This MS-900 practice question tests your understanding of describe cloud concepts. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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 cloud provider bills a customer monthly based on the precise number of gigabytes of storage used and the number of virtual machine hours consumed. Which essential cloud computing characteristic does this billing model demonstrate?
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 charges based on exact gigabytes of storage used and virtual machine hours consumed, which directly aligns with the 'measured service' characteristic. This means the cloud provider meters resource usage (e.g., storage IOPS, compute hours) and bills only for what is consumed, enabling pay-as-you-go pricing. Measured service relies on telemetry and monitoring systems (e.g., Azure Monitor, AWS CloudWatch) to track usage and generate invoices.
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.
✓
Measured service
Why this is correct
Measured service enables metering of resource usage and pay-as-you-go billing, as described in the scenario.
Related concept
Read the scenario before looking for a memorised answer.
✗
Resource pooling
Why it's wrong here
Resource pooling means the provider's resources are shared among multiple customers, not directly related to billing granularity.
✗
On-demand self-service
Why it's wrong here
On-demand self-service allows users to provision resources automatically, but the billing model itself is not the focus.
✗
Broad network access
Why it's wrong here
Broad network access is about network accessibility, not metering or billing.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Microsoft often tests the distinction between 'measured service' (billing granularity) and 'on-demand self-service' (provisioning capability), leading candidates to confuse the ability to spin up resources instantly with how those resources are billed.
Detailed technical explanation
How to think about this question
Under the hood, measured service in Azure uses the Azure Resource Manager (ARM) to track resource consumption at a granular level, such as per-second billing for virtual machines (e.g., Standard_D2s_v3) and per-GB-month for Azure Blob Storage. This metering data is aggregated into usage records, which are then processed by the billing system to generate invoices. A subtle behavior is that reserved instances or savings plans can alter the effective rate, but the measured usage still drives the base charge.
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.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this MS-900 question in full detail.
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 billing model charges based on exact gigabytes of storage used and virtual machine hours consumed, which directly aligns with the 'measured service' characteristic. This means the cloud provider meters resource usage (e.g., storage IOPS, compute hours) and bills only for what is consumed, enabling pay-as-you-go pricing. Measured service relies on telemetry and monitoring systems (e.g., Azure Monitor, AWS CloudWatch) to track usage and generate invoices.
What should I do if I get this MS-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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Question Discussion
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