MS-900 Describe cloud concepts Practice Question
Which characteristic of cloud computing allows a user to provision resources automatically without requiring human interaction with the service provider?
⚠ Common exam trap
Many candidates confuse 'rapid elasticity' with 'on-demand self-service' because both involve automation, but rapid elasticity focuses on scaling existing resources while on-demand self-service is about the initial provisioning without human intervention.
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
✓
On-demand self-service
On-demand self-service is a fundamental characteristic of cloud computing defined by NIST (SP 800-145) that allows a user to unilaterally provision computing capabilities, such as server time and network storage, as needed automatically without requiring human interaction with each service provider. This is typically implemented through a web portal or API (e.g., AWS Console, Azure Portal, or RESTful APIs) that enables instant resource creation and configuration.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Rapid elasticity
Why it's wrong here
Rapid elasticity is the characteristic that allows cloud resources to scale outward and inward quickly, often automatically, in response to fluctuating demand. While this supports dynamic workload changes, it does not describe the user-initiated, unilateral provisioning of resources without provider interaction. The question specifically asks about enabling a user to automatically obtain resources on demand, which is the domain of on-demand self-service, not the system's responsiveness in scaling.
- ✗
Resource pooling
Why it's wrong here
Resource pooling describes the provider's multi-tenant model in which computing resources are aggregated to serve multiple consumers, with physical and virtual resources dynamically assigned and reassigned according to demand. This characteristic is centered on the vendor's backend efficiency and cost sharing, not on the user's ability to provision services directly. It does not involve any mechanism by which an end user can automatically acquire resources without manual intervention; that capability belongs to on-demand self-service.
- ✓
On-demand self-service
Why this is correct
On-demand self-service is the NIST-defined characteristic that lets a consumer unilaterally provision computing capabilities—such as virtual machines, storage, or network services—as needed automatically, without requiring human interaction with the service provider. This is typically delivered through a web portal, CLI, or API, meaning the user can spin up resources in minutes without opening a support ticket. It directly matches the scenario in the question: the user can obtain resources automatically and without manual intervention.
- ✗
Measured service
Why it's wrong here
Measured service refers to the cloud provider's ability to meter and monitor resource usage, enabling pay-per-use billing, chargeback, and optimization through automatic control and reporting. It provides transparency into consumption for both provider and consumer, but it is fundamentally about metering and billing rather than the provisioning process. Therefore, while it is an essential cloud characteristic, it does not enable a user to automatically get resources as needed; that is the function of on-demand self-service.
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