MS-900 Describe cloud concepts Practice Question
A marketing manager needs to provision a new virtual machine to run a temporary campaign analysis. They log into the cloud provider's web portal, select a VM size, configure settings, and start the VM within minutes—all without any human interaction with the provider's IT staff. Which essential characteristic of cloud computing does this scenario best illustrate?
⚠ Common exam trap
Many candidates confuse 'rapid elasticity' with the speed of initial provisioning, but rapid elasticity specifically refers to the ability to automatically scale resources up or down in response to workload changes, not the one-time act of creating a resource without human help.
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 a virtual machine independently through a web portal without any human interaction with the provider's IT staff. This directly maps to the NIST-defined essential characteristic 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.
- ✗
Resource pooling
Why it's wrong here
Resource pooling describes the cloud provider serving multiple tenants from shared physical and virtual infrastructure, such as compute and storage pools. This is a provider-side architecture that enables economies of scale and multi-tenancy, but it does not explain the marketing manager's ability to independently create a virtual machine through a portal. The action described is user-initiated provisioning, not the underlying resource-sharing model, so resource pooling is not the correct characteristic.
- ✗
Rapid elasticity
Why it's wrong here
Rapid elasticity is the cloud characteristic that allows resources to scale out or in automatically in response to workload demand, such as an autoscaling Azure Virtual Machine Scale Set that adds instances during peak traffic. This is a dynamic, ongoing capability driven by metrics or thresholds, whereas the marketing manager is performing a one-time, manual VM provisioning action. Since there is no mention of automatic scaling or fluctuating demand, rapid elasticity does not match the scenario.
- ✓
On-demand self-service
Why this is correct
On-demand self-service is the NIST cloud characteristic where a user can provision compute capabilities, such as virtual machines, without requiring human interaction with the service provider. The marketing manager uses a web portal or API to create a VM for the project, receiving the resource immediately and independently. This exactly matches the described scenario: the user initiates and completes the provisioning themselves, making on-demand self-service the correct answer.
- ✗
Measured service
Why it's wrong here
Measured service refers to the cloud provider automatically monitoring, metering, and billing resources based on usage, such as charging per compute hour or per gigabyte of storage. This characteristic relates to usage transparency and pay-as-you-go cost models, not to the process of provisioning a virtual machine. While a provisioned VM will eventually be metered, the act of creating it is not what measured service describes, so this option is incorrect for the scenario.
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