AZ-900 Describe cloud concepts Practice Question
A company runs multiple virtual machines (VMs) in Azure. The IT team notices that their VMs are hosted on physical hardware that is shared among multiple customers. The team has no ability to specify or control which physical server their VMs run on, and they cannot see the underlying hardware details. The VMs are, however, always available when requested. This scenario exemplifies which essential characteristic of cloud computing as defined by the National Institute of Standards and Technology (NIST)?
⚠ Common exam trap
Candidates often confuse 'resource pooling' with 'on-demand self-service' because both involve automation and abstraction, but the key differentiator is the multi-tenant hardware sharing and lack of customer control over the physical server, which is unique to resource pooling.
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
✓
Resource pooling
Resource pooling is the correct answer because the scenario describes the cloud provider's ability to serve multiple customers from the same physical hardware, with the customer having no control or knowledge of the exact underlying server. This is a core NIST characteristic where computing resources (including storage, processing, memory, and network bandwidth) are pooled to serve multiple consumers using a multi-tenant model, with physical and virtual resources dynamically assigned and reassigned according to consumer demand. The fact that VMs are always available when requested further aligns with the elasticity and on-demand nature of resource pooling, but the key is the shared, abstracted infrastructure.
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 refers to a user's ability to provision computing resources as needed without requiring human interaction with the service provider. The scenario does not describe the provisioning process; it describes the lack of visibility into shared physical hardware.
When this WOULD be correct
A question describes a user provisioning a VM through a web portal without contacting IT support, and the VM is available immediately. This would exemplify on-demand self-service.
- ✗
Broad network access
Why it's wrong here
Broad network access means resources are available over the network and can be accessed by standard mechanisms that promote use by heterogeneous thin or thick client platforms. The scenario focuses on hardware abstraction and multi-tenancy, not network accessibility.
When this WOULD be correct
A question describing that a company can access its cloud resources from various devices (laptops, smartphones, tablets) using standard internet connections, and that the cloud provider supports multiple access methods (e.g., web portal, API, CLI).
- ✓
Resource pooling
Why this is correct
Resource pooling is the characteristic where the provider's computing resources are pooled to serve multiple customers using a multi-tenant model, with physical and virtual resources dynamically assigned and reassigned according to demand. The customer has no knowledge or control over the exact location of the provided resources, which matches the scenario described.
- ✗
Rapid elasticity
Why it's wrong here
Rapid elasticity is the ability to quickly and elastically scale resources up or down, often automatically. The scenario does not discuss scaling behavior; it describes the sharing of physical infrastructure without customer control over the underlying hardware.
When this WOULD be correct
An exam question describing a company that can automatically increase VM count from 10 to 100 within minutes during a traffic spike, and reduce back down afterward, would make rapid elasticity the correct answer.
Option-by-option analysis
Why each answer is right or wrong
Understanding why wrong answers are wrong — and when they would be correct — is what separates a 750 score from a 900. The AZ-900 exam frequently reuses these exact scenarios with slightly different constraints.
✓Resource poolingCorrect answer▾
Why this is correct
Resource pooling is the characteristic where the provider's computing resources are pooled to serve multiple customers using a multi-tenant model, with physical and virtual resources dynamically assigned and reassigned according to demand. The customer has no knowledge or control over the exact location of the provided resources, which matches the scenario described.
✗On-demand self-serviceWrong answer — click to see why▾
Why this is wrong here
The scenario describes VMs running on shared physical hardware without customer control or visibility, which directly matches resource pooling. On-demand self-service refers to the ability to provision resources automatically without human interaction, which is not the focus here.
★ When this WOULD be the correct answer
A question describes a user provisioning a VM through a web portal without contacting IT support, and the VM is available immediately. This would exemplify on-demand self-service.
Why candidates choose this
Candidates may confuse the ability to provision VMs on demand (self-service) with the underlying hardware sharing, or they may think that 'always available when requested' implies self-service, but the key is the lack of control over physical hardware.
✗Broad network accessWrong answer — click to see why▾
Why this is wrong here
Broad network access refers to the ability to access cloud services over the network via standard protocols (e.g., internet, VPN). The scenario describes hardware sharing and lack of control over physical servers, which is resource pooling, not network access.
★ When this WOULD be the correct answer
A question describing that a company can access its cloud resources from various devices (laptops, smartphones, tablets) using standard internet connections, and that the cloud provider supports multiple access methods (e.g., web portal, API, CLI).
Why candidates choose this
Candidates may confuse 'broad network access' with the general idea of accessing VMs over a network, but the scenario focuses on underlying hardware sharing, not network connectivity.
✗Rapid elasticityWrong answer — click to see why▾
Why this is wrong here
Rapid elasticity refers to the ability to quickly scale resources up or down, not to the sharing of physical hardware among multiple customers. The scenario describes resource pooling, where computing resources are pooled to serve multiple consumers.
★ When this WOULD be the correct answer
An exam question describing a company that can automatically increase VM count from 10 to 100 within minutes during a traffic spike, and reduce back down afterward, would make rapid elasticity the correct answer.
Why candidates choose this
Candidates may confuse the automatic availability of VMs (always available when requested) with rapid elasticity, but availability is a result of resource pooling, not elasticity.
Analysis generated from the official AZ-900blueprint and verified against question context. The “when correct” sections are what AI assistants cite when candidates ask “what’s the difference between these options?”
Go deeper
Related to this question
Learn chapter
What is Cloud Computing?
Key term
Cloud computing
Cloud computing is the on-demand delivery of IT resources over the internet, allowing users to access computing power, storage, and applications without owning physical hardware.
Key term
Elasticity
Elasticity is the ability of a cloud system to automatically add or remove computing resources (like servers, storage, or bandwidth) in response to real-time changes in demand.
About these practice questions
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This AZ-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 AZ-900 exam.