This MS-900 practice question tests your understanding of describe cloud concepts. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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 company uses a cloud provider that charges them only for the actual storage and compute resources they consume each month. They can start or stop machines at any time and are billed precisely for what they use. Which 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 described—paying only for actual storage and compute resources consumed, with the ability to start/stop machines at any time—directly demonstrates 'Measured service'. This characteristic, defined by NIST SP 800-145, means cloud systems automatically control and optimize resource usage by leveraging a metering capability at some level of abstraction appropriate to the type of service (e.g., storage, processing, bandwidth, active user accounts). Usage is monitored, controlled, and reported, providing transparency for both the provider and consumer.
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.
✗
Rapid elasticity
Why it's wrong here
Rapid elasticity is about scaling resources up or down quickly, not about billing based on consumption.
✗
On-demand self-service
Why it's wrong here
On-demand self-service refers to provisioning without human interaction, not the billing aspect.
✗
Resource pooling
Why it's wrong here
Resource pooling is the multi-tenant model where physical resources are shared; it does not describe billing.
✓
Measured service
Why this is correct
Measured service means usage is metered, enabling pay-per-use billing. This scenario directly illustrates that characteristic.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse 'Measured service' with 'On-demand self-service' because both involve user control, but measured service specifically addresses the metering and pay-per-use billing aspect, not the ability to provision without human interaction.
Detailed technical explanation
How to think about this question
Under the hood, measured service relies on metering telemetry agents (e.g., Azure Monitor, AWS CloudWatch) that track resource consumption at the hypervisor or API level, often using counters for CPU hours, GB-months of storage, and network I/O. These metrics are aggregated into billing records via usage APIs (e.g., Azure RateCard API, AWS Cost and Usage Reports). A subtle behavior: even stopped virtual machines may incur charges for allocated storage (e.g., managed disks) or reserved IP addresses, so 'precisely for what they use' typically excludes idle allocated resources unless deallocated.
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 described—paying only for actual storage and compute resources consumed, with the ability to start/stop machines at any time—directly demonstrates 'Measured service'. This characteristic, defined by NIST SP 800-145, means cloud systems automatically control and optimize resource usage by leveraging a metering capability at some level of abstraction appropriate to the type of service (e.g., storage, processing, bandwidth, active user accounts). Usage is monitored, controlled, and reported, providing transparency for both the provider and consumer.
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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