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 wants monthly billing based on the number of Microsoft 365 users assigned licenses. Which cloud characteristic does this represent?
Fault tolerance
Why wrong: Fault tolerance is the ability to continue operating during failure.
Resource pooling
Why wrong: Resource pooling means provider resources serve multiple customers.
Measured service
Measured service means usage can be metered, monitored, and billed based on consumption or assigned service usage.
Rapid elasticity
Why wrong: Rapid elasticity is scaling resources up or down quickly.
Answer choices
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 is a cloud characteristic where usage is metered and billed based on consumption. In this scenario, the company is billed monthly based on the number of Microsoft 365 users assigned licenses, which directly reflects metered usage of the service. This aligns with the pay-per-use model defined by NIST SP 800-145 for cloud computing.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
Fault tolerance
Why it's wrong here
Fault tolerance is the ability to continue operating during failure.
Resource pooling
Why it's wrong here
Resource pooling means provider resources serve multiple customers.
Measured service
Why this is correct
Measured service means usage can be metered, monitored, and billed based on consumption or assigned service usage.
Related concept
Read the scenario before looking for a memorised answer.
Rapid elasticity
Why it's wrong here
Rapid elasticity is scaling resources up or down quickly.
Common exam traps
The trap here is that candidates confuse 'measured service' with 'rapid elasticity' because both involve dynamic changes, but measured service is specifically about metering and billing, not about scaling resources.
Detailed technical explanation
Under the hood, Microsoft 365 uses a licensing API that tracks active user assignments per tenant, and the billing system aggregates this data monthly to generate invoices. The measured service model relies on metering agents that record consumption metrics (e.g., number of licensed users) and feed them into a billing engine. In a real-world scenario, if a company adds or removes licenses mid-month, the measured service model ensures the bill reflects only the days each license was active, not a flat monthly rate.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
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.
What to study next
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FAQ
Describe cloud concepts — This question tests Describe cloud concepts — Read the scenario before looking for a memorised answer..
The correct answer is: Measured service — Measured service is a cloud characteristic where usage is metered and billed based on consumption. In this scenario, the company is billed monthly based on the number of Microsoft 365 users assigned licenses, which directly reflects metered usage of the service. This aligns with the pay-per-use model defined by NIST SP 800-145 for cloud computing.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 11, 2026
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