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 company uses a cloud provider that charges them based solely on the exact number of gigabytes of storage used and the number of virtual machine hours consumed. They can increase or decrease usage at any time without any upfront commitment. Which essential characteristic of cloud computing 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 of cloud computing. Measured service means cloud providers meter and bill customers precisely for the resources they consume, often using a pay-as-you-go model. This allows the company to pay only for what they use without upfront commitments, as described in the scenario.
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 means cloud resources are metered and billed based on consumption, like storage and compute hours.
Related concept
Read the scenario before looking for a memorised answer.
✗
Rapid elasticity
Why it's wrong here
Rapid elasticity refers to the ability to quickly scale resources, but not specifically to billing based on consumption.
✗
Resource pooling
Why it's wrong here
Resource pooling is the provider serving multiple customers from shared physical resources, not a billing model.
✗
On-demand self-service
Why it's wrong here
On-demand self-service allows users to provision resources automatically, but it does not describe the billing aspect.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse 'measured service' with 'on-demand self-service' because both involve user control and flexibility, but measured service specifically focuses on the metering and billing aspect, not the ability to provision resources without human interaction.
Detailed technical explanation
How to think about this question
Measured service is typically implemented through metering capabilities that track usage metrics such as CPU hours, bandwidth consumption, and storage I/O operations, often using APIs like AWS CloudWatch or Azure Monitor to collect telemetry. This characteristic is defined in the NIST SP 800-145 standard, which states that cloud systems automatically control and optimize resource use by leveraging a metering capability at some level of abstraction appropriate to the type of service. In real-world scenarios, measured service enables providers to offer granular billing tiers, such as per-second billing for virtual machines in Google Cloud or per-hour billing in Azure, which can significantly impact cost optimization strategies for enterprises.
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 of cloud computing. Measured service means cloud providers meter and bill customers precisely for the resources they consume, often using a pay-as-you-go model. This allows the company to pay only for what they use without upfront commitments, as described in the scenario.
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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