The answer is AWS Lambda, the most appropriate service for running code in response to an S3 object upload without managing servers. This is because Lambda is a serverless compute service that executes code only when triggered by events, such as S3 event notifications configured on a bucket, and it natively supports code runtimes up to 15 minutes per invocation—well beyond the less-than-5-minute requirement. On the AWS Certified Cloud Practitioner CLF-C02 exam, this scenario tests your understanding of event-driven architecture and the core serverless compute offering; a common trap is confusing Lambda with AWS Fargate or Amazon EC2, which require more infrastructure management. Remember that Lambda is purpose-built for short-lived, event-driven tasks like processing uploaded images or logs, while EC2 is for persistent servers. A helpful memory tip: think of Lambda as a “fire-and-forget” function—it runs, finishes, and disappears, making it ideal for S3 triggers.
CLF-C02 Cloud Technology and Services Practice Question
This CLF-C02 practice question tests your understanding of cloud technology and services. 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 developer wants to run code in response to an S3 object upload without managing any servers. The code runs for less than 5 minutes. Which AWS service is most appropriate?
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 most appropriate service because it is a serverless compute service that automatically runs code in response to events, such as an S3 object upload, without requiring any server management. Lambda supports code execution up to 15 minutes per invocation, which easily accommodates the less-than-5-minute requirement, and it integrates natively with S3 event notifications via the S3 bucket notification configuration.
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
Why it's wrong here
EC2 requires server management and is not event-driven; it would be over-engineered for this use case.
✗
AWS Fargate
Why it's wrong here
Fargate runs containerized workloads but is typically used for longer-running tasks, not simple event-driven file processing.
✓
AWS Lambda
Why this is correct
Lambda triggers directly on S3 events, runs the code without server management, and is cost-effective for short-duration processing.
Related concept
Read the scenario before looking for a memorised answer.
✗
Amazon ECS
Why it's wrong here
ECS manages containerized applications and requires more setup than Lambda for simple event-triggered processing.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may confuse AWS Fargate (serverless containers) with AWS Lambda (serverless functions), but Fargate still requires container management and is not event-driven by S3 uploads without additional services like EventBridge or S3 Event Notifications to a custom endpoint.
Detailed technical explanation
How to think about this question
Under the hood, AWS Lambda uses a Firecracker microVM to isolate each invocation, ensuring secure and fast cold starts. When an S3 object upload triggers a Lambda function, S3 publishes an event notification to the Lambda service via the S3 API, which then invokes the function synchronously or asynchronously. In real-world scenarios, this pattern is commonly used for image processing (e.g., resizing uploaded images) or data transformation (e.g., converting CSV to JSON), where the function runs for seconds to minutes.
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.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this CLF-C02 question in full detail.
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 most appropriate service because it is a serverless compute service that automatically runs code in response to events, such as an S3 object upload, without requiring any server management. Lambda supports code execution up to 15 minutes per invocation, which easily accommodates the less-than-5-minute requirement, and it integrates natively with S3 event notifications via the S3 bucket notification configuration.
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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Question Discussion
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