- A
Rapid elasticity and measured service
Correct. Rapid elasticity allows automatic scaling of resources in response to demand changes, as shown by adding and removing instances. Measured service means the provider meters usage and charges only for consumed resources – the company pays only for actual compute capacity.
- B
On-demand self-service and broad network access
Why wrong: Incorrect. While on-demand self-service (provisioning without human interaction) is present in the scenario, it is not the primary focus. Broad network access refers to resources accessible over the network via standard protocols, which is also true but not the key characteristic demonstrated.
- C
Resource pooling and high availability
Why wrong: Incorrect. Resource pooling means the provider's physical resources are shared among multiple customers, which is not highlighted here. High availability refers to system uptime and fault tolerance, not scaling or pay-per-use.
- D
Fault tolerance and disaster recovery
Why wrong: Incorrect. Fault tolerance and disaster recovery are design principles for resilience against failures. The scenario does not describe any failure event or recovery process; it focuses on scaling and cost alignment.
CLF-C02 Cloud Concepts Practice Question
This CLF-C02 practice question tests your understanding of cloud concepts. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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 operates a seasonal e-commerce website. During holiday sales, traffic can increase by 500% within minutes. The company uses AWS Auto Scaling to automatically add Amazon EC2 instances when CPU utilization exceeds a threshold and remove instances during off-peak hours. The company pays only for the compute capacity it actually consumes, with no upfront commitment. This scenario best demonstrates which essential characteristics of cloud computing?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue:
"best"Why it matters: Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
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 and measured service
The scenario demonstrates rapid elasticity because the Auto Scaling group can instantly add hundreds of EC2 instances to handle a 500% traffic surge, and then remove them when demand drops. It also demonstrates measured service because the company pays only for the compute capacity actually consumed, with no upfront commitment, which is metered and billed based on usage.
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 and measured service
Why this is correct
Correct. Rapid elasticity allows automatic scaling of resources in response to demand changes, as shown by adding and removing instances. Measured service means the provider meters usage and charges only for consumed resources – the company pays only for actual compute capacity.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
On-demand self-service and broad network access
Why it's wrong here
Incorrect. While on-demand self-service (provisioning without human interaction) is present in the scenario, it is not the primary focus. Broad network access refers to resources accessible over the network via standard protocols, which is also true but not the key characteristic demonstrated.
- ✗
Resource pooling and high availability
Why it's wrong here
Incorrect. Resource pooling means the provider's physical resources are shared among multiple customers, which is not highlighted here. High availability refers to system uptime and fault tolerance, not scaling or pay-per-use.
- ✗
Fault tolerance and disaster recovery
Why it's wrong here
Incorrect. Fault tolerance and disaster recovery are design principles for resilience against failures. The scenario does not describe any failure event or recovery process; it focuses on scaling and cost alignment.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse 'rapid elasticity' with 'high availability' or 'fault tolerance,' because both involve adding resources, but elasticity specifically refers to scaling up/down based on demand, not maintaining uptime during failures.
Trap categories for this question
Scenario analysis trap
Incorrect. While on-demand self-service (provisioning without human interaction) is present in the scenario, it is not the primary focus. Broad network access refers to resources accessible over the network via standard protocols, which is also true but not the key characteristic demonstrated.
Detailed technical explanation
How to think about this question
Under the hood, AWS Auto Scaling uses CloudWatch alarms to trigger scaling policies based on metrics like CPUUtilization, and the EC2 instances are launched from pre-configured AMIs with lifecycle hooks for warm-up. A subtle behavior is that rapid elasticity is not instantaneous—there is a spin-up delay (often 2–5 minutes for Linux instances), so pre-warming with scheduled scaling or predictive scaling is often used for predictable spikes like holiday sales. In a real-world scenario, a company might combine target tracking scaling policies with a cooldown period to avoid thrashing during rapid traffic fluctuations.
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 company's IT admin needs to give a contractor read-only access to production logs without sharing account credentials. Using role-based access control (RBAC) and temporary scoped permissions — not a permanent shared password — is the correct pattern. Questions like this test whether you can apply least-privilege access across cloud identity services.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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Cloud Concepts — study guide chapter
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FAQ
Questions learners often ask
What does this CLF-C02 question test?
Cloud Concepts — This question tests 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 and measured service — The scenario demonstrates rapid elasticity because the Auto Scaling group can instantly add hundreds of EC2 instances to handle a 500% traffic surge, and then remove them when demand drops. It also demonstrates measured service because the company pays only for the compute capacity actually consumed, with no upfront commitment, which is metered and billed based on usage.
What should I do if I get this CLF-C02 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Are there clue words in this question I should notice?
Yes — watch for: "best". Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
About these practice questions
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Last reviewed: Jun 11, 2026
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.
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