MS-900 Describe cloud concepts Practice Question
A cloud provider serves thousands of customers using the same physical hardware. Each customer's data and applications are isolated from one another through virtualization. The provider can dynamically allocate resources to customers based on demand. Which cloud characteristic does this describe?
⚠ Common exam trap
Watch out — candidates often confuse 'resource pooling' with 'rapid elasticity' because both involve dynamic allocation, but resource pooling is about the multi-tenant sharing of physical infrastructure, while elasticity is about the speed and automation of scaling resources up or down.
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
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Resource pooling
This scenario describes resource pooling, where the cloud provider's computing resources (e.g., storage, processing, memory, network bandwidth) are pooled to serve multiple customers using a multi-tenant model. Virtualization isolates each customer's data and applications, while physical and virtual resources are dynamically assigned and reassigned according to consumer demand. This is a core characteristic of cloud computing as defined by NIST SP 800-145.
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 this is correct
Resource pooling is the NIST cloud characteristic that directly describes the provider serving thousands of customers using the same physical infrastructure. In this multi-tenant model, the provider's computing, storage, network, and other resources are pooled and dynamically assigned and reassigned to consumers based on demand, with each tenant unaware of or lacking control over the exact underlying hardware location. This is precisely the scenario in the question, making it the correct answer.
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On-demand self-service
Why it's wrong here
On-demand self-service refers to a consumer's ability to unilaterally provision cloud capabilities, such as server time or network storage, automatically without requiring manual interaction with the service provider. It addresses how customers obtain and configure resources, not how the provider physically shares or pools those resources across multiple tenants. While related to the cloud model, it does not explain the infrastructure sharing posed in the question.
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Rapid elasticity
Why it's wrong here
Rapid elasticity is about scaling, not sharing: it allows cloud capabilities to be elastically provisioned and released, in some cases automatically, to scale rapidly outward and inward in response to demand. From the consumer's perspective, available capabilities often appear unlimited and can be purchased in any quantity at any time. This characteristic describes dynamic resource adjustment, not the act of serving thousands of customers from the same physical hardware.
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Measured service
Why it's wrong here
Measured service is the cloud characteristic that automates metering and optimization of resource usage by leveraging a metering capability at some level of abstraction appropriate to the type of service (e.g., storage, processing, bandwidth, or active user accounts). It underpins pay-per-use billing and provides transparency for both provider and consumer, but it has nothing to do with the physical aggregation of infrastructure. Therefore, it is incorrect for this question.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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