- A
Amazon EC2 Auto Scaling group
Why wrong: EC2 Auto Scaling groups manage the number of EC2 instances, but they require ongoing server management and are not inherently event-driven to respond to individual image uploads. Using EC2 for this task would involve unnecessary overhead and cost.
- B
AWS Lambda
AWS Lambda is a serverless compute service that runs code in response to triggers, such as an S3 upload event. It scales automatically and charges only for execution duration, making it perfect for short-lived, sporadic image processing tasks.
- C
Amazon ECS with Fargate launch type
Why wrong: While Amazon ECS with Fargate is serverless and can run containers, it is not as straightforward or cost-effective for simple, event-driven image resizing. ECS is more suited for long-running or batch container workloads, not for instantly responding to individual events.
- D
AWS Elastic Beanstalk
Why wrong: Elastic Beanstalk is a platform as a service (PaaS) that automates the deployment and scaling of applications on managed servers. It requires a continuously running application environment and is not designed to execute code only in response to specific events like image uploads.
Quick Answer
The answer is AWS Lambda. This is the correct choice because Lambda is a serverless compute service designed for event-driven image processing, executing code only when triggered by an event like an image upload to Amazon S3. It automatically scales from zero to thousands of concurrent executions, perfectly matching the requirement to avoid managing servers and to process images only when a new upload occurs. On the AWS Certified Cloud Practitioner CLF-C02 exam, this scenario tests your understanding of serverless compute versus container or instance-based services; a common trap is choosing Amazon EC2 or Elastic Beanstalk, which require ongoing server management. Remember the key phrase: “event-driven, no servers” points directly to Lambda. For a memory tip, think “Lambda triggers on upload, scales like a flood.”
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 has a web application that processes user-uploaded images. When a user uploads an image, the application needs to resize the image into multiple formats (thumbnail, medium, large). The company wants to avoid managing servers and wants the image processing to execute only when a new image is uploaded. The solution must automatically scale to handle thousands of concurrent uploads. Which AWS service should the company use to perform the image processing?
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 runs code in response to events, such as an image upload to Amazon S3. It automatically scales from zero to thousands of concurrent executions, perfectly matching the requirement to avoid managing servers and to process images only when a new upload occurs.
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.
- ✗
Amazon EC2 Auto Scaling group
Why it's wrong here
EC2 Auto Scaling groups manage the number of EC2 instances, but they require ongoing server management and are not inherently event-driven to respond to individual image uploads. Using EC2 for this task would involve unnecessary overhead and cost.
- ✓
AWS Lambda
Why this is correct
AWS Lambda is a serverless compute service that runs code in response to triggers, such as an S3 upload event. It scales automatically and charges only for execution duration, making it perfect for short-lived, sporadic image processing tasks.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Amazon ECS with Fargate launch type
Why it's wrong here
While Amazon ECS with Fargate is serverless and can run containers, it is not as straightforward or cost-effective for simple, event-driven image resizing. ECS is more suited for long-running or batch container workloads, not for instantly responding to individual events.
- ✗
AWS Elastic Beanstalk
Why it's wrong here
Elastic Beanstalk is a platform as a service (PaaS) that automates the deployment and scaling of applications on managed servers. It requires a continuously running application environment and is not designed to execute code only in response to specific events like image uploads.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may choose Amazon ECS with Fargate because it is also serverless, but they overlook that Lambda is the simpler, event-driven, and cost-effective service for short-lived, stateless processing tasks triggered by S3 events.
Detailed technical explanation
How to think about this question
AWS Lambda integrates natively with Amazon S3 via event notifications, allowing the function to be invoked with the object key and bucket name as parameters. The function can then use the AWS SDK to download the image, process it (e.g., using Pillow or ImageMagick), and upload resized versions back to S3. Lambda's concurrency limit (default 1,000 per region, adjustable) and 15-minute timeout are well-suited for image processing tasks, though large images may require increasing memory (up to 10,240 MB) to avoid timeouts.
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.
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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 runs code in response to events, such as an image upload to Amazon S3. It automatically scales from zero to thousands of concurrent executions, perfectly matching the requirement to avoid managing servers and to process images only when a new upload occurs.
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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Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
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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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