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 bills them based on the exact amount of storage and compute hours they consume each month. They can increase or decrease their usage at any time without signing a long-term contract. Which cloud computing characteristic is most directly demonstrated by the billing model?
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 for exactly the amount of storage and compute hours consumed, with no long-term contract—directly demonstrates the measured service characteristic. Measured service means that cloud resource usage is metered, monitored, and reported, allowing providers to charge customers based on actual consumption (pay-as-you-go). This is a core attribute of cloud computing as defined by NIST SP 800-145, where usage is tracked and billed transparently.
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.
✗
Scalability
Why it's wrong here
Scalability refers to the ability to handle increased load, not directly to the pay-per-use billing.
✗
Elasticity
Why it's wrong here
Elasticity is automatic scaling, but the billing focus is on measured usage.
✓
Measured service
Why this is correct
Measured service enables pay-per-use billing by tracking resource consumption.
Related concept
Read the scenario before looking for a memorised answer.
✗
On-demand self-service
Why it's wrong here
This characteristic allows users to provision resources without manual intervention, but does not directly address billing.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse elasticity (the ability to scale dynamically) with measured service (the metering and billing of that usage), because both involve variable resource consumption, but measured service is specifically about the tracking and charging mechanism.
Detailed technical explanation
How to think about this question
Under the hood, measured service relies on resource metering agents (e.g., Azure Monitor, AWS CloudWatch) that track metrics like CPU hours, storage GB-months, and network I/O. These metrics are aggregated into usage records, which are then processed by a billing engine (e.g., Azure Cost Management) to generate invoices. A subtle behavior is that some services may round up partial usage (e.g., per-minute billing for VMs), but the core principle remains that the customer pays only for what they consume, not a flat fee.
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 for exactly the amount of storage and compute hours consumed, with no long-term contract—directly demonstrates the measured service characteristic. Measured service means that cloud resource usage is metered, monitored, and reported, allowing providers to charge customers based on actual consumption (pay-as-you-go). This is a core attribute of cloud computing as defined by NIST SP 800-145, where usage is tracked and billed transparently.
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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