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 company currently budgets for maximum capacity to handle peak loads, resulting in underutilized resources during off-peak times. They want a model where they can quickly adjust resources up or down based on demand. Which cloud characteristic directly addresses this concern?
Correct. Elasticity enables automatic scaling of resources based on demand, matching capacity to actual usage.
B
High availability
Why wrong: Incorrect. High availability ensures services remain accessible during failures, but does not directly address dynamic scaling of resources.
C
Geo-redundancy
Why wrong: Incorrect. Geo-redundancy replicates resources across regions for disaster recovery, not for scaling based on demand.
D
Fault tolerance
Why wrong: Incorrect. Fault tolerance enables a system to continue operating despite component failures, but does not provide the ability to scale resources up or down.
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 automatic scaling of resources up or down in response to real-time demand. This directly addresses the company's need to avoid over-provisioning for peak loads while still being able to handle spikes without manual intervention, typically implemented through auto-scaling policies in services like Azure Virtual Machine Scale Sets or Azure App Service autoscale.
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
Correct. Elasticity enables automatic scaling of resources based on demand, matching capacity to actual usage.
Related concept
Read the scenario before looking for a memorised answer.
✗
High availability
Why it's wrong here
Incorrect. High availability ensures services remain accessible during failures, but does not directly address dynamic scaling of resources.
✗
Geo-redundancy
Why it's wrong here
Incorrect. Geo-redundancy replicates resources across regions for disaster recovery, not for scaling based on demand.
✗
Fault tolerance
Why it's wrong here
Incorrect. Fault tolerance enables a system to continue operating despite component failures, but does not provide the ability to scale resources up or down.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse 'high availability' (always-on redundancy) with 'elasticity' (dynamic scaling), but the question explicitly asks about adjusting resources based on demand, not about maintaining uptime during failures.
Detailed technical explanation
How to think about this question
Under the hood, elasticity relies on monitoring metrics such as CPU utilization, memory pressure, or queue depth, triggering Azure Autoscale to add or remove VM instances via the Azure Resource Manager API. A subtle behavior is the 'cool-down' period (default 5 minutes) that prevents flapping—rapid scaling actions caused by brief metric spikes—which can lead to unnecessary costs if not configured correctly. In a real-world scenario, an e-commerce site using Azure Functions with consumption plan automatically scales out to hundreds of instances during a flash sale and scales to zero when idle, directly solving the underutilization problem.
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.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this AZ-900 question in full detail.
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 characteristic that enables automatic scaling of resources up or down in response to real-time demand. This directly addresses the company's need to avoid over-provisioning for peak loads while still being able to handle spikes without manual intervention, typically implemented through auto-scaling policies in services like Azure Virtual Machine Scale Sets or Azure App Service autoscale.
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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Question Discussion
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