- A
Elasticity
Correct. Elasticity is the ability to automatically scale computing resources up and down based on demand, which is exactly what the Auto Scaling group does during the traffic spike and subsequent drop.
- B
Scalability
Why wrong: Scalability is the ability to handle increased load by adding resources, but it does not inherently imply automatic scaling down. While the system is scalable, the key feature demonstrated is the dynamic, bidirectional adjustment that defines elasticity.
- C
High availability
Why wrong: High availability ensures the application remains accessible despite component failures, often through redundancy across multiple Availability Zones. The scenario does not describe a failure or redundancy configuration; it focuses on scaling to meet variable demand.
- D
Fault tolerance
Why wrong: Fault tolerance means the system can continue operating even when one or more components fail. The scenario does not mention any failures; it describes scaling in response to load changes, not fault events.
CLF-C02 Cloud Concepts Practice Question
This CLF-C02 practice question tests your understanding of cloud concepts. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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 retail company runs a web application on Amazon EC2 instances behind an Application Load Balancer. During a promotional event, traffic spikes to 10 times the normal level. The company configured an Amazon EC2 Auto Scaling group with a scaling policy that adds instances when CPU utilization exceeds 70% and removes instances when it drops below 30%. The application handles the spike without any manual intervention, and after the event ends, the number of instances automatically decreases to the original count, saving costs. This scenario best demonstrates which cloud computing concept?
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
Elasticity
The scenario describes the system automatically scaling out to 10 times the normal capacity during a traffic spike and then scaling back down when the spike ends, which is the definition of elasticity—the ability to dynamically provision and de-provision resources to match demand. The use of an EC2 Auto Scaling group with a CPU-based scaling policy (70% threshold to add, 30% to remove) directly demonstrates this cloud computing concept, as it handles variable workloads without manual intervention and optimizes cost by reducing resources when they are no longer needed.
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.
- ✓
Elasticity
Why this is correct
Correct. Elasticity is the ability to automatically scale computing resources up and down based on demand, which is exactly what the Auto Scaling group does during the traffic spike and subsequent drop.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Scalability
Why it's wrong here
Scalability is the ability to handle increased load by adding resources, but it does not inherently imply automatic scaling down. While the system is scalable, the key feature demonstrated is the dynamic, bidirectional adjustment that defines elasticity.
- ✗
High availability
Why it's wrong here
High availability ensures the application remains accessible despite component failures, often through redundancy across multiple Availability Zones. The scenario does not describe a failure or redundancy configuration; it focuses on scaling to meet variable demand.
- ✗
Fault tolerance
Why it's wrong here
Fault tolerance means the system can continue operating even when one or more components fail. The scenario does not mention any failures; it describes scaling in response to load changes, not fault events.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse scalability with elasticity, but scalability only implies the ability to grow (scale up/out), while elasticity explicitly includes the ability to shrink (scale down/in) to match demand and optimize costs.
Trap categories for this question
Scenario analysis trap
High availability ensures the application remains accessible despite component failures, often through redundancy across multiple Availability Zones. The scenario does not describe a failure or redundancy configuration; it focuses on scaling to meet variable demand.
Detailed technical explanation
How to think about this question
Under the hood, EC2 Auto Scaling uses a target tracking scaling policy that continuously monitors CloudWatch metrics (e.g., CPUUtilization) and calculates the desired capacity to maintain the target value (e.g., 70%). The scaling cooldown period (default 300 seconds) prevents rapid fluctuations, but during a spike, the policy can add multiple instances per evaluation cycle if the metric deviation is large. A real-world scenario where this matters is a flash sale: elasticity ensures you don't over-provision for peak (saving costs) while still handling the surge, whereas pure scalability might leave idle resources after the event.
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 startup's cloud architect reviews their monthly bill and notices costs are higher than expected for a long-running batch job. Switching from on-demand instances to Reserved Instances — or using Spot/Preemptible VMs — can reduce compute costs by up to 72 %. Questions like this test whether you understand the tradeoffs between commitment, flexibility, and cost across cloud pricing models.
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.
- →
Cloud Concepts — study guide chapter
Learn the concepts, then practise the questions
- →
Cloud Concepts practice questions
Targeted practice on this topic area only
- →
All CLF-C02 questions
1,024 questions across all exam domains
- →
AWS Certified Cloud Practitioner CLF-C02 study guide
Full concept coverage aligned to exam objectives
- →
CLF-C02 practice test guide
How to use practice tests most effectively before exam day
Related practice questions
Related CLF-C02 practice-question pages
Use these pages to review the topic behind this question. This is how one missed question becomes focused revision.
Cloud Concepts practice questions
Practise CLF-C02 questions linked to Cloud Concepts.
Security and Compliance practice questions
Practise CLF-C02 questions linked to Security and Compliance.
Cloud Technology and Services practice questions
Practise CLF-C02 questions linked to Cloud Technology and Services.
Billing, Pricing, and Support practice questions
Practise CLF-C02 questions linked to Billing, Pricing, and Support.
AWS shared responsibility model practice questions
Practise CLF-C02 questions linked to AWS shared responsibility model.
AWS IAM practice questions
Practise CLF-C02 questions linked to AWS IAM.
AWS pricing practice questions
Practise CLF-C02 questions linked to AWS pricing.
AWS support plans practice questions
Practise CLF-C02 questions linked to AWS support plans.
AWS S3 practice questions
Practise CLF-C02 questions linked to AWS S3.
AWS EC2 practice questions
Practise CLF-C02 questions linked to AWS EC2.
Practice this exam
Start a free CLF-C02 practice session
Short sessions build daily habit. Longer sessions build exam-day stamina. Try a timed session to simulate real conditions.
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: Elasticity — The scenario describes the system automatically scaling out to 10 times the normal capacity during a traffic spike and then scaling back down when the spike ends, which is the definition of elasticity—the ability to dynamically provision and de-provision resources to match demand. The use of an EC2 Auto Scaling group with a CPU-based scaling policy (70% threshold to add, 30% to remove) directly demonstrates this cloud computing concept, as it handles variable workloads without manual intervention and optimizes cost by reducing resources when they are no longer needed.
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
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
Keep practising
More CLF-C02 practice questions
- A company publishes a message each time a new product is added to its catalogue. Three services need to receive this mes…
- A media company stores frequently accessed video thumbnails in Amazon S3. The thumbnails are read multiple times every d…
- A company needs a service to translate domain names (like www.example.com) into IP addresses, check the health of their…
- A startup runs an application on AWS and receives a monthly bill that charges exactly for the number of compute hours us…
- A financial institution runs its core banking application on-premises due to regulatory requirements. It has connected i…
- A company wants to run a MySQL database in AWS without managing database software installation, applying patches, settin…
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.
Question Discussion
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
Sign in to join the discussion.