MS-900 Describe cloud concepts Practice Question
Which cloud computing characteristic allows users to be billed only for the resources they consume, such as processing power, storage, or bandwidth?
⚠ Common exam trap
Many candidates confuse 'measured service' with 'resource pooling' because both involve dynamic allocation, but measured service specifically refers to the metering and billing aspect, not the multi-tenant sharing of 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 the cloud computing characteristic that enables usage-based billing by monitoring, controlling, and reporting resource consumption (e.g., CPU hours, GB of storage, or data transfer) at a granular level. This metering capability allows providers to charge customers only for what they actually use, rather than a flat fee, and is typically implemented via telemetry and billing APIs.
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 is the NIST characteristic that allows a consumer to unilaterally provision computing capabilities, such as server time and network storage, without requiring human interaction with each service provider. It revolves around the capability to request and configure resources automatically via a web portal or API, but this provisioning action itself does not measure or quantify resource consumption for chargeback. Usage-based billing depends on a separate metering and reporting mechanism, which is not described by the self-service attribute.
- ✗
Broad network access
Why it's wrong here
Broad network access describes the ability to access cloud services over the network using standard protocols from heterogeneous client platforms, including mobile phones, laptops, and workstations. This characteristic ensures ubiquitous connectivity and low-latency reachability, but it does not inherently involve tracking or metering usage in a way that would produce a monetary bill. Billing requires a measurement of consumed resources, which is a distinct architectural component unrelated to network accessibility.
- ✓
Measured service
Why this is correct
Measured service is the cloud characteristic that automatically controls and optimizes resource use by leveraging a metering capability at some level of abstraction appropriate to the service type. Usage data for storage, processing, bandwidth, or active user accounts is collected, monitored, and reported, giving transparency for both the provider and the consumer. Because this metering generates a quantifiable usage baseline, it directly enables pay-as-you-go billing, where customers are charged based on actual consumption rather than flat-rate licenses.
- ✗
Resource pooling
Why it's wrong here
Resource pooling refers to the provider's computing resources being aggregated to serve multiple consumers through a multi-tenant model, with virtual and physical resources dynamically assigned and reassigned based on demand. This sharing of infrastructure creates economies of scale, but it does not automatically generate per-tenant usage records; a separate metering system must track each tenant's individual consumption. As a result, resource pooling can lower unit costs, but billing for realized usage is not an inherent property of the pooling characteristic itself.
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