- A
Measured service
Why wrong: Measured service means that cloud providers meter and report resource usage for billing and optimization. While usage is measured in autoscaling, the primary characteristic demonstrated is the ability to scale dynamically, not the metering aspect.
- B
Rapid elasticity
Rapid elasticity is the correct answer because the autoscale configuration automatically adds and removes virtual machines based on CPU demand, enabling the system to elastically scale outward and inward. This is a core characteristic of cloud computing defined by NIST.
- C
Resource pooling
Why wrong: Resource pooling refers to the provider's computing resources being pooled to serve multiple consumers using a multi-tenant model. This scenario does not highlight multi-tenancy; it focuses on dynamic scaling of a single application.
- D
Broad network access
Why wrong: Broad network access means that cloud resources are available over the network and accessed through standard mechanisms (e.g., internet). While true for Azure VMs, the scenario specifically illustrates scaling, not network accessibility.
AZ-900 Describe cloud concepts Practice Question
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 company runs an e-commerce web application on a set of Azure virtual machines behind a load balancer. The application experiences unpredictable traffic surges during flash sales. The company configures an autoscale setting that automatically adds virtual machines when the average CPU usage across the existing VMs exceeds 75% for five minutes, and removes virtual machines when CPU usage drops below 30% for ten minutes. Which essential characteristic of cloud computing does this configuration primarily demonstrate?
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
Rapid elasticity
B is correct because the autoscale configuration dynamically adds and removes virtual machines in response to real-time CPU usage thresholds, which is the defining characteristic of rapid elasticity. This allows the e-commerce application to scale computing resources up and down automatically and seamlessly to match unpredictable traffic surges, ensuring performance during flash sales without manual intervention.
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.
- ✗
Measured service
Why it's wrong here
Measured service means that cloud providers meter and report resource usage for billing and optimization. While usage is measured in autoscaling, the primary characteristic demonstrated is the ability to scale dynamically, not the metering aspect.
- ✓
Rapid elasticity
Why this is correct
Rapid elasticity is the correct answer because the autoscale configuration automatically adds and removes virtual machines based on CPU demand, enabling the system to elastically scale outward and inward. This is a core characteristic of cloud computing defined by NIST.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Resource pooling
Why it's wrong here
Resource pooling refers to the provider's computing resources being pooled to serve multiple consumers using a multi-tenant model. This scenario does not highlight multi-tenancy; it focuses on dynamic scaling of a single application.
- ✗
Broad network access
Why it's wrong here
Broad network access means that cloud resources are available over the network and accessed through standard mechanisms (e.g., internet). While true for Azure VMs, the scenario specifically illustrates scaling, not network accessibility.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may confuse rapid elasticity with measured service because both involve resource usage, but measured service is about billing and monitoring usage, not the ability to dynamically scale resources up or down.
Trap categories for this question
Scenario analysis trap
Resource pooling refers to the provider's computing resources being pooled to serve multiple consumers using a multi-tenant model. This scenario does not highlight multi-tenancy; it focuses on dynamic scaling of a single application.
Detailed technical explanation
How to think about this question
Under the hood, Azure autoscale uses metrics from the Azure Monitor service, such as the Percentage CPU metric collected at 1-minute intervals, and evaluates the average over the specified duration (5 minutes for scale-out, 10 minutes for scale-in). The scale-out and scale-in rules are defined in an autoscale profile, which can include cool-down periods (e.g., 5 minutes) to prevent flapping—a scenario where VMs are repeatedly added and removed due to rapid metric oscillations. In a real-world flash sale, this prevents over-provisioning costs while maintaining responsiveness.
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
A company's IT admin needs to give a contractor read-only access to production logs without sharing account credentials. Using role-based access control (RBAC) and temporary scoped permissions — not a permanent shared password — is the correct pattern. Questions like this test whether you can apply least-privilege access across cloud identity services.
What to study next
Got this wrong? Here's your next step.
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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: Rapid elasticity — B is correct because the autoscale configuration dynamically adds and removes virtual machines in response to real-time CPU usage thresholds, which is the defining characteristic of rapid elasticity. This allows the e-commerce application to scale computing resources up and down automatically and seamlessly to match unpredictable traffic surges, ensuring performance during flash sales without manual intervention.
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.
About these practice questions
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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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