MS-900 Describe cloud concepts Practice Question
A company uses a cloud storage service that automatically increases its storage capacity without any manual intervention as new files are added. This behavior is an example of which cloud computing characteristic?
⚠ Common exam trap
It's easy for candidates to confuse 'resource pooling' (the multi-tenant sharing of resources) with 'rapid elasticity' (the ability to scale resources up/down automatically), because both involve dynamic allocation, but pooling is about sharing among tenants while elasticity is about scaling for a single tenant's demand.
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
✓
Rapid elasticity
The scenario describes storage capacity automatically increasing as new files are added, which is the essence of rapid elasticity. This cloud characteristic allows resources to scale out and in automatically, often to the point where the user perceives unlimited capacity, without requiring manual provisioning or intervention.
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 lets users provision computing capabilities automatically without requiring manual provider intervention, but it applies to the initial setup and configuration of resources, such as creating a storage account or ordering compute instances. It does not address what happens after deployment, so the automatic scaling of storage capacity described in the scenario is outside the scope of this characteristic. Because the key behavior is continuous, dynamic scaling rather than initial self-provisioning, this option is incorrect.
- ✗
Broad network access
Why it's wrong here
Broad network access means cloud services are available over the network through standard protocols and can be consumed by various client devices such as laptops, phones, and workstations. A cloud storage service is certainly accessible via HTTPS endpoints, and that connectivity is a prerequisite for any use, but this characteristic explains how users reach the service, not how the service adjusts its capacity. The scenario focuses on automatic scaling of storage, which has nothing to do with network reachability, so this option is incorrect.
- ✗
Resource pooling
Why it's wrong here
Resource pooling describes the multi-tenant model in which the provider's computing resources are pooled to serve multiple customers, with physical and virtual resources dynamically assigned and reassigned according to customer demand. That explains the shared infrastructure and provider-side allocation of resources, but it does not describe a customer-visible, automated scaling behavior for a storage service. The scenario's key is the service automatically scaling its capacity, which is a different characteristic, making resource pooling the wrong choice.
- ✓
Rapid elasticity
Why this is correct
Rapid elasticity is the NIST essential characteristic that allows a cloud service to provision and release resources automatically, scaling out and in quickly and in line with real-time demand. A storage service that automatically increases or decreases its capacity based on usage is a textbook example of this behavior, because the customer perceives the scaling as seamless and often without pre-planning. This precisely matches the scenario, so it is the correct answer.
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Related to this question
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Cloud Service Types for MS-900
Key term
Cloud storage
Cloud storage is a service that lets you save data on remote servers accessed over the internet instead of on your computer's hard drive.
Key term
User
A user is any person, system, or device that interacts with an IT service, resource, or identity system, typically authenticated through credentials and authorized to perform specific actions.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This MS-900 practice question is part of Courseiva's free Microsoft certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the MS-900 exam.