- A
AWS Elastic Load Balancing
Why wrong: Elastic Load Balancing distributes incoming traffic across multiple targets, such as EC2 instances, but it does not automatically launch new instances to replace failed ones. It can perform health checks and route traffic away from unhealthy instances, but replacement is not its function.
- B
Amazon EC2 Auto Scaling
Amazon EC2 Auto Scaling is the correct service. It automatically adds or removes EC2 instances based on defined policies or to maintain a desired capacity. If an instance fails, Auto Scaling detects the decrease in healthy capacity and launches a new instance to replace it, ensuring the application remains available.
- C
AWS Lambda
Why wrong: AWS Lambda is a serverless compute service that runs code in response to events, without provisioning or managing servers. It is not designed to manage EC2 instance lifecycles or automatically replace failed instances.
- D
AWS Auto Scaling
Why wrong: AWS Auto Scaling is a service that helps you scale multiple AWS resources, including EC2 instances, DynamoDB tables, and Aurora replicas, using scaling plans. However, the specific service that directly manages EC2 instance replacement and desired capacity is Amazon EC2 Auto Scaling. AWS Auto Scaling provides a unified interface for scaling across resources, but for the described scenario, Amazon EC2 Auto Scaling is the appropriate service.
CLF-C02 Cloud Technology and Services Practice Question
This CLF-C02 practice question tests your understanding of cloud technology and services. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. A key principle to apply: amazon EC2 Auto Scaling automatically adjusts EC2 instance count.. 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 multiple Amazon EC2 instances that are behind an Application Load Balancer. The operations team wants to ensure that if any EC2 instance fails, a new instance is automatically launched to replace it and maintain a minimum number of running instances. Which AWS service should the company use to meet this requirement?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue:
"minimum / minimize"Why it matters: Asks for the least resource use — fewest addresses, smallest subnet, lowest overhead. Eliminate over-provisioned options even if they would technically work.
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
Amazon EC2 Auto Scaling
Amazon EC2 Auto Scaling is the correct service because it automatically launches new EC2 instances to replace failed ones and maintains a specified minimum number of running instances. It integrates with the Application Load Balancer to register new instances and deregister failed ones, ensuring the web application remains available. This directly meets the requirement for automatic instance replacement and capacity maintenance.
Key principle: Amazon EC2 Auto Scaling automatically adjusts EC2 instance count.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
AWS Elastic Load Balancing
Why it's wrong here
Elastic Load Balancing distributes incoming traffic across multiple targets, such as EC2 instances, but it does not automatically launch new instances to replace failed ones. It can perform health checks and route traffic away from unhealthy instances, but replacement is not its function.
When this WOULD be correct
A company needs to distribute incoming web traffic across multiple EC2 instances to improve fault tolerance and availability, with no requirement for automatic instance replacement.
- ✓
Amazon EC2 Auto Scaling
Why this is correct
Amazon EC2 Auto Scaling is the correct service. It automatically adds or removes EC2 instances based on defined policies or to maintain a desired capacity. If an instance fails, Auto Scaling detects the decrease in healthy capacity and launches a new instance to replace it, ensuring the application remains available.
Clue confirmation
The clue word "minimum / minimize" in the question point toward this answer.
Related concept
Amazon EC2 Auto Scaling automatically adjusts EC2 instance count.
- ✗
AWS Lambda
Why it's wrong here
AWS Lambda is a serverless compute service that runs code in response to events, without provisioning or managing servers. It is not designed to manage EC2 instance lifecycles or automatically replace failed instances.
When this WOULD be correct
An exam scenario where the requirement is to automatically restart a stopped EC2 instance using a scheduled or event-driven function, such as using a Lambda function triggered by a CloudWatch alarm to start an instance that has stopped unexpectedly.
- ✗
AWS Auto Scaling
Why it's wrong here
AWS Auto Scaling is a service that helps you scale multiple AWS resources, including EC2 instances, DynamoDB tables, and Aurora replicas, using scaling plans. However, the specific service that directly manages EC2 instance replacement and desired capacity is Amazon EC2 Auto Scaling. AWS Auto Scaling provides a unified interface for scaling across resources, but for the described scenario, Amazon EC2 Auto Scaling is the appropriate service.
When this WOULD be correct
AWS Auto Scaling would be correct if the question asked about centrally managing scaling policies across multiple services, such as EC2 Auto Scaling, DynamoDB, and Aurora, or if the requirement was to create a scaling plan that coordinates scaling across different resources.
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.
✓Amazon EC2 Auto ScalingCorrect answer▾
Why this is correct
Amazon EC2 Auto Scaling is the correct service. It automatically adds or removes EC2 instances based on defined policies or to maintain a desired capacity. If an instance fails, Auto Scaling detects the decrease in healthy capacity and launches a new instance to replace it, ensuring the application remains available.
✗AWS Elastic Load BalancingWrong answer — click to see why▾
Why this is wrong here
AWS Elastic Load Balancing distributes incoming traffic across targets but does not automatically replace failed instances or manage instance counts.
