Question 1mediummultiple choice
Full question →mediummultiple choiceObjective-mapped
A company runs a monolithic web application on Amazon EC2 that processes user-uploaded files synchronously. During peak hours, the application experiences slow response times because the file processing blocks the web server. The company wants to decouple the upload process from the file processing to improve responsiveness and allow each component to scale independently. The file processing backend must poll for new work and handle failures gracefully by retrying failed messages. Which AWS service should the company use to implement this decoupling?
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 Simple Notification Service (SNS)
Amazon SNS is a publish/subscribe messaging service. It pushes messages to subscribers (e.g., HTTP endpoints, email, Lambda) but does not provide a queue where consumers poll for work. It is not designed for decoupling with polling-based retry logic, making it unsuitable for this scenario.
B
Best answer
Amazon Simple Queue Service (SQS)
Amazon SQS is a fully managed message queue that enables asynchronous communication between application components. The frontend sends a message to the SQS queue, and the processing backend polls the queue for messages. SQS supports at-least-once delivery and can be configured to retain failed messages for retries, meeting the requirements perfectly.
C
Distractor review
Amazon Kinesis Data Streams
Amazon Kinesis Data Streams is designed for real-time streaming of large amounts of data, such as click streams or IoT telemetry. While it can decouple producers and consumers, it is overkill for simple file-processing work queues and does not natively support message-level retry or visibility timeout in the same way SQS does.
D
Distractor review
Amazon MQ
Amazon MQ is a managed message broker service that supports industry-standard APIs like JMS. It is best suited for migrating existing applications that use traditional message brokers (e.g., ActiveMQ, RabbitMQ). For a simple, native cloud-native decoupling pattern, SQS is more cost-effective and easier to manage than Amazon MQ.
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.
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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: Amazon Simple Queue Service (SQS) — Amazon Simple Queue Service (SQS) is a fully managed message queue service that decouples application components. Producers send messages to a queue, and consumers poll the queue to retrieve and process messages. This allows the web server to respond quickly after placing the upload in the queue, while the processing backend can scale independently and retry failed messages. SQS is the correct choice for building a decoupled, resilient architecture with work queues.
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.
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