AZ-900 Describe cloud concepts Practice Question
A company uses Azure to host a web application. The finance team reviews the monthly invoice and notices that the charges are based on the exact number of hours each virtual machine was running, the amount of storage consumed, and the volume of data transferred out of Azure. They did not pay a fixed upfront cost. Which cloud computing characteristic does this billing model best illustrate?
⚠ Common exam trap
Many candidates confuse 'measured service' with 'on-demand self-service' because both involve user-driven actions, but measured service specifically refers to the metering and billing aspect, not the provisioning capability.
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 billing model described—charging based on exact hours of VM runtime, storage consumed, and data transfer out—directly aligns with the 'measured service' characteristic of cloud computing. This characteristic means cloud providers meter and bill for resource usage at a granular level (e.g., per hour, per GB), with no upfront fixed cost, enabling a pay-as-you-go model. Azure implements this through its usage meters and billing APIs, which track consumption precisely for each resource.
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 scale resources up or down quickly, often automatically, in response to demand. While Azure can scale resources, the billing model described is not directly about elasticity; it is about how usage is metered and billed.
When this WOULD be correct
A question that asks: 'A company's web application experiences sudden spikes in traffic, and Azure automatically provisions additional virtual machines within minutes to handle the load, then deallocates them when traffic decreases. Which cloud characteristic does this demonstrate?'
- ✓
Measured service
Why this is correct
Correct. Measured service means that cloud providers meter usage and charge based on actual consumption (e.g., compute hours, storage GB, data transfer). The lack of a fixed upfront cost and billing based on exact usage is the hallmark of measured service.
- ✗
Resource pooling
Why it's wrong here
Resource pooling refers to the provider's computing resources being pooled to serve multiple customers, with physical and virtual resources dynamically assigned. The billing model is not about how resources are pooled but about how consumption is measured.
When this WOULD be correct
A question that asks: 'A cloud provider serves multiple customers from the same physical hardware, but customers cannot see each other's data. Which characteristic does this describe?' would have Resource pooling as the correct answer.
- ✗
On-demand self-service
Why it's wrong here
On-demand self-service means a consumer can provision computing capabilities (e.g., server time, network storage) as needed automatically without requiring human interaction with each service provider. The billing model is a separate characteristic, though on-demand self-service often leads to measured billing.
When this WOULD be correct
A company wants to provision a virtual machine through the Azure portal without contacting support or submitting a request. Which cloud characteristic does this describe?
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.
✓Measured serviceCorrect answer▾
Why this is correct
Correct. Measured service means that cloud providers meter usage and charge based on actual consumption (e.g., compute hours, storage GB, data transfer). The lack of a fixed upfront cost and billing based on exact usage is the hallmark of measured service.
✗Rapid elasticityWrong answer — click to see why▾
Why this is wrong here
The billing model described is based on actual usage (hours, storage, data transfer) without upfront costs, which directly illustrates measured service, not rapid elasticity. Rapid elasticity refers to the ability to quickly scale resources up or down, not how usage is metered and billed.
★ When this WOULD be the correct answer
A question that asks: 'A company's web application experiences sudden spikes in traffic, and Azure automatically provisions additional virtual machines within minutes to handle the load, then deallocates them when traffic decreases. Which cloud characteristic does this demonstrate?'
Why candidates choose this
Candidates may confuse the variable nature of billing (pay-as-you-go) with the ability to scale rapidly, mistakenly thinking that elasticity implies usage-based billing.
✗Resource poolingWrong answer — click to see why▾
Why this is wrong here
Resource pooling refers to the provider's multi-tenant model where computing resources are shared across multiple customers, not to the billing based on actual usage. The question focuses on pay-per-use billing, not resource sharing.
★ When this WOULD be the correct answer
A question that asks: 'A cloud provider serves multiple customers from the same physical hardware, but customers cannot see each other's data. Which characteristic does this describe?' would have Resource pooling as the correct answer.
Why candidates choose this
Candidates may confuse resource pooling with metered usage because both involve shared infrastructure and variable costs, but resource pooling is about multi-tenancy, not billing granularity.
✗On-demand self-serviceWrong answer — click to see why▾
Why this is wrong here
On-demand self-service refers to the ability to provision resources without human interaction, not to the billing model based on actual usage. The question specifically asks about charges based on hours, storage, and data transfer, which is measured service.
★ When this WOULD be the correct answer
A company wants to provision a virtual machine through the Azure portal without contacting support or submitting a request. Which cloud characteristic does this describe?
Why candidates choose this
Candidates may confuse the ability to provision resources on-demand with the pay-per-use billing model, as both are related to user control and flexibility.
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?”
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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.