AZ-900 Describe cloud concepts Practice Question
A company uses Azure to host a web application. At the end of each month, the finance team receives an invoice that details charges for compute hours, storage consumption, and outbound data transfer. The IT manager explains that this granular billing is possible because Azure continuously monitors resource usage and provides detailed usage data for cost allocation. This capability is a direct example of which essential characteristic of cloud computing as defined by the National Institute of Standards and Technology (NIST)?
⚠ Common exam trap
Watch out — candidates often confuse 'resource pooling' (Option C) with the idea of shared resources being billed, but the key distinction is that measured service specifically addresses the metering and reporting of usage for billing and optimization, not the multi-tenant sharing aspect.
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
Measured service, because the scenario describes Azure's ability to continuously monitor resource usage (compute hours, storage, data transfer) and provide detailed billing data. This aligns with NIST's definition of measured service, where cloud systems automatically control and optimize resource use by leveraging a metering capability at some level of abstraction appropriate to the type of service (e.g., storage, processing, bandwidth, and active user accounts). The granular invoice is a direct output of this metering and reporting feature.
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 allows a consumer to provision computing capabilities automatically without requiring human interaction with the service provider. While Azure does offer self-service provisioning, the scenario focuses on post-usage metering and billing, not the initial provisioning process.
When this WOULD be correct
A question that asks: 'A developer can provision a virtual machine through a web portal without contacting IT support. Which NIST characteristic does this represent?' Then 'On-demand self-service' would be correct.
- ✗
Broad network access
Why it's wrong here
Broad network access means Azure services are reachable over standard internet protocols from diverse devices, such as laptops, phones, and tablets. The scenario, however, centers on the automatic monitoring and metering of resource consumption for billing at the end of the month. Even though a web app is network-accessible, the described process of usage tracking is not about network availability but about measuring and charging for usage.
When this WOULD be correct
A question asks: 'A company deploys a web application on Azure that can be accessed from anywhere using a smartphone, laptop, or tablet. Which NIST essential characteristic does this demonstrate?' Broad network access would be correct because it describes capabilities available over the network and accessed by heterogeneous client platforms.
- ✗
Resource pooling
Why it's wrong here
Resource pooling describes how Azure aggregates physical infrastructure to serve multiple customers with virtualization and isolation, but this multi-tenant sharing model is not the focus of the scenario. The scenario highlights usage-based metering and billing, which is the measured service characteristic. Metering can apply even when resources are dedicated, so the explanation of the scenario does not rely on pooling.
When this WOULD be correct
A question that asks: 'A cloud provider hosts multiple customers on the same physical server, automatically allocating resources based on demand. This is an example of which NIST essential characteristic?' would have resource pooling as the correct answer.
- ✓
Measured service
Why this is correct
Measured service is the correct characteristic. Cloud systems automatically control and optimize resource use by leveraging a metering capability. This allows providers to track usage (compute hours, storage, bandwidth) and bill consumers accordingly, as described in the scenario.
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 correct characteristic. Cloud systems automatically control and optimize resource use by leveraging a metering capability. This allows providers to track usage (compute hours, storage, bandwidth) and bill consumers accordingly, as described in the scenario.
✗On-demand self-serviceWrong answer — click to see why▾
Why this is wrong here
The question describes granular billing based on monitored usage, which directly aligns with 'measured service' (metering and charging for usage). 'On-demand self-service' refers to a user provisioning resources without human interaction, not to billing or usage monitoring.
★ When this WOULD be the correct answer
A question that asks: 'A developer can provision a virtual machine through a web portal without contacting IT support. Which NIST characteristic does this represent?' Then 'On-demand self-service' would be correct.
Why candidates choose this
Candidates may confuse the ability to see and manage usage details (billing) with the ability to self-provision resources, as both involve user interaction with the cloud provider's systems.
✗Broad network accessWrong answer — click to see why▾
Why this is wrong here
Broad network access refers to the ability to access cloud resources over the network via standard protocols, not to the monitoring and reporting of resource usage for billing. The question specifically describes detailed usage tracking and invoicing, which is the essence of measured service.
★ When this WOULD be the correct answer
A question asks: 'A company deploys a web application on Azure that can be accessed from anywhere using a smartphone, laptop, or tablet. Which NIST essential characteristic does this demonstrate?' Broad network access would be correct because it describes capabilities available over the network and accessed by heterogeneous client platforms.
Why candidates choose this
Candidates may confuse the idea of 'accessing billing data over a network' with broad network access, or they might think that the ability to view invoices online implies network access, but the core of the question is about usage measurement, not network accessibility.
✗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 question describes detailed usage monitoring and billing, which exemplifies measured service, not resource pooling.
★ When this WOULD be the correct answer
A question that asks: 'A cloud provider hosts multiple customers on the same physical server, automatically allocating resources based on demand. This is an example of which NIST essential characteristic?' would have resource pooling as the correct answer.
Why candidates choose this
Candidates may confuse resource pooling with measured service because both involve multi-tenancy and resource management, but measured service specifically relates to metering and billing, while pooling is about shared infrastructure.
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?”
Visual reference
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Related to this question
Learn chapter
What is Cloud Computing?
Key term
Feature
A feature is a distinct unit of functionality that delivers value to the user, often managed and tracked throughout the software development lifecycle.
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.
About these practice questions
Courseiva writes every AZ-900 question from scratch — 981 in total, each with an explanation and a wrong-answer breakdown. None are copied from real exams or dumps. Learn why practice questions differ from exam dumps →
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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.