- A
Resource pooling
Correct. Resource pooling (often called multi-tenancy) is the cloud characteristic where computing resources are pooled to serve multiple customers, with physical and virtual resources dynamically assigned and reassigned according to demand. Customers typically have no control over the exact physical location of the resources, but logical isolation ensures security.
- B
Rapid elasticity
Why wrong: Incorrect. Rapid elasticity refers to the ability to quickly scale resources up or out (and back down or in) to match demand. It does not specifically describe sharing physical infrastructure among multiple customers.
- C
Measured service
Why wrong: Incorrect. Measured service means cloud resource usage can be monitored, controlled, and reported, providing transparency for both provider and customer. It is about metering and billing, not about sharing physical hardware.
- D
On-demand self-service
Why wrong: Incorrect. On-demand self-service allows customers to provision computing capabilities automatically without requiring human interaction with the provider. It describes the provisioning process, not the underlying sharing of physical infrastructure.
Quick Answer
The answer is resource pooling, the cloud characteristic that enables a provider to serve multiple customers from shared physical hardware. This is correct because resource pooling in cloud computing relies on virtualization technology to create logically isolated environments—each tenant’s data, applications, and operating systems remain secure and separate, even though they share the same underlying server’s storage, memory, and network bandwidth. On the Microsoft Azure Fundamentals AZ-900 exam, this scenario tests your understanding of the NIST SP 800-145 definition of cloud computing, often appearing as a multi-tenant scenario where the key trap is confusing resource pooling with rapid elasticity or scalability. Remember, if the focus is on sharing hardware while keeping tenants isolated, it’s resource pooling—think of an apartment building where each unit is private but the foundation is shared.
AZ-900 Describe cloud concepts Practice Question
This AZ-900 practice question tests your understanding of describe cloud concepts. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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 cloud provider uses virtualization technology to host multiple customers on the same physical server. Each customer's data, applications, and operating systems are logically isolated and secured from one another. Which 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
This scenario describes resource pooling, where the provider's computing resources (such as storage, memory, and network bandwidth) are pooled to serve multiple customers using a multi-tenant model. Virtualization technology creates isolated virtual machines for each tenant, ensuring logical separation of data and applications while sharing the same physical hardware. This is a core characteristic of cloud computing as defined by NIST SP 800-145.
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.
- ✓
Resource pooling
Why this is correct
Correct. Resource pooling (often called multi-tenancy) is the cloud characteristic where computing resources are pooled to serve multiple customers, with physical and virtual resources dynamically assigned and reassigned according to demand. Customers typically have no control over the exact physical location of the resources, but logical isolation ensures security.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Rapid elasticity
Why it's wrong here
Incorrect. Rapid elasticity refers to the ability to quickly scale resources up or out (and back down or in) to match demand. It does not specifically describe sharing physical infrastructure among multiple customers.
- ✗
Measured service
Why it's wrong here
Incorrect. Measured service means cloud resource usage can be monitored, controlled, and reported, providing transparency for both provider and customer. It is about metering and billing, not about sharing physical hardware.
- ✗
On-demand self-service
Why it's wrong here
Incorrect. On-demand self-service allows customers to provision computing capabilities automatically without requiring human interaction with the provider. It describes the provisioning process, not the underlying sharing of physical infrastructure.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse resource pooling with rapid elasticity, thinking that 'pooling' implies dynamic scaling, but resource pooling specifically refers to the multi-tenant sharing of physical infrastructure, not the speed of resource allocation.
Detailed technical explanation
How to think about this question
Under the hood, resource pooling relies on a hypervisor (e.g., VMware ESXi, Microsoft Hyper-V, or KVM) that abstracts physical hardware and allocates virtual resources to each tenant's VM. The hypervisor enforces isolation through hardware-assisted virtualization (e.g., Intel VT-x or AMD-V) and memory segmentation, preventing one tenant from accessing another's data. In real-world scenarios, this allows a single server to host a bank's PCI-compliant workload alongside a retail company's application, with strict security boundaries maintained by the hypervisor's memory and I/O isolation mechanisms.
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 — This scenario describes resource pooling, where the provider's computing resources (such as storage, memory, and network bandwidth) are pooled to serve multiple customers using a multi-tenant model. Virtualization technology creates isolated virtual machines for each tenant, ensuring logical separation of data and applications while sharing the same physical hardware. This is a core characteristic of cloud computing as defined by NIST SP 800-145.
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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