Question 1mediummultiple choice
Full question →mediummultiple choiceObjective-mapped
A company wants to build a serverless application that processes images uploaded to an Amazon S3 bucket. When a user uploads a new image, the application must automatically resize the image to multiple dimensions and store the resized versions in the same bucket under a different prefix. The company wants to minimize operational overhead and pay only for the compute time used. Which AWS service should be used to run the image processing code?
Answer choices
Why each option matters
Good practice is not just finding the correct option. The wrong answers often show the exact trap the exam wants you to fall into.
A
Distractor review
Amazon EC2 Auto Scaling group
An Auto Scaling group manages a fleet of EC2 instances, which require provisioning and ongoing management. It is not event-driven and would need additional services to respond to S3 uploads, increasing complexity and cost.
B
Best answer
AWS Lambda
AWS Lambda is a serverless compute service that can be triggered directly by Amazon S3 events. It runs code only when an image is uploaded, scales automatically, and bills per millisecond of execution. This matches the requirements for minimal overhead and pay-per-use.
C
Distractor review
Amazon ECS with Fargate
Amazon ECS with Fargate runs containerized applications without managing servers, but it is typically used for long-running or scheduled tasks. To trigger it from S3 events, you would need an intermediary service like Amazon EventBridge or a custom polling mechanism, adding complexity and potential cost.
D
Distractor review
AWS Batch
AWS Batch is a fully managed batch computing service for running large-scale batch jobs. It is not designed for real-time event-driven processing and would require orchestration to run on each S3 upload, leading to unnecessary overhead and latency.
Common exam trap
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Technical deep dive
How to think about this question
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
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.
- Use explanations to understand the rule behind the answer.
TExam Day Tips
- Underline the problem statement mentally.
- 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.
Related practice questions
Related CLF-C02 practice-question pages
Use these pages to review the topic behind this question. This is how one missed question becomes focused revision.
AWS shared responsibility model practice questions
Practise CLF-C02 questions linked to AWS shared responsibility model.
AWS Cloud Practitioner cloud concepts practice questions
Practise CLF-C02 questions linked to AWS Cloud Practitioner cloud concepts.
AWS IAM practice questions
Practise CLF-C02 questions linked to AWS IAM.
AWS pricing practice questions
Practise CLF-C02 questions linked to AWS pricing.
AWS support plans practice questions
Practise CLF-C02 questions linked to AWS support plans.
AWS S3 practice questions
Practise CLF-C02 questions linked to AWS S3.
AWS EC2 practice questions
Practise CLF-C02 questions linked to AWS EC2.
More questions from this exam
Keep practising from the same exam bank, or move into a focused topic page if this question exposed a weak area.
Question 1
A developer needs to launch a test server for a new application prototype. The developer logs into the AWS Management Console, selects an Amazon EC2 instance type, configures the security group, and starts the instance. The instance is running within two minutes, and the developer did not need to submit a formal request to the company's IT procurement team or wait for approval from a cloud administrator. Which essential characteristic of cloud computing does this scenario best demonstrate?
Question 2
A solutions architect is planning a new web application on AWS. The workload will include 3 Amazon EC2 instances (t3.medium) running 24/7, an Application Load Balancer, and an Amazon RDS for MySQL db.t3.small database. The architect needs to estimate the monthly cost for the first year, considering different purchasing options (On-Demand, 1-year All Upfront Reserved Instance, and Compute Savings Plan). Which AWS tool should the architect use to create this estimate?
Question 3
A company's development team frequently needs temporary test environments. A developer can log into the AWS Management Console, select an Amazon EC2 instance type, configure storage, and launch the instance within minutes without any interaction with the IT infrastructure team. This capability is an example of which essential characteristic of cloud computing?
Question 4
A company's finance team needs to analyze AWS spending in detail. They require a report that includes hourly cost data for each AWS service, each individual resource (e.g., a specific EC2 instance), and any cost allocation tags applied. The team plans to export this data to an Amazon S3 bucket and then import it into a custom business intelligence (BI) analytics dashboard. Which AWS tool should the finance team use to generate this level of detailed cost data?
Question 5
A company uses AWS for its development environment. The finance team wants to set a monthly budget of $10,000. They want to receive an email notification when the actual costs reach 80% of the budget ($8,000) and again when costs exceed the budget. The team needs a managed AWS service that can automatically send these alerts without requiring custom code or third-party tools. Which AWS service should the team use?
Question 6
A company uses AWS Organizations to manage multiple accounts. The security team needs to enforce a policy that restricts SSH access (port 22) from the internet (0.0.0.0/0) in all VPCs across all accounts. The team wants to centrally define the allowed rules and automatically apply them to newly created VPCs and security groups, while also automatically remediating any existing non-compliant security groups. Which AWS service should the team use?
FAQ
Questions learners often ask
What does this CLF-C02 question test?
Read the scenario before looking for a memorised answer.
What is the correct answer to this question?
The correct answer is: AWS Lambda — The correct service is AWS Lambda. Lambda is a serverless compute service that runs code in response to events, such as an S3 object creation event. It automatically scales with the number of uploads and charges only for the compute time consumed. No servers to provision or manage. Amazon EC2 Auto Scaling groups require managing instances and are not event-driven in this manner. Amazon ECS with Fargate runs containers continuously or on a schedule, not automatically triggered by S3 events without additional setup. AWS Batch is designed for batch computing jobs that run on a schedule or queue, not for real-time event processing.
What should I do if I get this CLF-C02 question wrong?
Then try more questions from the same exam bank and focus on understanding why the wrong options are tempting.
Discussion
Loading comments…
Sign in to join the discussion.