
★ When this WOULD be the correct answer
A question asking about a solution that keeps a critical application running without interruption during a regional outage would make high availability correct, such as deploying VMs in an availability set.
Why candidates choose this
Candidates may confuse the ability to handle extra load (elasticity) with ensuring continuous operation (high availability), especially when both involve multiple VMs.
✗Geo-redundancyWrong answer — click to see why▾
Why this is wrong here
Geo-redundancy refers to replicating data or services across multiple geographic regions to protect against regional failures, not to scaling resources up or down based on demand.
★ When this WOULD be the correct answer
A company requires that its application remains available even if an entire Azure region experiences an outage. Which cloud characteristic describes this requirement?
Why candidates choose this
Candidates may confuse geo-redundancy with the ability to handle increased load, as both involve distributing resources across regions, but geo-redundancy is about disaster recovery, not elasticity.
✗AgilityWrong answer — click to see why▾
Why this is wrong here
Agility refers to the speed at which a company can adapt to changes, not specifically to the ability to scale resources up and down on demand. The scenario describes bursting compute capacity, which is a hallmark of elasticity.
★ When this WOULD be the correct answer
A company needs to rapidly deploy a new application to market within weeks to respond to a competitor's move. Which cloud characteristic enables this fast provisioning and deployment?
Why candidates choose this
Candidates may confuse agility with elasticity because both involve quick responses to changing needs, but agility is about speed of adaptation overall, not resource 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
High availability
High availability is a system design approach that aims to keep applications and services operational and accessible with minimal downtime, even when some components fail.
Key term
Availability
Availability is the measure of how often a system or service is operational and accessible when needed, typically expressed as a percentage of uptime.
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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.