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MS-900 Describe cloud concepts Practice Question
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.
Which of the following are key characteristics of cloud computing as defined by the National Institute of Standards and Technology (NIST)? (Choose all that apply. There are four correct answers.)
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
✓
On-demand self-service
The NIST SP 800-145 definition identifies five essential characteristics of cloud computing: on-demand self-service, broad network access, resource pooling, rapid elasticity, and measured service. On-demand self-service allows users to provision computing capabilities automatically without requiring human interaction with each service provider. Broad network access means capabilities are available over the network and accessed through standard mechanisms (e.g., mobile phones, laptops, workstations). Resource pooling enables the provider's computing resources to serve multiple consumers using a multi-tenant model, with physical and virtual resources dynamically assigned and reassigned according to consumer demand. Rapid elasticity allows capabilities to be elastically provisioned and released, in some cases automatically, to scale rapidly outward and inward commensurate with demand.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Microsoft often tests that candidates confuse 'measured service' (the fifth NIST characteristic) as one of the four correct answers, but the question explicitly asks for four correct answers and omits measured service, so the trap is to include it or to incorrectly select 'Fixed, non-scalable capacity' as a valid characteristic.
Detailed technical explanation
How to think about this question
Under the hood, NIST's five characteristics are not just abstract—they map to real-world implementations: on-demand self-service is often realized via RESTful APIs (e.g., AWS EC2 API calls) that automate provisioning without human intervention. Resource pooling leverages hypervisor-level multi-tenancy (e.g., VMware vSphere or KVM) to abstract physical hardware, while rapid elasticity is achieved through auto-scaling groups that monitor CPU/memory thresholds and spin up/down instances in minutes. A subtle behavior is that measured service (the fifth characteristic) is often overlooked—cloud providers meter usage at a granular level (e.g., per-hour or per-GB) to enable pay-per-use billing, which is essential for the economic model but not listed in the four correct answers here.
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 company's IT admin needs to give a contractor read-only access to production logs without sharing account credentials. Using role-based access control (RBAC) and temporary scoped permissions — not a permanent shared password — is the correct pattern. Questions like this test whether you can apply least-privilege access across cloud identity services.
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FAQ
Questions learners often ask
What does this MS-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: On-demand self-service — The NIST SP 800-145 definition identifies five essential characteristics of cloud computing: on-demand self-service, broad network access, resource pooling, rapid elasticity, and measured service. On-demand self-service allows users to provision computing capabilities automatically without requiring human interaction with each service provider. Broad network access means capabilities are available over the network and accessed through standard mechanisms (e.g., mobile phones, laptops, workstations). Resource pooling enables the provider's computing resources to serve multiple consumers using a multi-tenant model, with physical and virtual resources dynamically assigned and reassigned according to consumer demand. Rapid elasticity allows capabilities to be elastically provisioned and released, in some cases automatically, to scale rapidly outward and inward commensurate with demand.
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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Last reviewed: Jun 30, 2026
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