CLF-C02 Cloud Concepts Practice Question
A company runs a web application on Amazon EC2 instances. The application experiences unpredictable traffic spikes during marketing campaigns. The company configures an Amazon EC2 Auto Scaling group to automatically add instances when CPU utilization exceeds 70% and remove instances when it drops below 30%. This allows the company to handle peak loads without manual intervention and avoid paying for idle capacity during low traffic periods. Which essential characteristic of cloud computing does this configuration BEST demonstrate?
⚠ Common exam trap
Test-takers frequently confuse rapid elasticity with on-demand self-service, but on-demand self-service is about the ability to provision resources without human interaction, while rapid elasticity is about automatically scaling resources up or down to match demand in near real-time.
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 Auto Scaling group dynamically adjusts the number of EC2 instances in response to CPU utilization thresholds, scaling out during traffic spikes and scaling in during low traffic. This ability to rapidly provision and release compute resources to match demand is the defining characteristic of rapid elasticity, which allows the company to handle peak loads without manual intervention and avoid paying for idle capacity.
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 provider. While the company can initially configure the Auto Scaling group via the AWS Management Console or API, the scenario focuses on the automatic scaling behavior itself, not the self-service provisioning.
When this WOULD be correct
A scenario where a user can provision an EC2 instance through the AWS Management Console without needing to contact AWS support would demonstrate on-demand self-service. For example, a developer launching an instance for a test environment without manual approval.
- ✗
Broad network access
Why it's wrong here
Broad network access means that resources are accessible over the network by a wide range of client devices (e.g., laptops, phones). The scenario does not mention device diversity or network accessibility as the key benefit.
When this WOULD be correct
A question describing a company that needs to ensure its cloud resources are accessible from various devices (e.g., laptops, smartphones, tablets) over the internet using standard protocols would make broad network access the correct answer.
- ✓
Rapid elasticity
Why this is correct
Rapid elasticity is the ability to quickly and automatically scale computing resources up or down to match demand. The Auto Scaling group adding and removing EC2 instances based on CPU thresholds is a direct example of this characteristic.
- ✗
Measured service
Why it's wrong here
Measured service means that cloud resource usage is metered and billed on a pay-as-you-go basis. While the company benefits from paying only for the capacity used, the scenario primarily highlights the automatic scaling capability, not the metering or billing aspect.
When this WOULD be correct
A company uses AWS to deploy a web application and wants to track and report resource consumption for cost allocation across departments. The cloud provider offers detailed usage metrics and billing per hour or per GB. This demonstrates measured service.
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 computing resources up or down to match demand. The Auto Scaling group adding and removing EC2 instances based on CPU thresholds is a direct example of this characteristic.
✗On-demand self-serviceWrong answer — click to see why▾
Why this is wrong here
On-demand self-service refers to the ability to provision computing resources without human interaction, but the question focuses on automatically scaling resources up and down based on demand, which is rapid elasticity, not the provisioning method.
★ When this WOULD be the correct answer
A scenario where a user can provision an EC2 instance through the AWS Management Console without needing to contact AWS support would demonstrate on-demand self-service. For example, a developer launching an instance for a test environment without manual approval.
Why candidates choose this
Candidates may confuse the ability to automatically scale (elasticity) with the ability to provision resources on demand, as both involve responding to user needs without manual intervention.
✗Broad network accessWrong answer — click to see why▾
Why this is wrong here
Broad network access refers to the ability to access resources over the network via standard protocols, not to automatically scaling resources based on demand. The scenario focuses on dynamic scaling, not network accessibility.
★ When this WOULD be the correct answer
A question describing a company that needs to ensure its cloud resources are accessible from various devices (e.g., laptops, smartphones, tablets) over the internet using standard protocols would make broad network access the correct answer.
Why candidates choose this
Candidates may confuse the concept of accessing cloud services over a network with the ability to scale resources, as both involve network connectivity and cloud capabilities.
✗Measured serviceWrong answer — click to see why▾
Why this is wrong here
Measured service refers to the metering and billing of cloud resources based on usage, such as pay-per-hour or per-GB. The scenario describes automatic scaling to handle traffic spikes, which is about rapid elasticity, not about tracking or charging for usage.
★ When this WOULD be the correct answer
A company uses AWS to deploy a web application and wants to track and report resource consumption for cost allocation across departments. The cloud provider offers detailed usage metrics and billing per hour or per GB. This demonstrates measured service.
Why candidates choose this
Candidates may confuse the automatic scaling (which involves adding/removing resources) with the idea of paying only for what you use, which is a characteristic of measured service. However, measured service is about metering and billing, not about dynamic resource adjustment.
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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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.