- A
Elasticity
Why wrong: Elasticity refers to the ability to automatically scale resources up or down based on demand. While the scenario may involve scaling, the specific action of changing to a larger instance type is vertical scaling, not the automated characteristic of elasticity.
- B
High availability
Why wrong: High availability ensures that an application remains operational even if individual components fail. This scenario describes changing the size of a single instance, which does not inherently improve availability; in fact, a single larger instance can be a single point of failure.
- C
Vertical scaling
Vertical scaling (scaling up) increases the capacity of an existing resource—in this case, upgrading the EC2 instance to a larger type with more CPU and memory. This is correct for approach (1).
- D
Horizontal scaling
Why wrong: Horizontal scaling (scaling out) adds more instances to distribute the workload, which is exactly approach (2). The question asks about approach (1), so this is incorrect.
Quick Answer
The answer is vertical scaling. Approach (1) represents vertical scaling, also known as scaling up, because it increases the capacity of a single Amazon EC2 instance by moving to a larger instance type with more CPU and memory, rather than adding more instances. This is the core distinction between vertical and horizontal scaling in cloud computing: vertical scaling enhances the power of one resource, while horizontal scaling adds more resources to distribute the load. On the AWS Certified Cloud Practitioner CLF-C02 exam, this concept frequently appears in scenario-based questions testing your ability to differentiate between scaling strategies—a common trap is confusing vertical scaling with adding instances behind a load balancer, which is horizontal scaling. Remember the memory tip: think of vertical scaling as "making the server taller" by adding more power to a single machine, whereas horizontal scaling makes the system "wider" by adding more machines.
CLF-C02 Cloud Concepts Practice Question
This CLF-C02 practice question tests your understanding of cloud concepts. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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 a web application on a single Amazon EC2 instance. As the application gains popularity, the instance frequently reaches 100% CPU utilization during peak hours, causing slow response times. The operations team is evaluating two approaches: (1) migrate the application to a larger EC2 instance type with more CPU and memory, or (2) add multiple smaller EC2 instances behind a load balancer and distribute the traffic. Which cloud computing concept does approach (1) represent?
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
Vertical scaling
Approach (1) involves moving the application to a larger EC2 instance type with more CPU and memory, which is the definition of vertical scaling (scaling up). This increases the capacity of a single resource rather than adding more instances.
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 it's wrong here
Elasticity refers to the ability to automatically scale resources up or down based on demand. While the scenario may involve scaling, the specific action of changing to a larger instance type is vertical scaling, not the automated characteristic of elasticity.
- ✗
High availability
Why it's wrong here
High availability ensures that an application remains operational even if individual components fail. This scenario describes changing the size of a single instance, which does not inherently improve availability; in fact, a single larger instance can be a single point of failure.
- ✓
Vertical scaling
Why this is correct
Vertical scaling (scaling up) increases the capacity of an existing resource—in this case, upgrading the EC2 instance to a larger type with more CPU and memory. This is correct for approach (1).
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Horizontal scaling
Why it's wrong here
Horizontal scaling (scaling out) adds more instances to distribute the workload, which is exactly approach (2). The question asks about approach (1), so this is incorrect.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse vertical scaling with elasticity, but elasticity specifically refers to the dynamic, automated adjustment of resources (both up and down) to match demand, not a manual one-time upgrade to a larger instance.
Trap categories for this question
Scenario analysis trap
Elasticity refers to the ability to automatically scale resources up or down based on demand. While the scenario may involve scaling, the specific action of changing to a larger instance type is vertical scaling, not the automated characteristic of elasticity.
Detailed technical explanation
How to think about this question
Vertical scaling in AWS EC2 involves stopping the instance, changing the instance type (e.g., from t2.micro to m5.large), and restarting it, which directly increases vCPUs and memory. However, this approach has a hard limit based on the maximum instance size available for that family, and it introduces downtime during the resize operation. In contrast, horizontal scaling with a load balancer like ALB distributes traffic across multiple instances, improving fault tolerance and allowing near-infinite scaling, but requires the application to be stateless or use a shared session store.
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.
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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: Vertical scaling — Approach (1) involves moving the application to a larger EC2 instance type with more CPU and memory, which is the definition of vertical scaling (scaling up). This increases the capacity of a single resource rather than adding more instances.
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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