Rapid Elasticity
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?
Quick Answer
Rapid elasticity is the cloud computing characteristic this scenario demonstrates, since the defining detail is that virtual servers are added automatically during a traffic surge and removed automatically once traffic subsides, with no manual intervention from the IT team at either end of that cycle. This automatic, bidirectional scaling in direct response to real-time demand is exactly what NIST SP 800-145 defines as rapid elasticity — capacity that expands and contracts to match need, ideally without a human triggering either action. A promotional event causing a sudden traffic spike is a classic elasticity scenario because the demand pattern is unpredictable in timing and short in duration, making manual capacity planning impractical; the infrastructure has to react on its own. The absence of manual intervention is the specific detail that confirms elasticity rather than simple scalability, since a system that could eventually be resized by an administrator would demonstrate scalability but not the automated responsiveness that elasticity specifically requires.
⚠ Common exam trap
Many 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.
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
✓
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.
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.
- ✗
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.
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Same concept, more angles
1 more way this is tested on MS-900
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Variation 1. A retail company experiences sudden traffic spikes during holiday sales. Which cloud characteristic would best help them handle this without overprovisioning?
medium- A.Broad network access
- B.Measured service
- ✓ C.Rapid elasticity
- D.Resource pooling
Why C: (Rapid elasticity) is correct because it enables cloud resources to automatically scale up or down to handle sudden traffic spikes without the need for overprovisioning. Option A (Broad network access) refers to accessibility over the network, not scaling. Option B (Measured service) is about metering and billing for usage. Option D (Resource pooling) involves multi-tenant sharing of resources.
JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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