- A
Elasticity
Correct. Elasticity is the ability to automatically scale resources up or down to match demand. The Auto Scaling group adjusts the number of EC2 instances based on CPU utilization, which is a clear example of elasticity.
- B
High availability
Why wrong: Incorrect. High availability focuses on ensuring that the application remains operational despite failures (e.g., by distributing instances across multiple Availability Zones). The scenario emphasizes scaling to meet demand, not surviving failures.
- C
Fault tolerance
Why wrong: Incorrect. Fault tolerance means the system can continue operating without interruption even when a component fails, often through redundant components. The described setup is about scaling based on load, not about handling component failures.
- D
Durability
Why wrong: Incorrect. Durability refers to the long-term preservation of data, ensuring it is not lost or corrupted. This scenario involves compute resource scaling, not data persistence.
Elasticity in Cloud Computing
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 company runs an e-commerce website on Amazon EC2 instances. The website experiences unpredictable traffic spikes during flash sales and returns to normal traffic levels afterward. To handle this, the company configures an Auto Scaling group that adds EC2 instances when the average CPU utilization exceeds 70% and removes instances when it drops below 30%. Which essential characteristic of cloud computing does this configuration primarily demonstrate?
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
This configuration demonstrates elasticity because it automatically scales EC2 instances up during flash sales (when CPU exceeds 70%) and scales them down when traffic normalizes (CPU below 30%). Elasticity is the ability to dynamically provision and de-provision resources to match demand, which is exactly what Auto Scaling groups with CPU utilization thresholds achieve.
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 resources up or down to match demand. The Auto Scaling group adjusts the number of EC2 instances based on CPU utilization, which is a clear example of elasticity.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
High availability
Why it's wrong here
Incorrect. High availability focuses on ensuring that the application remains operational despite failures (e.g., by distributing instances across multiple Availability Zones). The scenario emphasizes scaling to meet demand, not surviving failures.
When this WOULD be correct
A question that asks: 'A company deploys a web application across multiple Availability Zones with an Application Load Balancer and Auto Scaling group to maintain service even if an entire AZ fails. Which cloud characteristic does this demonstrate?' would have high availability as the correct answer.
- ✗
Fault tolerance
Why it's wrong here
Incorrect. Fault tolerance means the system can continue operating without interruption even when a component fails, often through redundant components. The described setup is about scaling based on load, not about handling component failures.
When this WOULD be correct
An exam question might ask: 'A company runs a critical application on multiple EC2 instances across Availability Zones. If one instance fails, the application continues running without downtime. Which cloud characteristic does this demonstrate?' The answer would be fault tolerance.
- ✗
Durability
Why it's wrong here
Incorrect. Durability refers to the long-term preservation of data, ensuring it is not lost or corrupted. This scenario involves compute resource scaling, not data persistence.
When this WOULD be correct
A question asking: 'Which cloud characteristic ensures that data remains intact and accessible even after hardware failures?' would make durability the correct answer, especially when discussing S3's 99.999999999% durability or EBS snapshots.
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.
✓ElasticityCorrect answer▾
Why this is correct
Correct. Elasticity is the ability to automatically scale resources up or down to match demand. The Auto Scaling group adjusts the number of EC2 instances based on CPU utilization, which is a clear example of elasticity.
✗High availabilityWrong answer — click to see why▾
Why this is wrong here
High availability focuses on ensuring system uptime and resilience through redundancy, not on dynamically scaling resources up and down based on demand. The question describes scaling in response to traffic spikes, which is elasticity.
★ When this WOULD be the correct answer
A question that asks: 'A company deploys a web application across multiple Availability Zones with an Application Load Balancer and Auto Scaling group to maintain service even if an entire AZ fails. Which cloud characteristic does this demonstrate?' would have high availability as the correct answer.
Why candidates choose this
Candidates may confuse elasticity with high availability because both involve Auto Scaling groups, but high availability is about fault tolerance and uptime, not dynamic scaling based on load.
✗Fault toleranceWrong answer — click to see why▾
Why this is wrong here
Fault tolerance refers to a system's ability to continue operating without interruption when one or more components fail, not to scaling resources in response to demand changes. The question describes scaling based on CPU utilization, not handling failures.
★ When this WOULD be the correct answer
An exam question might ask: 'A company runs a critical application on multiple EC2 instances across Availability Zones. If one instance fails, the application continues running without downtime. Which cloud characteristic does this demonstrate?' The answer would be fault tolerance.
Why candidates choose this
Candidates may confuse fault tolerance with elasticity because both involve multiple instances, but fault tolerance is about surviving failures, not scaling to meet load.
✗DurabilityWrong answer — click to see why▾
Why this is wrong here
Durability refers to the ability to retain data over the long term without loss, typically in storage systems like S3 or EBS. This question focuses on scaling compute resources in response to demand, not data persistence.
★ When this WOULD be the correct answer
A question asking: 'Which cloud characteristic ensures that data remains intact and accessible even after hardware failures?' would make durability the correct answer, especially when discussing S3's 99.999999999% durability or EBS snapshots.
Why candidates choose this
Candidates may confuse durability with reliability or assume it covers all forms of data protection, including the ability to handle traffic spikes, due to overlapping terminology in cloud concepts.
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?”
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse elasticity with high availability or fault tolerance, but the question specifically tests the ability to match resource capacity to fluctuating demand, which is elasticity, not the ability to withstand failures or remain operational.
Trap categories for this question
Scenario analysis trap
Incorrect. High availability focuses on ensuring that the application remains operational despite failures (e.g., by distributing instances across multiple Availability Zones). The scenario emphasizes scaling to meet demand, not surviving failures.
Detailed technical explanation
How to think about this question
Under the hood, the Auto Scaling group uses a target tracking scaling policy based on the Average CPUUtilization metric from Amazon CloudWatch. When the metric breaches the 70% threshold, the policy triggers a scale-out event by launching new EC2 instances from a launch template or configuration. Conversely, when CPU drops below 30%, a scale-in event terminates instances. This dynamic adjustment is the hallmark of elasticity, which is a fundamental characteristic of cloud computing (often contrasted with scalability, which can be manual or planned).
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
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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 — This configuration demonstrates elasticity because it automatically scales EC2 instances up during flash sales (when CPU exceeds 70%) and scales them down when traffic normalizes (CPU below 30%). Elasticity is the ability to dynamically provision and de-provision resources to match demand, which is exactly what Auto Scaling groups with CPU utilization thresholds achieve.
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.
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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