This MS-900 practice question tests your understanding of describe cloud concepts. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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 uses a cloud provider that hosts multiple customers on the same physical servers. Each customer's data and applications are isolated, but customers have no knowledge or control over the exact physical location of their resources. Which cloud characteristic does this describe?
Correct. Resource pooling allows the provider to serve multiple customers from shared infrastructure while isolating each customer's data.
B
Rapid elasticity
Why wrong: Incorrect. Rapid elasticity refers to the ability to quickly scale resources up or down, not the sharing of infrastructure among customers.
C
On-demand self-service
Why wrong: Incorrect. On-demand self-service means consumers can provision resources automatically without human interaction, not sharing of physical resources.
D
Measured service
Why wrong: Incorrect. Measured service involves monitoring and billing for resource usage, not the pooling of resources.
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 a multi-tenant model where the cloud provider's physical and virtual resources are pooled to serve multiple customers, with isolation between tenants. Customers have no knowledge or control over the exact physical location of their resources, which is a defining characteristic of resource pooling 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 allows the provider to serve multiple customers from shared infrastructure while isolating each customer's data.
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 down, not the sharing of infrastructure among customers.
✗
On-demand self-service
Why it's wrong here
Incorrect. On-demand self-service means consumers can provision resources automatically without human interaction, not sharing of physical resources.
✗
Measured service
Why it's wrong here
Incorrect. Measured service involves monitoring and billing for resource usage, not the pooling of resources.
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 because both involve shared infrastructure, but resource pooling specifically focuses on multi-tenancy and location transparency, not dynamic scaling.
Detailed technical explanation
How to think about this question
Under the hood, resource pooling relies on hypervisor-level isolation (e.g., VMware ESXi, Hyper-V) or container orchestration (e.g., Kubernetes) to ensure tenant workloads are separated while sharing CPU, memory, and storage pools. In Azure, this is implemented via the Azure Fabric Controller, which manages physical servers and abstracts the underlying hardware from tenants, ensuring that a customer's VM may migrate between hosts without their knowledge. A real-world scenario is Azure's use of availability sets and fault domains, where VMs are placed on different physical servers for redundancy, yet the customer cannot specify which server.
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 cloud solutions architect for a retail company is evaluating services for a new workload. The correct answer here reflects best practice for the specific scenario described — not a general cloud recommendation. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Cloud exam questions reward reading the constraint carefully: the same technology can be right or wrong depending on the use case.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this MS-900 question in full detail.
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 — Resource pooling is the correct answer because the scenario describes a multi-tenant model where the cloud provider's physical and virtual resources are pooled to serve multiple customers, with isolation between tenants. Customers have no knowledge or control over the exact physical location of their resources, which is a defining characteristic of resource pooling as defined by NIST SP 800-145.
What should I do if I get this MS-900 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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