AZ-900 Describe cloud concepts Practice Question
A healthcare organization migrates its patient data management application to Azure. The organization's compliance team learns that Azure's underlying physical infrastructure, including servers and storage, is shared by many customers globally. The team is concerned about data leakage and wants to understand which fundamental cloud computing characteristic allows the provider to share physical hardware among multiple tenants while ensuring that each tenant's data and compute resources remain logically isolated and secure from one another.
⚠ Common exam trap
Test-takers frequently confuse resource pooling with security isolation mechanisms like encryption or firewalls, but the question specifically asks for the fundamental cloud characteristic that enables shared physical hardware with logical isolation, which is resource pooling, not a specific security feature.
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 it is the fundamental cloud computing characteristic that enables a provider to serve multiple customers (tenants) from the same physical hardware while maintaining logical isolation. In Azure, this is achieved through hypervisor-level virtualization (e.g., Hyper-V) where each tenant's virtual machines and data are isolated at the kernel and memory level, preventing cross-tenant data leakage even though the underlying servers and storage are shared.
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 to quickly scale resources up or down based on demand. While important for handling variable workloads, it does not directly address the sharing of physical infrastructure with logical isolation among tenants.
When this WOULD be correct
A question asking which cloud characteristic allows a company to automatically add virtual machines during a sudden traffic spike and remove them when demand drops would have rapid elasticity as the correct answer.
- ✓
Resource pooling
Why this is correct
Resource pooling is the correct characteristic. It means the cloud provider's computing resources are pooled to serve multiple customers using a multi-tenant model, with strict logical isolation so that each tenant's data and processes are secure and private, even though they share the same physical hardware.
- ✗
Measured service
Why it's wrong here
Measured service is a cloud characteristic centered on usage tracking, metering, and pay-as-you-go billing, where customers pay for the exact amount of compute, storage, or bandwidth they consume. This model enables cost optimization and resource governance, but it has no role in explaining how multiple tenants can securely share the same underlying physical hardware. While metering may track per-tenant consumption in a shared environment, it does not create the logical isolation or pooling of resources that defines multi-tenancy. Therefore, measured service is incorrect for this question because it addresses financial accountability, not tenant-specific security or infrastructure sharing.
When this WOULD be correct
An exam question asking which cloud characteristic enables pay-per-use billing and resource usage monitoring would have measured service as the correct answer.
- ✗
Broad network access
Why it's wrong here
Broad network access refers to the ability of customers to access cloud resources over the internet from any standard device, such as laptops, smartphones, or tablets, using standard network protocols. This characteristic emphasizes ubiquitous connectivity and device-independent access, which improves usability but does not explain how the cloud provider's physical infrastructure is pooled and logically isolated for multiple tenants. It says nothing about the multi-tenant model, resource sharing, or the security boundaries that keep each customer's data private on the same hardware. Thus, broad network access is incorrect here because it concerns network reachability, not the architectural mechanism of resource pooling.
When this WOULD be correct
A question that asks: 'Which cloud characteristic enables users to access resources from various devices (e.g., laptops, smartphones) over the internet using standard protocols?' would make broad network access 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 correct characteristic. It means the cloud provider's computing resources are pooled to serve multiple customers using a multi-tenant model, with strict logical isolation so that each tenant's data and processes are secure and private, even though they share the same physical hardware.
✗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 logical isolation of tenant data on shared physical hardware.
★ When this WOULD be the correct answer
A question asking which cloud characteristic allows a company to automatically add virtual machines during a sudden traffic spike and remove them when demand drops would have rapid elasticity as the correct answer.
Why candidates choose this
Candidates may confuse the dynamic scaling aspect of cloud computing with the multi-tenant isolation, thinking that elasticity somehow separates tenants by dynamically allocating resources.
✗Measured serviceWrong answer — click to see why▾
Why this is wrong here
Measured service refers to metering and billing of cloud resource usage, not to logical isolation of tenant data on shared physical infrastructure.
★ When this WOULD be the correct answer
An exam question asking which cloud characteristic enables pay-per-use billing and resource usage monitoring would have measured service as the correct answer.
Why candidates choose this
Candidates may confuse 'measured service' with the idea of measuring or controlling access, but it actually pertains to usage tracking and cost allocation.
✗Broad network accessWrong answer — click to see why▾
Why this is wrong here
Broad network access refers to the ability to access cloud resources over the network via standard protocols, not to multi-tenant isolation. The question specifically asks about sharing physical hardware while ensuring logical isolation, which is resource pooling.
★ When this WOULD be the correct answer
A question that asks: 'Which cloud characteristic enables users to access resources from various devices (e.g., laptops, smartphones) over the internet using standard protocols?' would make broad network access the correct answer.
Why candidates choose this
Candidates may confuse 'broad network access' with the idea of accessing shared infrastructure, but it actually describes network connectivity, not multi-tenancy or isolation.
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
Hypervisor
A hypervisor is software that creates and runs virtual machines by allowing multiple operating systems to share a single hardware host.
About these practice questions
Courseiva writes every AZ-900 question from scratch — 981 in total, each with an explanation and a wrong-answer breakdown. None are copied from real exams or dumps. Learn why practice questions differ from exam dumps →
JA
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.