- A
Rapid elasticity
Why wrong: Rapid elasticity refers to the ability to quickly scale resources up or down, often automatically, to meet demand. The scenario describes a billing model based on actual consumption, not the speed of scaling.
- B
Resource pooling
Why wrong: Resource pooling means the provider's computing resources are shared across multiple customers, with resources dynamically assigned as needed. The scenario focuses on pay-per-use billing, not multi-tenancy or resource sharing.
- C
Measured service
Measured service is correct because cloud providers meter resource usage (e.g., VM compute hours) and bill customers accordingly. The company pays only for the hours VMs are running, which is the essence of consumption-based billing.
- D
Broad network access
Why wrong: Broad network access means cloud resources are accessible over the internet via standard protocols (e.g., HTTPS, RDP) from a variety of devices. The scenario does not describe network accessibility; it describes a billing model.
Quick Answer
The answer is measured service, the cloud characteristic that meters resource usage and bills based on actual consumption. In the scenario, the retail company only pays for the compute hours its Azure VMs are actively running, with no charges incurred during the Stopped (deallocated) state, directly demonstrating how measured service enables pay-as-you-go pricing. On the Microsoft Azure Fundamentals AZ-900 exam, this concept tests your understanding of how cloud providers track and bill for resources like virtual machine uptime, storage, or data transfer, often appearing in scenarios involving cost optimization or automation. A common trap is confusing measured service with on-demand self-service, but remember: measured service is about the metering and billing of usage, not the ability to provision resources without human interaction. To lock it in, think of a utility bill—you pay for the kilowatt-hours you actually use, not for the capacity sitting idle.
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 retail company migrates its e-commerce platform to Azure Virtual Machines. The workload is seasonal, with high traffic during holiday sales and low traffic otherwise. To manage costs, the IT team configures Azure Automation to power off VMs during low-traffic periods and power them back on when demand increases. The company's monthly bill reflects charges only for the hours each VM was actually running; no charges are incurred for the time the VMs were in the 'Stopped (deallocated)' state. This consumption-based billing model is a direct example of which fundamental characteristic of cloud computing?
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
Measured service
The correct answer is C because the scenario describes a consumption-based billing model where charges are incurred only for the hours each VM is actually running, and no charges apply when VMs are in the 'Stopped (deallocated)' state. This directly exemplifies the 'measured service' characteristic of cloud computing, where resource usage (e.g., compute hours) is metered and billed based on actual consumption, enabling pay-as-you-go pricing.
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.
- ✗
Rapid elasticity
Why it's wrong here
Rapid elasticity refers to the ability to quickly scale resources up or down, often automatically, to meet demand. The scenario describes a billing model based on actual consumption, not the speed of scaling.
- ✗
Resource pooling
Why it's wrong here
Resource pooling means the provider's computing resources are shared across multiple customers, with resources dynamically assigned as needed. The scenario focuses on pay-per-use billing, not multi-tenancy or resource sharing.
- ✓
Measured service
Why this is correct
Measured service is correct because cloud providers meter resource usage (e.g., VM compute hours) and bill customers accordingly. The company pays only for the hours VMs are running, which is the essence of consumption-based billing.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Broad network access
Why it's wrong here
Broad network access means cloud resources are accessible over the internet via standard protocols (e.g., HTTPS, RDP) from a variety of devices. The scenario does not describe network accessibility; it describes a billing model.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse 'measured service' with 'rapid elasticity' because both involve dynamic behavior, but measured service is about metering and billing, while rapid elasticity is about scaling resources automatically to match demand.
Trap categories for this question
Scenario analysis trap
Rapid elasticity refers to the ability to quickly scale resources up or down, often automatically, to meet demand. The scenario describes a billing model based on actual consumption, not the speed of scaling.
Detailed technical explanation
How to think about this question
Under the hood, Azure bills for VMs based on the 'allocated' state: when a VM is 'Stopped (deallocated)', the underlying physical resources (CPU, memory) are released back to the pool, and billing stops; however, if a VM is simply 'Stopped' (not deallocated), resources remain reserved and charges continue. This metering is tracked via Azure Metering Services, which logs resource consumption in 1-minute increments for compute hours, and the measured service model ensures customers only pay for what they use, not for idle capacity.
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 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
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: Measured service — The correct answer is C because the scenario describes a consumption-based billing model where charges are incurred only for the hours each VM is actually running, and no charges apply when VMs are in the 'Stopped (deallocated)' state. This directly exemplifies the 'measured service' characteristic of cloud computing, where resource usage (e.g., compute hours) is metered and billed based on actual consumption, enabling pay-as-you-go pricing.
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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Same concept, more angles
1 more ways this is tested on AZ-900
These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. A company uses Azure to host its virtual machines and storage. The company receives a monthly invoice that charges based on the exact number of virtual machine hours and gigabytes of storage consumed. No upfront payment is required. Which characteristic of cloud computing does this billing model represent?
easy- A.Rapid elasticity
- B.Resource pooling
- ✓ C.Measured service
- D.On-demand self-service
Why C: The billing model charges based on exact virtual machine hours and gigabytes of storage consumed, with no upfront payment. This directly reflects the measured service characteristic of cloud computing, where resource usage is metered, monitored, and billed according to consumption. Azure tracks usage metrics (e.g., VM runtime in hours, storage in GB-months) via its meters and generates invoices based on these precise measurements.
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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