MS-900 Describe cloud concepts Practice Question
A cloud provider allows customers to provision virtual machines, storage, and other resources through a web portal without requiring human interaction with the provider's staff. Which cloud computing characteristic does this best illustrate?
⚠ Common exam trap
Test-takers frequently confuse the 'self-service' aspect of provisioning with 'rapid elasticity' because both involve speed, but the question specifically highlights the lack of human interaction, which is the defining feature of on-demand self-service, not the scaling behavior.
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
The scenario describes a user provisioning resources through a web portal without any human interaction from the provider. This directly matches the NIST SP 800-145 definition of on-demand self-service, where a consumer can unilaterally provision computing capabilities as needed automatically without requiring human interaction with each service provider.
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 refers to the ability of a cloud system to automatically expand and release computing resources—such as VM instances, storage, or bandwidth—to scale outward and inward in response to fluctuating demand. Although elasticity often involves automatic scaling without human mediation, it specifically describes the post-provisioning scaling behavior and the perception of unlimited resource availability, not the consumer's initial unilateral request. In the scenario where a customer provisions a VM from a web portal, the defining trait is the self-service request action, not the subsequent scaling capability.
- ✗
Measured service
Why it's wrong here
Measured service means that cloud providers automatically meter and abstract resource usage—for example, CPU cycles, RAM, network I/O, and storage—to optimize and report on utilization, typically enabling a pay-per-use billing model. This characteristic provides transparent cost accounting and resource governance, but it operates after (or alongside) resource provisioning and does not explain how the customer gains the ability to create a VM without contacting a provider agent. The question centers on the act of provisioning itself, whereas measured service focuses on metering consumed capacity.
- ✗
Resource pooling
Why it's wrong here
Resource pooling is the multi-tenant architectural model in which the provider's physical and virtual resources are aggregated into a shared pool and dynamically assigned to consumers based on demand, so customers do not know or control the exact physical location of their VMs. It underpins the economic efficiency of cloud computing by allowing many customers to share the same hardware, but it is a background infrastructure characteristic rather than the consumer-facing provisioning capability. The described behavior of a customer unilaterally provisioning a VM is a direct interaction, not the shared-resource architecture.
- ✓
On-demand self-service
Why this is correct
On-demand self-service is the cloud characteristic that lets a consumer unilaterally provision computing capabilities—such as virtual machines, storage, and databases—automatically, using a self-service interface like a web portal, CLI, or REST API, with no human interaction with the cloud provider. In the question's scenario, the customer directly requests and configures a VM and receives it without waiting for an administrator, which is precisely the definition of this capability. It is a foundational trait that distinguishes cloud computing from traditional IT operations, where provisioning requires a service desk ticket and human approval.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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