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's e-commerce website experiences a sudden surge in traffic during a promotional event. The cloud infrastructure automatically adds additional virtual servers to handle the load and removes them when traffic subsides, without any manual intervention from the IT team. Which cloud computing characteristic does this demonstrate?
Correct. Rapid elasticity allows automatic scaling of resources to meet fluctuating demand, as described in the scenario.
B
On-demand self-service
Why wrong: Incorrect. On-demand self-service refers to a user provisioning resources without provider intervention, but does not imply automatic scaling.
C
Resource pooling
Why wrong: Incorrect. Resource pooling means the provider's resources are shared among multiple customers, not the ability to scale automatically.
D
Measured service
Why wrong: Incorrect. Measured service refers to monitoring and billing based on usage, not automatic scaling.
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 the cloud infrastructure automatically scaling virtual servers up and down in response to traffic changes, which is the defining characteristic of rapid elasticity. This capability allows resources to be provisioned and released elastically, often automatically, to match demand at any given time, 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.
✓
Rapid elasticity
Why this is correct
Correct. Rapid elasticity allows automatic scaling of resources to meet fluctuating demand, as described in the scenario.
Related concept
Read the scenario before looking for a memorised answer.
✗
On-demand self-service
Why it's wrong here
Incorrect. On-demand self-service refers to a user provisioning resources without provider intervention, but does not imply automatic scaling.
✗
Resource pooling
Why it's wrong here
Incorrect. Resource pooling means the provider's resources are shared among multiple customers, not the ability to scale automatically.
✗
Measured service
Why it's wrong here
Incorrect. Measured service refers to monitoring and billing based on usage, not automatic scaling.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse 'on-demand self-service' (manual provisioning by a user) with 'rapid elasticity' (automatic scaling by the cloud platform), but the key differentiator is the lack of manual intervention in the scenario.
Detailed technical explanation
How to think about this question
Under the hood, rapid elasticity is often implemented using auto-scaling groups (e.g., AWS Auto Scaling, Azure Virtual Machine Scale Sets) that monitor metrics like CPU utilization or request count against a target threshold. When the metric breaches the threshold, the scaling engine triggers a scale-out action by launching new VM instances from a pre-configured image, and when traffic drops, it performs a scale-in action to terminate idle instances. A subtle behavior is that elasticity can be horizontal (adding/removing instances) or vertical (resizing existing instances), but horizontal scaling is more common for stateless web tiers to maintain performance during surges.
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: Rapid elasticity — The scenario describes the cloud infrastructure automatically scaling virtual servers up and down in response to traffic changes, which is the defining characteristic of rapid elasticity. This capability allows resources to be provisioned and released elastically, often automatically, to match demand at any given time, 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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