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 storage service that automatically increases its storage capacity without any manual intervention as new files are added. This behavior is an example of which cloud computing characteristic?
Why wrong: On-demand self-service allows users to provision resources without human interaction, but it does not describe automatic scaling of storage.
B
Broad network access
Why wrong: Broad network access means resources can be accessed from various devices over the network, not automatic capacity scaling.
C
Resource pooling
Why wrong: Resource pooling refers to serving multiple customers from the same physical resources; it does not involve automatic scaling.
D
Rapid elasticity
Rapid elasticity enables resources to scale automatically in response to demand, which is exactly what the storage service does.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Rapid elasticity
The scenario describes storage capacity automatically increasing as new files are added, which is the essence of rapid elasticity. This cloud characteristic allows resources to scale out and in automatically, often to the point where the user perceives unlimited capacity, without requiring manual provisioning or intervention.
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.
✗
On-demand self-service
Why it's wrong here
On-demand self-service allows users to provision resources without human interaction, but it does not describe automatic scaling of storage.
✗
Broad network access
Why it's wrong here
Broad network access means resources can be accessed from various devices over the network, not automatic capacity scaling.
✗
Resource pooling
Why it's wrong here
Resource pooling refers to serving multiple customers from the same physical resources; it does not involve automatic scaling.
✓
Rapid elasticity
Why this is correct
Rapid elasticity enables resources to scale automatically in response to demand, which is exactly what the storage service does.
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 often confuse 'resource pooling' (the multi-tenant sharing of resources) with 'rapid elasticity' (the ability to scale resources up/down automatically), because both involve dynamic allocation, but pooling is about sharing among tenants while elasticity is about scaling for a single tenant's demand.
Detailed technical explanation
How to think about this question
Under the hood, rapid elasticity is often implemented via auto-scaling groups (e.g., AWS Auto Scaling, Azure Virtual Machine Scale Sets) or storage services that use thin provisioning and on-demand allocation from a shared pool. For example, Azure Blob Storage can automatically handle growth up to the account's maximum capacity (500 TiB by default, extendable to 5 PiB) without manual intervention, leveraging a flat namespace and partition splitting. A subtle behavior is that elasticity can be both horizontal (adding more storage nodes) and vertical (increasing the size of a single volume), but the user experience is seamless because the service abstracts the underlying scaling operations.
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: Rapid elasticity — The scenario describes storage capacity automatically increasing as new files are added, which is the essence of rapid elasticity. This cloud characteristic allows resources to scale out and in automatically, often to the point where the user perceives unlimited capacity, without requiring manual provisioning or intervention.
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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