- A
High availability
Why wrong: High availability focuses on ensuring systems remain operational, typically through redundancy and failover. While important, it does not directly address automatically adjusting capacity to match variable demand.
- B
Elasticity
Correct. Elasticity refers to the ability to dynamically provision and de-provision resources to match workload changes. This scenario describes exactly that: automatically increasing instances during spikes and decreasing them during low traffic to optimize cost and performance.
- C
Fault tolerance
Why wrong: Fault tolerance enables a system to continue operating, possibly with reduced functionality, when one or more components fail. It does not involve scaling resources to handle changes in demand.
- D
Durability
Why wrong: Durability refers to the assurance that data will not be lost or corrupted, typically achieved through replication and backups. It is unrelated to adjusting compute capacity in response to traffic patterns.
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 runs an e-commerce application on AWS that experiences unpredictable traffic spikes during flash sales. The application currently runs on a fixed number of Amazon EC2 instances, which leads to performance degradation during spikes and wasted capacity during low traffic. The company wants to automatically adjust the number of instances based on real-time demand, only paying for the resources it uses. This need best represents 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
Option B (Elasticity) is correct because the scenario describes automatically scaling EC2 instances up and down based on real-time demand, which is the definition of elasticity in cloud computing. AWS Auto Scaling and Amazon EC2 Auto Scaling groups enable this by adding or removing instances in response to CloudWatch metrics, ensuring the application only pays for resources consumed during traffic spikes and low traffic periods.
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.
- ✗
High availability
Why it's wrong here
High availability focuses on ensuring systems remain operational, typically through redundancy and failover. While important, it does not directly address automatically adjusting capacity to match variable demand.
- ✓
Elasticity
Why this is correct
Correct. Elasticity refers to the ability to dynamically provision and de-provision resources to match workload changes. This scenario describes exactly that: automatically increasing instances during spikes and decreasing them during low traffic to optimize cost and performance.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Fault tolerance
Why it's wrong here
Fault tolerance enables a system to continue operating, possibly with reduced functionality, when one or more components fail. It does not involve scaling resources to handle changes in demand.
- ✗
Durability
Why it's wrong here
Durability refers to the assurance that data will not be lost or corrupted, typically achieved through replication and backups. It is unrelated to adjusting compute capacity in response to traffic patterns.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse elasticity with high availability, thinking that adding more instances automatically ensures uptime, but elasticity is specifically about dynamic scaling to match demand, not about redundancy or failure recovery.
Detailed technical explanation
How to think about this question
Elasticity in AWS is implemented via Auto Scaling groups that use launch templates or configurations to define instance types, AMIs, and scaling policies (e.g., target tracking, step scaling). Under the hood, the AWS Auto Scaling service polls CloudWatch metrics like CPUUtilization or RequestCountPerTarget every minute and triggers scale-out or scale-in events, respecting cooldown periods to avoid thrashing. A real-world scenario is a flash sale where the group might scale from 5 to 500 instances in minutes, then scale back down, ensuring cost efficiency without manual intervention.
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
An e-commerce site experiences heavy traffic on Black Friday and near-zero traffic during off-peak weeks. Rather than provisioning permanent large VMs, the team uses auto-scaling groups that add capacity automatically under load and reduce it overnight. Questions like this test whether you understand elasticity, availability zones, and cloud compute scaling patterns.
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: Elasticity — Option B (Elasticity) is correct because the scenario describes automatically scaling EC2 instances up and down based on real-time demand, which is the definition of elasticity in cloud computing. AWS Auto Scaling and Amazon EC2 Auto Scaling groups enable this by adding or removing instances in response to CloudWatch metrics, ensuring the application only pays for resources consumed during traffic spikes and low traffic periods.
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.
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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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