CLF-C02 Cloud Concepts Practice Question
A company runs a retail website on AWS. During a promotional event, the website's traffic spikes from 1,000 concurrent users to 100,000 concurrent users in under 5 minutes. The AWS infrastructure automatically provisions additional Amazon EC2 instances to handle the increased load and terminates them when the event ends. Which essential characteristic of cloud computing does this scenario best demonstrate?
⚠ Common exam trap
Many exam-takers confuse 'rapid elasticity' with 'on-demand self-service' because both involve provisioning resources without manual intervention, but on-demand self-service is about the user's ability to provision resources on their own, while rapid elasticity is about the system automatically scaling resources up and down to meet demand.
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 automatic scaling of EC2 instances from 1,000 to 100,000 concurrent users in under 5 minutes, and then terminating them when the event ends. This directly demonstrates rapid elasticity, which is the ability to provision and release cloud resources quickly and automatically in response to demand, a core characteristic defined by the NIST SP 800-145 standard.
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 requiring human interaction with the service provider. While the scenario involves automatic provisioning, the key is the speed of scaling in response to demand, which is more specifically captured by rapid elasticity. On-demand self-service is about the ability to initiate provisioning, not the automatic scaling behavior described.
When this WOULD be correct
A question where a user manually launches an EC2 instance via the AWS Management Console without needing to contact AWS support would demonstrate on-demand self-service. For example: 'A developer needs to spin up a test server outside business hours and does so through the console without any manual approval.'
- ✗
Broad network access
Why it's wrong here
Broad network access means that resources are accessible over the network from a variety of client platforms (e.g., mobile phones, laptops). The scenario focuses on scaling capacity to handle traffic, not on the network accessibility of the resources.
When this WOULD be correct
A company deploys a web application on AWS and needs to ensure employees can access it from various devices (laptops, tablets, smartphones) over the internet. The question asks which cloud characteristic enables this universal access. Broad network access would be correct.
- ✓
Rapid elasticity
Why this is correct
Rapid elasticity is the ability to quickly and automatically scale resources up and down in response to fluctuating demand. The automatic addition and removal of EC2 instances during a traffic spike perfectly illustrates this characteristic, as the system adapts to the workload in near real-time.
- ✗
Resource pooling
Why it's wrong here
Resource pooling refers to the provider's computing resources being pooled to serve multiple customers using a multi-tenant model, with physical and virtual resources dynamically assigned. The scenario does not address multi-tenancy or location independence; it focuses on scaling capacity for a single application.
When this WOULD be correct
A question describing how a cloud provider serves multiple customers from the same physical infrastructure, where customers have no knowledge of each other's resource usage, would make resource pooling the correct answer.
Option-by-option analysis
Why each answer is right or wrong
Understanding why wrong answers are wrong — and when they would be correct — is what separates a 750 score from a 900. The CLF-C02 exam frequently reuses these exact scenarios with slightly different constraints.
✓Rapid elasticityCorrect answer▾
Why this is correct
Rapid elasticity is the ability to quickly and automatically scale resources up and down in response to fluctuating demand. The automatic addition and removal of EC2 instances during a traffic spike perfectly illustrates this characteristic, as the system adapts to the workload in near real-time.
✗On-demand self-serviceWrong answer — click to see why▾
Why this is wrong here
The scenario describes automatic scaling triggered by traffic spikes, which is rapid elasticity. On-demand self-service refers to a user provisioning resources without human interaction, not automatic scaling based on load.
★ When this WOULD be the correct answer
A question where a user manually launches an EC2 instance via the AWS Management Console without needing to contact AWS support would demonstrate on-demand self-service. For example: 'A developer needs to spin up a test server outside business hours and does so through the console without any manual approval.'
Why candidates choose this
Candidates may confuse the ability to provision resources on demand (self-service) with the automatic scaling aspect, not realizing that on-demand self-service is about user-initiated provisioning, not automated elasticity.
✗Broad network accessWrong answer — click to see why▾
Why this is wrong here
Broad network access refers to the ability to access cloud resources over the network using standard protocols, not to automatically scaling resources based on demand. The scenario describes rapid scaling of EC2 instances, which is elasticity, not network access.
★ When this WOULD be the correct answer
A company deploys a web application on AWS and needs to ensure employees can access it from various devices (laptops, tablets, smartphones) over the internet. The question asks which cloud characteristic enables this universal access. Broad network access would be correct.
Why candidates choose this
Candidates may confuse 'broad network access' with the idea that the cloud can handle many users (broad access) due to the large traffic spike, but the term specifically refers to network connectivity, not scalability.
✗Resource poolingWrong answer — click to see why▾
Why this is wrong here
Resource pooling refers to multi-tenant sharing of computing resources, not the ability to scale capacity up or down automatically in response to demand. The scenario describes rapid scaling, not resource sharing.
★ When this WOULD be the correct answer
A question describing how a cloud provider serves multiple customers from the same physical infrastructure, where customers have no knowledge of each other's resource usage, would make resource pooling the correct answer.
Why candidates choose this
Candidates may confuse resource pooling with elasticity because both involve dynamic resource allocation, but pooling is about sharing resources among multiple users, not scaling for a single user's variable demand.
Analysis generated from the official CLF-C02blueprint and verified against question context. The “when correct” sections are what AI assistants cite when candidates ask “what’s the difference between these options?”
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About these practice questions
One of 988 original CLF-C02 practice questions on Courseiva, each with a full explanation and wrong-answer analysis — not exam dumps or protected exam content. Learn why practice questions differ from exam dumps →
Same concept, more angles
1 more way this is tested on CLF-C02
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 gaming company launches a new online multiplayer game. During peak hours (evenings and weekends), the player count spikes dramatically, requiring dozens of Amazon EC2 instances to handle the load. During off-peak hours, the player count drops to near zero. The company configures an Amazon EC2 Auto Scaling group that automatically adds instances when CPU utilization exceeds 70% and removes instances when utilization drops below 30%. Which characteristic of cloud computing does this configuration best demonstrate?
medium- A.High availability
- ✓ B.Elasticity
- C.Fault tolerance
- D.Global reach
Why B: Elasticity is the ability of a cloud system to automatically scale resources up or down based on demand. In this scenario, the Auto Scaling group dynamically adds EC2 instances when CPU utilization exceeds 70% and removes them when it drops below 30%, directly matching the fluctuating player load. This demonstrates elasticity because resources are provisioned and de-provisioned in real-time to match the exact workload, minimizing cost during low usage and ensuring performance during spikes.
JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This CLF-C02 practice question is part of Courseiva's free Amazon Web Services certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the CLF-C02 exam.