This MS-900 practice question tests your understanding of describe cloud concepts. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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 characteristic of cloud computing allows a user to provision resources automatically without requiring human interaction with the service 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
Option C is correct because on-demand self-service is a fundamental characteristic of cloud computing defined by NIST (SP 800-145) that allows a user to unilaterally provision computing capabilities, such as server time and network storage, as needed automatically without requiring human interaction with each service provider. This is typically implemented through a web portal or API (e.g., AWS Console, Azure Portal, or RESTful APIs) that enables instant resource creation and configuration.
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 is the ability to scale quickly, not automatic provisioning without interaction.
✗
Resource pooling
Why it's wrong here
Resource pooling means multiple customers share the same physical resources, not automated provisioning.
✓
On-demand self-service
Why this is correct
On-demand self-service allows users to automatically get resources as needed without manual intervention.
Related concept
Read the scenario before looking for a memorised answer.
✗
Measured service
Why it's wrong here
Measured service refers to metering and billing for usage, not provisioning.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse 'rapid elasticity' with 'on-demand self-service' because both involve automation, but rapid elasticity focuses on scaling existing resources while on-demand self-service is about the initial provisioning without human intervention.
Detailed technical explanation
How to think about this question
Under the hood, on-demand self-service relies on orchestration layers (e.g., OpenStack Heat, AWS CloudFormation, Azure Resource Manager) that abstract underlying hardware and virtualization. A user sends a REST API call (e.g., POST /compute/v2.1/servers in OpenStack) with desired parameters, and the cloud controller automatically allocates resources from the pool without any manual approval. In a real-world scenario, a developer can spin up 100 VMs for a load test in minutes via CLI or SDK, which would be impossible without this characteristic.
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 — Option C is correct because on-demand self-service is a fundamental characteristic of cloud computing defined by NIST (SP 800-145) that allows a user to unilaterally provision computing capabilities, such as server time and network storage, as needed automatically without requiring human interaction with each service provider. This is typically implemented through a web portal or API (e.g., AWS Console, Azure Portal, or RESTful APIs) that enables instant resource creation and configuration.
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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