← CLF-C02·Amazon Web Services

Question 345 of 1,024

Cloud Technology and Services →mediumMultiple ChoiceObjective-mapped

Quick Answer

AWS Lambda is the correct choice because it provides a serverless compute service perfectly suited for asynchronous background processing tasks like image resizing and thumbnail generation after uploads. The key technical concept here is event-driven architecture: when a user uploads an image to Amazon S3, that event can automatically trigger a Lambda function to run the background processing, while the frontend immediately returns a response to the user, achieving full decoupling. On the AWS Certified Cloud Practitioner CLF-C02 exam, this scenario tests your understanding of serverless compute and event-driven integration, often appearing as a comparison against EC2 (which requires server management) or AWS Batch (better for longer, batch-oriented jobs). A common trap is choosing EC2 because it can run custom code, but Lambda’s automatic scaling and zero server management make it the clear winner for short-lived, event-triggered tasks. Memory tip: think “Lambda for light, event-driven lifting” — if the task fits within 15 minutes and responds to an event, Lambda is the serverless answer.

CLF-C02 Cloud Technology and Services Practice Question

This CLF-C02 practice question tests your understanding of cloud technology and services. 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 a web application that allows users to upload images. After each upload, the application must perform several background processing tasks (e.g., resizing, generating thumbnails) that take up to 30 seconds each. Users should receive an immediate response and the processing should continue asynchronously. The company wants a solution that scales automatically with the number of uploads and requires no server management. Which AWS service should the company use to run these background processing tasks?

Question 1mediummultiple choice

Full question →

A
AWS Lambda
Correct. AWS Lambda is a serverless compute service that runs code in response to events like an S3 upload. It scales automatically, requires no server management, and supports execution times up to 15 minutes, easily covering the 30-second tasks.
B
Amazon EC2 with Auto Scaling
Why wrong: Incorrect. Amazon EC2 requires you to manage the underlying instances (e.g., patching, scaling policies) and is more complex for simple event-driven tasks. While Auto Scaling can handle load, it is not as cost-effective or straightforward as Lambda for this scenario.
C
Amazon ECS with AWS Fargate
Why wrong: Incorrect. Amazon ECS with Fargate is a container orchestration service. It can run background tasks, but it requires creating Docker images, defining task definitions, and managing clusters. This adds unnecessary overhead compared to Lambda for short, event-driven processing.
D
AWS Batch
Why wrong: Incorrect. AWS Batch is designed for batch computing jobs that often run on a schedule or in large volumes. It requires defining job definitions and compute environments. While it could process images, it is not the simplest or most event-driven solution for this use case.

Full breakdown with real-world context →

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

✓

AWS Lambda

AWS Lambda is the correct choice because it is a serverless compute service that executes code in response to events, such as an image upload to Amazon S3. It scales automatically with the number of uploads, requires no server management, and can run background tasks like resizing and thumbnail generation within its 15-minute maximum execution time, easily accommodating the 30-second processing requirement. Users receive an immediate response because the upload triggers Lambda asynchronously, decoupling the frontend from the processing.

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.

✓
AWS Lambda
Why this is correct
Correct. AWS Lambda is a serverless compute service that runs code in response to events like an S3 upload. It scales automatically, requires no server management, and supports execution times up to 15 minutes, easily covering the 30-second tasks.
Related concept
Read the scenario before looking for a memorised answer.
✗
Amazon EC2 with Auto Scaling
Why it's wrong here
Incorrect. Amazon EC2 requires you to manage the underlying instances (e.g., patching, scaling policies) and is more complex for simple event-driven tasks. While Auto Scaling can handle load, it is not as cost-effective or straightforward as Lambda for this scenario.
✗
Amazon ECS with AWS Fargate
Why it's wrong here
Incorrect. Amazon ECS with Fargate is a container orchestration service. It can run background tasks, but it requires creating Docker images, defining task definitions, and managing clusters. This adds unnecessary overhead compared to Lambda for short, event-driven processing.
✗
AWS Batch
Why it's wrong here
Incorrect. AWS Batch is designed for batch computing jobs that often run on a schedule or in large volumes. It requires defining job definitions and compute environments. While it could process images, it is not the simplest or most event-driven solution for this use case.

Common exam traps

Common exam trap: answer the scenario, not the keyword

The trap here is that candidates may choose Amazon ECS with AWS Fargate because they think containerization is required for complex processing, but Lambda is simpler, cheaper, and more appropriate for short-lived, event-driven tasks that fit within its execution limits.

Trap categories for this question

Scenario analysis trap
Incorrect. Amazon EC2 requires you to manage the underlying instances (e.g., patching, scaling policies) and is more complex for simple event-driven tasks. While Auto Scaling can handle load, it is not as cost-effective or straightforward as Lambda for this scenario.

Detailed technical explanation

How to think about this question

AWS Lambda supports a maximum execution timeout of 15 minutes (900 seconds), which comfortably covers the 30-second processing tasks. Under the hood, Lambda uses a Firecracker microVM for isolation, enabling rapid scaling from zero to thousands of concurrent executions. In a real-world scenario, an S3 event notification can directly invoke a Lambda function, passing the object key and bucket name, allowing the function to download, process, and re-upload the image without any intermediate infrastructure.

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 media company stores terabytes of video archives that are accessed once a year for audit purposes. Moving these objects to a cold storage tier (Azure Archive, S3 Glacier, or Google Nearline) costs a fraction of hot storage. Questions like this test whether you understand storage tiers, access frequency tradeoffs, and retrieval latency requirements.

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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FAQ

Questions learners often ask

What does this CLF-C02 question test?

Cloud Technology and Services — This question tests Cloud Technology and Services — Read the scenario before looking for a memorised answer..

What is the correct answer to this question?

The correct answer is: AWS Lambda — AWS Lambda is the correct choice because it is a serverless compute service that executes code in response to events, such as an image upload to Amazon S3. It scales automatically with the number of uploads, requires no server management, and can run background tasks like resizing and thumbnail generation within its 15-minute maximum execution time, easily accommodating the 30-second processing requirement. Users receive an immediate response because the upload triggers Lambda asynchronously, decoupling the frontend from the processing.

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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Same concept, more angles

2 more ways this is tested on CLF-C02

These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.

Variation 1. A company has a mobile application that allows users to upload profile photos. When a new photo is uploaded to an Amazon S3 bucket, the application must automatically create a thumbnail version and store it in another S3 bucket. The company wants a solution that runs only when needed, scales automatically, and requires no management of underlying servers. Which AWS service should the company use to meet these requirements?

medium

✓ A.AWS Lambda
B.AWS Batch
C.Amazon EC2
D.Amazon ECS with EC2 launch type

Why A: AWS Lambda is the correct choice because it is a serverless compute service that runs code in response to events, such as an S3 PUT object event. It automatically scales from zero to thousands of concurrent executions based on the number of incoming uploads, and requires no server management, perfectly meeting the requirement for an on-demand, auto-scaling thumbnail generation solution.

Variation 2. Which AWS compute service allows developers to run code in response to HTTP requests without managing servers, using a simple programming model based on functions?

easy

A.Amazon EC2
✓ B.AWS Lambda
C.Amazon ECS
D.AWS Fargate

Why B: AWS Lambda is the correct answer because it is a serverless compute service that executes code in response to events such as HTTP requests via Amazon API Gateway. Developers upload functions and Lambda automatically scales and manages the underlying infrastructure, aligning with the question's requirement of running code without managing servers using a function-based model.

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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.