MS-900 Describe cloud concepts Practice Question
A company wants monthly billing based on the number of Microsoft 365 users assigned licenses. Which cloud characteristic does this represent?
⚠ Common exam trap
Candidates often confuse 'measured service' with 'rapid elasticity' because both involve dynamic changes, but measured service is specifically about metering and billing, not about scaling resources.
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
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.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
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Fault tolerance
Why it's wrong here
Fault tolerance is a resilience characteristic that uses redundant components, failover mechanisms, and automatic recovery so a service can continue operating even when a component fails. While it is essential for maintaining availability and meeting SLAs, it does not address how consumption is measured or how invoices are calculated. Therefore, it is incorrect here because the requirement is about usage-based billing, not about surviving hardware or software failures.
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Resource pooling
Why it's wrong here
Resource pooling describes the multi-tenant nature of cloud providers, where compute, storage, and network resources are shared across many customers and dynamically assigned according to demand. This characteristic enables cost efficiency and allows providers to serve diverse workloads, but the billing mechanism itself relies on metering individual usage, which is the separate measured service characteristic. Thus, resource pooling alone does not explain how a company would be billed monthly based on the number of Microsoft services consumed.
- ✓
Measured service
Why this is correct
Measured service is the cloud characteristic that provides usage metering, monitoring, and billing, allowing providers to charge for exactly the amount of service consumed or assigned—such as per-user Microsoft 365 licenses or per-hour virtual machine usage in Azure. It leverages telemetry and metering systems to track resource consumption, making it the direct answer to a requirement for monthly billing based on the number of Microsoft services. This is the only option that explicitly connects usage to financial invoicing, so it is correct.
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Rapid elasticity
Why it's wrong here
Rapid elasticity is a scalability feature that lets cloud resources be provisioned and released automatically to match fluctuating demand, sometimes within minutes. While this dynamic scaling can influence the total amount of consumption that gets billed, the actual charging model is defined by measured service, which meters the resources that were used. Since the need here is for a billing mechanism rather than an operational scaling capability, rapid elasticity is not the right answer.
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