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 startup application experiences unpredictable traffic spikes. The application runs on Azure Virtual Machines. They want the VMs to automatically increase in number during peak times and decrease during low usage, without manual intervention. Which cloud characteristic does this requirement describe?
Elasticity
Elasticity allows automatic scaling of resources based on demand.
High availability
Why wrong: High availability focuses on minimizing downtime, not scaling.
Disaster recovery
Why wrong: Disaster recovery is about recovering from failures, not scaling.
Geo-redundancy
Why wrong: Geo-redundancy is a data replication strategy, not a scaling characteristic.
Answer choices
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 enables resources to automatically scale out (increase) during high demand and scale in (decrease) during low demand, matching capacity to workload in real time. In this scenario, Azure Virtual Machines can be configured with autoscale rules (e.g., based on CPU > 75% for 5 minutes) to add or remove VM instances without manual intervention. This directly addresses the startup's need to handle unpredictable traffic spikes while optimizing cost.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
Elasticity
Why this is correct
Elasticity allows automatic scaling of resources based on demand.
Related concept
Read the scenario before looking for a memorised answer.
High availability
Why it's wrong here
High availability focuses on minimizing downtime, not scaling.
Disaster recovery
Why it's wrong here
Disaster recovery is about recovering from failures, not scaling.
Geo-redundancy
Why it's wrong here
Geo-redundancy is a data replication strategy, not a scaling characteristic.
Common exam traps
The trap here is that candidates confuse elasticity (dynamic scaling) with high availability (fault tolerance), because both involve multiple VMs, but elasticity is specifically about adjusting capacity to demand, not about maintaining uptime during failures.
Detailed technical explanation
Under the hood, Azure autoscale uses Azure Monitor metrics (e.g., CPU percentage, queue depth) and triggers scale actions via ARM REST API calls to the Virtual Machine Scale Set (VMSS) orchestrator. A subtle behavior is the 'cool-down' period (default 5 minutes) that prevents flapping—where rapid scale-in/out cycles occur due to transient metric spikes. In a real-world scenario, a startup running a web app on VMSS might set a scale-out rule when average CPU exceeds 80% for 10 minutes and a scale-in rule when CPU drops below 30% for 10 minutes, ensuring cost efficiency during unpredictable traffic.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A startup's cloud architect reviews their monthly bill and notices costs are higher than expected for a long-running batch job. Switching from on-demand instances to Reserved Instances — or using Spot/Preemptible VMs — can reduce compute costs by up to 72 %. Questions like this test whether you understand the tradeoffs between commitment, flexibility, and cost across cloud pricing models.
What to study next
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FAQ
Describe cloud concepts — This question tests Describe cloud concepts — Read the scenario before looking for a memorised answer..
The correct answer is: Elasticity — Elasticity is the cloud characteristic that enables resources to automatically scale out (increase) during high demand and scale in (decrease) during low demand, matching capacity to workload in real time. In this scenario, Azure Virtual Machines can be configured with autoscale rules (e.g., based on CPU > 75% for 5 minutes) to add or remove VM instances without manual intervention. This directly addresses the startup's need to handle unpredictable traffic spikes while optimizing cost.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 11, 2026
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