This MS-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 allows customers to provision virtual machines, storage, and other resources through a web portal without requiring human interaction with the provider's staff. Which cloud computing characteristic does this best illustrate?
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.
Why wrong: Rapid elasticity refers to the ability to quickly scale resources up or down, not the automatic provisioning without human contact.
B
Measured service
Why wrong: Measured service is about metering and billing based on usage, not about self-service provisioning.
C
Resource pooling
Why wrong: Resource pooling means that the provider's computing resources are shared among multiple customers, not the self-service aspect.
D
On-demand self-service
This is the definition of on-demand self-service: consumers can unilaterally provision computing capabilities without requiring human interaction with the provider.
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 scenario describes a user provisioning resources through a web portal without any human interaction from the provider. This directly matches the NIST SP 800-145 definition of on-demand self-service, where a consumer can unilaterally provision computing capabilities as needed automatically without requiring human interaction with each service provider.
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 refers to the ability to quickly scale resources up or down, not the automatic provisioning without human contact.
✗
Measured service
Why it's wrong here
Measured service is about metering and billing based on usage, not about self-service provisioning.
✗
Resource pooling
Why it's wrong here
Resource pooling means that the provider's computing resources are shared among multiple customers, not the self-service aspect.
✓
On-demand self-service
Why this is correct
This is the definition of on-demand self-service: consumers can unilaterally provision computing capabilities without requiring human interaction with the provider.
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 the 'self-service' aspect of provisioning with 'rapid elasticity' because both involve speed, but the question specifically highlights the lack of human interaction, which is the defining feature of on-demand self-service, not the scaling behavior.
Detailed technical explanation
How to think about this question
Under the hood, on-demand self-service is enabled by a service catalog and orchestration layer that abstracts the underlying infrastructure. For example, in Microsoft Azure, the Azure Resource Manager (ARM) API processes provisioning requests from the portal, CLI, or SDK, automating the deployment of VMs, storage, and networking without any manual intervention from Microsoft staff. This characteristic is foundational to cloud computing, as it eliminates the traditional IT procurement delays and enables near-instant resource availability.
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.
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: On-demand self-service — The scenario describes a user provisioning resources through a web portal without any human interaction from the provider. This directly matches the NIST SP 800-145 definition of on-demand self-service, where a consumer can unilaterally provision computing capabilities as needed automatically without requiring human interaction with each service provider.
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.
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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Question Discussion
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