AZ-900 Describe cloud concepts Practice Question
A company provides a software-as-a-service (SaaS) application to multiple enterprise customers. Each customer's usage of compute and storage resources is tracked separately. At the end of each month, the company generates detailed invoices that reflect each customer's exact resource consumption, including CPU hours, storage GB-months, and data transfer. The cloud provider automatically measures all resource usage and makes the data available through an API. Which essential characteristic of cloud computing does this scenario primarily demonstrate?
⚠ Common exam trap
Many exam-takers confuse 'measured service' with 'resource pooling' because both involve multi-tenant environments, but measured service specifically focuses on the metering and billing of usage per tenant, not the underlying shared infrastructure.
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 scenario describes a SaaS provider that tracks each customer's exact resource consumption (CPU hours, storage GB-months, data transfer) and generates invoices based on that metered usage. This aligns directly with the 'measured service' characteristic of cloud computing, where resource usage is automatically monitored, controlled, and reported, providing transparency for both the provider and consumer. The cloud provider's API making usage data available is a key enabler of this metering and billing capability.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
On-demand self-service
Why it's wrong here
On-demand self-service is the NIST cloud characteristic that lets a consumer unilaterally provision computing capabilities, such as server time or network storage, as needed automatically without requiring human interaction with each service provider. The scenario describes the SaaS provider tracking and invoicing per-customer usage, which is a metering and billing activity, not a consumer-triggered provisioning action. There is no indication that customers are spinning up or configuring resources themselves; rather, the focus is on the provider's automatic measurement of consumption, which aligns specifically with measured service, not on-demand self-service.
When this WOULD be correct
A question where a user can provision compute resources through a web portal without contacting the provider, and the scenario highlights the ability to do so at any time, would make on-demand self-service the correct answer.
- ✗
Broad network access
Why it's wrong here
Broad network access means resources are available over the network and accessed through standard protocols. While the SaaS app is accessed over the network, the scenario's focus is on metering and billing individual customer usage, not on network accessibility.
When this WOULD be correct
A question describing a scenario where users can access the SaaS application from various devices (laptops, smartphones, tablets) using standard internet connections, and the cloud provider ensures consistent access across different platforms. This would test understanding of broad network access.
- ✗
Resource pooling
Why it's wrong here
Resource pooling is the provider's ability to serve multiple customers from shared physical resources. While multi-tenancy is involved, the primary point of the scenario is the metering of usage per customer, not the pooling of resources.
When this WOULD be correct
A question describing a cloud provider that serves multiple customers from the same physical infrastructure, where resources are dynamically allocated and customers have no knowledge or control over the exact location of the resources, would make resource pooling the correct answer.
- ✓
Measured service
Why this is correct
Measured service is the cloud characteristic that enables usage tracking, control, and reporting. Cloud providers automatically measure resource consumption (CPU, storage, bandwidth) and expose that data for billing and optimization. The scenario directly illustrates this by describing per-customer usage tracking and invoice generation.
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 enables usage tracking, control, and reporting. Cloud providers automatically measure resource consumption (CPU, storage, bandwidth) and expose that data for billing and optimization. The scenario directly illustrates this by describing per-customer usage tracking and invoice generation.
✗On-demand self-serviceWrong answer — click to see why▾
Why this is wrong here
The scenario emphasizes automatic tracking and billing based on exact resource consumption, which is the definition of measured service. On-demand self-service refers to a user provisioning resources without human interaction, which is not the primary focus here.
★ When this WOULD be the correct answer
A question where a user can provision compute resources through a web portal without contacting the provider, and the scenario highlights the ability to do so at any time, would make on-demand self-service the correct answer.
Why candidates choose this
Candidates may confuse the ability to access and use resources automatically (via API) with on-demand self-service, but the key differentiator is that measured service focuses on metering and billing, not just provisioning.
✗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, mobile devices). The scenario focuses on metering and billing per customer usage, not on network accessibility.
★ When this WOULD be the correct answer
A question describing a scenario where users can access the SaaS application from various devices (laptops, smartphones, tablets) using standard internet connections, and the cloud provider ensures consistent access across different platforms. This would test understanding of broad network access.
Why candidates choose this
Candidates may confuse the API-based data retrieval with network access, thinking that the API implies broad network access, but the core characteristic demonstrated is measured service (metering and billing).
✗Resource poolingWrong answer — click to see why▾
Why this is wrong here
Resource pooling refers to the provider's computing resources being pooled to serve multiple consumers, with physical and virtual resources dynamically assigned and reassigned. The scenario focuses on tracking and billing individual usage, which is measured service, not pooling.
★ When this WOULD be the correct answer
A question describing a cloud provider that serves multiple customers from the same physical infrastructure, where resources are dynamically allocated and customers have no knowledge or control over the exact location of the resources, would make resource pooling the correct answer.
Why candidates choose this
Candidates may confuse the multi-tenant aspect of the scenario (multiple customers) with resource pooling, but the key detail is the tracking and billing of individual usage, which points to measured service.
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?”
Go deeper
Related to this question
Learn chapter
What is Cloud Computing?
Key term
Cloud computing
Cloud computing is the on-demand delivery of IT resources over the internet, allowing users to access computing power, storage, and applications without owning physical hardware.
Key term
SaaS
Software as a Service (SaaS) is a cloud computing model where you use software over the internet without installing it on your own computer.
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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.