- A
Rapid elasticity
Why wrong: Rapid elasticity focuses on the ability to quickly scale resources up or down in response to demand, not on sharing physical infrastructure or logical isolation.
- B
Measured service
Why wrong: Measured service describes the metering and billing of cloud resource usage, enabling pay-as-you-go models. It does not directly address how physical resources are shared among multiple customers.
- C
Broad network access
Why wrong: Broad network access means resources are accessible over the network from various devices. It does not cover the sharing of physical hardware or logical separation of customer environments.
- D
Resource pooling
Resource pooling is correct because the scenario illustrates the provider using shared physical servers to serve multiple customers (multi-tenancy) while maintaining logical isolation. This is a defining characteristic of cloud computing.
Quick Answer
The answer is resource pooling. This scenario is a textbook example because the cloud provider aggregates powerful physical servers to host virtual machines from thousands of organizations, dynamically assigning computing resources like processing and memory across a multi-tenant model while using logical isolation—such as hypervisor-level segmentation—to ensure each tenant’s data remains secure and inaccessible to others. On the Microsoft Azure Fundamentals AZ-900 exam, this concept tests your understanding of the five essential characteristics of cloud computing, often appearing in scenario-based questions where shared hardware raises security concerns; a common trap is confusing resource pooling with rapid elasticity, but remember that pooling focuses on multi-tenant sharing and logical boundaries, not automatic scaling. For a quick memory tip, think of a large apartment building: many tenants share the same physical structure (pooling), but each has a locked door (logical isolation) that prevents neighbors from entering.
AZ-900 Describe cloud concepts Practice Question
This AZ-900 practice question tests your understanding of describe cloud concepts. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
A company's IT manager is evaluating a public cloud provider. The provider's data center contains powerful physical servers that host virtual machines from thousands of different organizations. The manager is concerned about security, but the provider assures that each organization's VMs are logically isolated and cannot access each other's data, even though they share the same hardware. Which essential characteristic of cloud computing does this scenario best describe?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue:
"best"Why it matters: Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
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
The scenario describes resource pooling because the provider's physical servers host VMs from multiple organizations, and logical isolation ensures each tenant's data remains separate. Resource pooling is the cloud characteristic where computing resources (e.g., storage, processing, memory) are aggregated to serve multiple customers using a multi-tenant model, with physical and virtual resources dynamically assigned and reassigned according to demand. The provider's assurance of logical isolation (e.g., via hypervisor-level segmentation or VLANs) is a direct implementation of resource pooling's security boundary.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
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 focuses on the ability to quickly scale resources up or down in response to demand, not on sharing physical infrastructure or logical isolation.
- ✗
Measured service
Why it's wrong here
Measured service describes the metering and billing of cloud resource usage, enabling pay-as-you-go models. It does not directly address how physical resources are shared among multiple customers.
- ✗
Broad network access
Why it's wrong here
Broad network access means resources are accessible over the network from various devices. It does not cover the sharing of physical hardware or logical separation of customer environments.
- ✓
Resource pooling
Why this is correct
Resource pooling is correct because the scenario illustrates the provider using shared physical servers to serve multiple customers (multi-tenancy) while maintaining logical isolation. This is a defining characteristic of cloud computing.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse 'resource pooling' with 'rapid elasticity' because both involve shared infrastructure, but resource pooling is about multi-tenancy and logical isolation, while rapid elasticity is about dynamic scaling of resources.
Detailed technical explanation
How to think about this question
Under the hood, resource pooling relies on a hypervisor (e.g., VMware ESXi, Hyper-V) to abstract physical hardware and enforce strict memory and process isolation between guest VMs using hardware-assisted virtualization (e.g., Intel VT-x or AMD-V). In real-world scenarios, a provider like AWS uses resource pooling in its EC2 service, where a single physical host runs instances from different customers, with the Nitro hypervisor providing hardware-level isolation to prevent cross-tenant data leaks. This characteristic is defined in NIST SP 800-145 as one of the five essential cloud characteristics.
KKey Concepts to Remember
- Read the scenario before looking for a memorised answer.
- Find the constraint that changes the correct option.
- Eliminate answers that are true in general but not in this case.
TExam Day Tips
- Watch for words such as best, first, most likely and least administrative effort.
- Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A media company stores terabytes of video archives that are accessed once a year for audit purposes. Moving these objects to a cold storage tier (Azure Archive, S3 Glacier, or Google Nearline) costs a fraction of hot storage. Questions like this test whether you understand storage tiers, access frequency tradeoffs, and retrieval latency requirements.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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FAQ
Questions learners often ask
What does this AZ-900 question test?
Describe cloud concepts — This question tests Describe cloud concepts — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Resource pooling — The scenario describes resource pooling because the provider's physical servers host VMs from multiple organizations, and logical isolation ensures each tenant's data remains separate. Resource pooling is the cloud characteristic where computing resources (e.g., storage, processing, memory) are aggregated to serve multiple customers using a multi-tenant model, with physical and virtual resources dynamically assigned and reassigned according to demand. The provider's assurance of logical isolation (e.g., via hypervisor-level segmentation or VLANs) is a direct implementation of resource pooling's security boundary.
What should I do if I get this AZ-900 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Are there clue words in this question I should notice?
Yes — watch for: "best". Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 11, 2026
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.
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