- A
On-demand self-service
Why wrong: On-demand self-service allows users to provision resources without human interaction, but the billing aspect is not its primary focus. The scenario emphasizes metered billing.
- B
Rapid elasticity
Why wrong: Rapid elasticity refers to the ability to quickly scale resources up and down. While the scenario mentions changing usage, the core characteristic highlighted is the billing based on consumption.
- C
Measured service
Measured service is the characteristic where cloud resource usage is metered, and customers are billed accordingly. The pay-per-use model is a key expression of measured service.
- D
Resource pooling
Why wrong: Resource pooling describes the provider serving multiple customers from shared physical resources. The billing model is not directly related to pooling.
MS-900 Describe cloud concepts Practice Question
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 and is billed monthly based only on the exact amount of storage used and the number of compute hours consumed. They can increase or decrease usage at any time without upfront commitments. Which cloud computing characteristic does this billing model primarily demonstrate?
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
The billing model charges only for actual storage used and compute hours consumed, with no upfront commitments and the ability to adjust usage at any time. This directly aligns with the 'measured service' characteristic, where cloud resource usage is metered, monitored, and billed based on consumption. The key is that the provider tracks and reports usage transparently, enabling a pay-per-use model.
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.
- ✗
On-demand self-service
Why it's wrong here
On-demand self-service allows users to provision resources without human interaction, but the billing aspect is not its primary focus. The scenario emphasizes metered billing.
- ✗
Rapid elasticity
Why it's wrong here
Rapid elasticity refers to the ability to quickly scale resources up and down. While the scenario mentions changing usage, the core characteristic highlighted is the billing based on consumption.
- ✓
Measured service
Why this is correct
Measured service is the characteristic where cloud resource usage is metered, and customers are billed accordingly. The pay-per-use model is a key expression of measured service.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Resource pooling
Why it's wrong here
Resource pooling describes the provider serving multiple customers from shared physical resources. The billing model is not directly related to pooling.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse 'measured service' with 'rapid elasticity' because both involve scaling, but measured service is specifically about metering and billing, not the speed of scaling.
Trap categories for this question
Scenario analysis trap
On-demand self-service allows users to provision resources without human interaction, but the billing aspect is not its primary focus. The scenario emphasizes metered billing.
Detailed technical explanation
How to think about this question
Measured service is typically implemented via metering agents that track metrics like CPU hours, GB-months of storage, and network I/O, often using protocols such as SNMP or REST APIs to feed data into a billing system. For example, AWS CloudWatch collects usage metrics and sends them to the billing dashboard, where charges are calculated per resource-hour. This characteristic is foundational to the 'pay-as-you-go' model and is defined in NIST SP 800-145 as one of the five essential cloud characteristics.
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.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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FAQ
Questions learners often ask
What does this MS-900 question test?
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 only for actual storage used and compute hours consumed, with no upfront commitments and the ability to adjust usage at any time. This directly aligns with the 'measured service' characteristic, where cloud resource usage is metered, monitored, and billed based on consumption. The key is that the provider tracks and reports usage transparently, enabling a pay-per-use model.
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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Last reviewed: Jun 11, 2026
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