AZ-900 Describe cloud concepts Practice Question
A cloud provider offers resources on-demand and measures usage. Customers pay only for what they consume. Which characteristic of cloud computing is this?
⚠ Common exam trap
Watch out — candidates often confuse 'measured service' with 'resource pooling' because both involve shared infrastructure, but measured service specifically focuses on usage tracking and billing, not the underlying multi-tenant architecture.
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
This describes the 'measured service' characteristic, where cloud providers meter resource usage (e.g., compute hours, storage GB, network I/O) and bill customers based on actual consumption. This pay-per-use model is enabled by telemetry and monitoring systems that track metrics like CPU time, bandwidth, and API calls, allowing granular cost allocation.
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 this is correct
Measured service is the cloud characteristic that meters resource usage—such as compute hours, storage gigabytes, or network throughput—and bills customers based on that consumption. This telemetry also supports cost transparency, chargeback/showback models, and capacity planning. Without metering, pay-as-you-go pricing would be impossible, so measuring usage is precisely what distinguishes cloud utility pricing from fixed-cost IT procurement.
- ✗
Resource pooling
Why it's wrong here
Resource pooling describes how a provider's physical and virtual infrastructure is shared among multiple tenants while keeping logical isolation. It explains multi-tenancy and virtualization, but it does not involve tracking consumption for billing. Even if resources are pooled, a provider could charge a flat fee, so pooling by itself has no direct relationship to per-use metering.
When this WOULD be correct
A question that asks: 'Which cloud characteristic allows multiple customers to share the same physical infrastructure while maintaining isolation and security?' would have resource pooling as the correct answer.
- ✗
Broad network access
Why it's wrong here
Broad network access means that cloud capabilities are available over standard network protocols (HTTPS, etc.) and can be reached from desktops, laptops, phones, and other devices. This characteristic addresses ubiquitous connectivity, not the measurement of usage. Accessibility over a network tells you nothing about how usage is counted or billed, so it is a distinct trait from measured service.
When this WOULD be correct
A question that asks: 'Which cloud characteristic allows resources to be accessed from various devices (e.g., laptops, smartphones) over the network?' would have broad network access as the correct answer.
- ✗
Rapid elasticity
Why it's wrong here
Rapid elasticity is the ability to scale resources outward or inward automatically in response to demand. It ensures that users perceive unlimited provisioning and can release resources just as quickly. Elasticity is about adapting capacity in real time, not about metering or tariffing the resources consumed; a system can be elastic and still use a fixed-price license, so it is not the correct term for usage tracking and billing.
When this WOULD be correct
A question that asks: 'A company experiences sudden spikes in traffic and needs to automatically add virtual machines within minutes. Which cloud characteristic describes this ability?' would make rapid elasticity the correct answer.
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
Measured service is the cloud characteristic that meters resource usage—such as compute hours, storage gigabytes, or network throughput—and bills customers based on that consumption. This telemetry also supports cost transparency, chargeback/showback models, and capacity planning. Without metering, pay-as-you-go pricing would be impossible, so measuring usage is precisely what distinguishes cloud utility pricing from fixed-cost IT procurement.
✗Resource poolingWrong answer — click to see why▾
Why this is wrong here
Resource pooling refers to serving multiple customers from shared physical resources, not to the pay-per-use billing model. The question specifically describes metering and consumption-based pricing, which is measured service.
★ When this WOULD be the correct answer
A question that asks: 'Which cloud characteristic allows multiple customers to share the same physical infrastructure while maintaining isolation and security?' would have resource pooling as the correct answer.
Why candidates choose this
Candidates may confuse resource pooling with measured service because both involve shared infrastructure and usage tracking, but resource pooling is about multi-tenancy, not billing.
✗Broad network accessWrong answer — click to see why▾
Why this is wrong here
Broad network access refers to the ability to access cloud services over the network via standard protocols (e.g., internet), not to the pay-per-use or metered usage model described in the question.
★ When this WOULD be the correct answer
A question that asks: 'Which cloud characteristic allows resources to be accessed from various devices (e.g., laptops, smartphones) over the network?' would have broad network access as the correct answer.
Why candidates choose this
Candidates may confuse the broad accessibility of cloud services (network access) with the idea that services are available on-demand and measured, because both involve the concept of 'access' and 'usage'.
✗Rapid elasticityWrong answer — click to see why▾
Why this is wrong here
Rapid elasticity refers to the ability to quickly scale resources up or down, not to the pay-per-use billing model. The question specifically describes metering usage and paying only for consumption, which is measured service.
★ When this WOULD be the correct answer
A question that asks: 'A company experiences sudden spikes in traffic and needs to automatically add virtual machines within minutes. Which cloud characteristic describes this ability?' would make rapid elasticity the correct answer.
Why candidates choose this
Candidates may confuse rapid scaling with pay-as-you-go because both involve dynamic resource adjustment, but they focus on different aspects: scaling vs. billing.
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.