220-1101 Virtualization and Cloud Computing Practice Question
A company hosts its e-commerce website on a public cloud platform. During the holiday shopping season, traffic increases dramatically. The cloud platform automatically adds more virtual server instances to handle the increased load and then removes them when traffic returns to normal. Which cloud computing characteristic does this scenario BEST describe?
⚠ Common exam trap
CompTIA often tests the distinction between 'on-demand self-service' (manual user-initiated provisioning) and 'rapid elasticity' (automatic scaling based on demand), causing candidates to confuse the user's ability to provision resources with the system's ability to scale them automatically.
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 automatically scaling virtual server instances up and down in response to traffic spikes, which is the defining characteristic of rapid elasticity. This allows resources to be provisioned and released elastically, often automatically, to match demand at any given time.
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
This refers to a consumer's ability to unilaterally provision computing capabilities, such as server time and network storage, without requiring human interaction with each service provider. It is about initial provisioning and management, not the dynamic, automatic adjustment of capacity in response to fluctuating traffic. In the scenario, the website automatically scales with demand, which is a characteristic of elasticity, not self-service.
- ✓
Rapid elasticity
Why this is correct
Capabilities can be elastically provisioned and released, in some cases automatically, to scale rapidly outward and inward commensurate with demand. For an e-commerce site, this means compute and storage resources automatically increase during peak shopping periods and shrink afterward. This is a core NIST characteristic and directly matches the scenario's description of scaling with demand.
- ✗
Measured service
Why it's wrong here
Cloud systems automatically control and optimize resource use by leveraging a metering capability at some level of abstraction appropriate to the type of service (e.g., storage, processing, bandwidth). This is about pay-per-use billing and usage monitoring, not about changing resource allocation. Although metering provides data that could inform scaling decisions, it is not the mechanism that automatically adjusts capacity in response to demand.
- ✗
Resource pooling
Why it's wrong here
The provider's computing resources are pooled to serve multiple consumers using a multi-tenant model, with different physical and virtual resources dynamically assigned and reassigned according to consumer demand. This describes a location-independent pool, not the rapid scaling action itself. While pooling underlies elasticity, it refers to the shared infrastructure model rather than the ability to scale a single customer's e-commerce site up and down.
Go deeper
Related to this question
Learn chapter
Edge Computing and IoT
Key term
Anything As A Service
A model where you rent any IT resource or service over the internet instead of owning it.
Key term
Software as a Service
Software as a Service (SaaS) is a cloud computing model where users access software applications over the internet on a subscription basis, without installing or maintaining the software locally.
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Same concept, more angles
5 more ways this is tested on 220-1101
These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. A company hosts its e-commerce website on a public cloud platform. During a marketing campaign, the website experiences a sudden, unplanned spike in traffic. The cloud environment automatically provisions additional virtual servers to handle the load and later decommissions them when traffic returns to normal. This capability is BEST described by which cloud computing characteristic?
medium- A.High availability
- ✓ B.Elasticity
- C.Fault tolerance
- D.Disaster recovery
Why B: Elasticity is the cloud computing characteristic that enables automatic scaling of resources up or down based on demand. In this scenario, the cloud platform provisions additional virtual servers during a traffic spike and decommissions them when traffic normalizes, which is the precise definition of elasticity. This differs from high availability, which focuses on uptime through redundancy, not dynamic scaling.
Variation 2. A company runs its e-commerce platform on a private cloud but expects a large traffic spike during a promotional event. They want to automatically add additional virtual servers from a public cloud provider during the peak and release them afterward. Which cloud computing characteristic best describes this capability?
hard- A.High availability
- ✓ B.Elasticity
- C.Fault tolerance
- D.Resource pooling
Why B: Elasticity is the cloud computing characteristic that allows resources to be automatically scaled up or down based on demand. In this scenario, the company uses a hybrid cloud model where additional virtual servers from a public cloud provider are provisioned during a traffic spike and released afterward, which is the definition of elasticity. This contrasts with scalability, which is the ability to handle growth over time, as elasticity specifically addresses dynamic, automated scaling to match fluctuating workloads.
Variation 3. A company hosts its e-commerce website on a public cloud IaaS platform. During a flash sale, traffic spikes to 10 times the normal volume. The cloud platform automatically provisions additional virtual servers to handle the increased load and then deprovisions them after the sale ends, requiring no manual intervention. Which essential cloud characteristic does this scenario BEST demonstrate?
easy- A.High availability
- B.Fault tolerance
- ✓ C.Rapid elasticity
- D.Load balancing
Why C: The scenario describes the cloud platform automatically scaling virtual server resources up and down in response to demand spikes, with no manual intervention. This is the defining characteristic of rapid elasticity, which allows resources to be provisioned and released elastically, often automatically, to match workload fluctuations. The key is the dynamic scaling triggered by traffic changes, not the mere presence of redundancy or distribution.
Variation 4. A small e-commerce company hosts its website on a public cloud IaaS platform. During a promotional sale, traffic increases dramatically. The cloud platform automatically provisions additional virtual machines within minutes to handle the load. The company only pays for the additional resources used during that time. Which essential cloud characteristic does this scenario BEST demonstrate?
easy- A.On-demand self-service
- ✓ B.Rapid elasticity
- C.Measured service
- D.Resource pooling
Why B: The scenario describes the cloud platform automatically provisioning additional virtual machines within minutes to handle a sudden traffic spike, and the company only paying for the extra resources used during that time. This directly demonstrates rapid elasticity, which is the ability to scale resources up or down automatically and quickly in response to demand. The key is the automatic scaling and the pay-per-use model for the additional capacity, which are hallmarks of elasticity in cloud computing.
Variation 5. A company runs an e-commerce website on a public cloud IaaS platform. During a flash sale, traffic spikes to 10 times the normal volume. The website automatically scales its resources to handle the increased load and returns to normal capacity after the sale, with no manual intervention required. Which cloud computing characteristic does this scenario BEST demonstrate?
medium- A.High availability
- ✓ B.Elasticity
- C.Fault tolerance
- D.Scalability
Why B: Elasticity is the cloud characteristic that allows resources to automatically scale up during demand spikes and scale down when demand subsides, without manual intervention. In this scenario, the IaaS platform dynamically provisions additional compute and network resources to handle 10x traffic during the flash sale, then releases them afterward, which is the defining behavior of elasticity.
JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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