★ When this WOULD be the correct answer
A company needs to distribute incoming web traffic across multiple EC2 instances to improve fault tolerance and availability, with no requirement for automatic instance replacement.
Why candidates choose this
Candidates may confuse the high availability provided by load balancing with the automatic recovery and scaling capabilities of Auto Scaling.
✗AWS LambdaWrong answer — click to see why▾
Why this is wrong here
AWS Lambda is a serverless compute service that runs code in response to events, not a service for automatically replacing failed EC2 instances to maintain a minimum count.
★ When this WOULD be the correct answer
An exam scenario where the requirement is to automatically restart a stopped EC2 instance using a scheduled or event-driven function, such as using a Lambda function triggered by a CloudWatch alarm to start an instance that has stopped unexpectedly.
Why candidates choose this
Candidates may confuse Lambda's ability to respond to events (like instance failure) with the capability to manage instance lifecycle, not realizing that EC2 Auto Scaling is the dedicated service for maintaining instance counts.
✗AWS Auto ScalingWrong answer — click to see why▾
Why this is wrong here
AWS Auto Scaling is a service that helps you set up scaling policies for multiple AWS services, but it does not directly manage EC2 instance replacement or maintain a minimum number of running instances. The requirement to automatically launch a new instance when one fails is specifically handled by Amazon EC2 Auto Scaling, which manages the EC2 instances themselves.
★ When this WOULD be the correct answer
AWS Auto Scaling would be correct if the question asked about centrally managing scaling policies across multiple services, such as EC2 Auto Scaling, DynamoDB, and Aurora, or if the requirement was to create a scaling plan that coordinates scaling across different resources.
Why candidates choose this
Candidates may confuse AWS Auto Scaling with Amazon EC2 Auto Scaling due to the similar names, and assume that 'AWS Auto Scaling' is the service that handles EC2 instance scaling, when in fact it is a higher-level service for managing scaling across multiple AWS resources.
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 confusing Amazon EC2 Auto Scaling (which directly manages EC2 instance lifecycle and replacement) with AWS Auto Scaling (a broader service for scaling multiple resources), leading candidates to pick D instead of B.
Trap categories for this question
Scenario analysis trap
AWS Auto Scaling is a service that helps you scale multiple AWS resources, including EC2 instances, DynamoDB tables, and Aurora replicas, using scaling plans. However, the specific service that directly manages EC2 instance replacement and desired capacity is Amazon EC2 Auto Scaling. AWS Auto Scaling provides a unified interface for scaling across resources, but for the described scenario, Amazon EC2 Auto Scaling is the appropriate service.
Detailed technical explanation
How to think about this question
Amazon EC2 Auto Scaling uses launch templates or configurations to define instance specifications and integrates with health checks from the Application Load Balancer or EC2 status checks to detect failures. When an instance fails, the Auto Scaling group automatically triggers a replacement by launching a new instance, respecting the minimum, maximum, and desired capacity settings. This process involves the Auto Scaling group's cooldown period and lifecycle hooks to ensure smooth transitions, such as draining connections from the failed instance before termination.
KKey Concepts to Remember
- Amazon EC2 Auto Scaling automatically adjusts EC2 instance count.
- It replaces unhealthy or terminated EC2 instances to maintain desired capacity.
- EC2 Auto Scaling uses launch templates/configurations to provision new instances.
- It integrates with Elastic Load Balancing for health checks and traffic distribution.
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
Amazon EC2 Auto Scaling automatically adjusts EC2 instance count.
Real-world example
How this comes up in practice
A cloud solutions architect for a retail company is evaluating services for a new workload. The correct answer here reflects best practice for the specific scenario described — not a general cloud recommendation. Amazon EC2 Auto Scaling automatically adjusts EC2 instance count. Cloud exam questions reward reading the constraint carefully: the same technology can be right or wrong depending on the use case.
What to study next
Got this wrong? Here's your next step.
Review amazon EC2 Auto Scaling automatically adjusts EC2 instance count., then practise related CLF-C02 questions on the same topic to reinforce the concept.
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FAQ
Questions learners often ask
What does this CLF-C02 question test?
Cloud Technology and Services — This question tests Cloud Technology and Services — Amazon EC2 Auto Scaling automatically adjusts EC2 instance count..
What is the correct answer to this question?
The correct answer is: Amazon EC2 Auto Scaling — Amazon EC2 Auto Scaling is the correct service because it automatically launches new EC2 instances to replace failed ones and maintains a specified minimum number of running instances. It integrates with the Application Load Balancer to register new instances and deregister failed ones, ensuring the web application remains available. This directly meets the requirement for automatic instance replacement and capacity maintenance.
What should I do if I get this CLF-C02 question wrong?
Review amazon EC2 Auto Scaling automatically adjusts EC2 instance count., then practise related CLF-C02 questions on the same topic to reinforce the concept.
Are there clue words in this question I should notice?
Yes — watch for: "minimum / minimize". Asks for the least resource use — fewest addresses, smallest subnet, lowest overhead. Eliminate over-provisioned options even if they would technically work.
What is the key concept behind this question?
Amazon EC2 Auto Scaling automatically adjusts EC2 instance count.
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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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