Question 1mediummultiple choice
Full question →mediummultiple choiceObjective-mapped
A company is developing a microservices application on AWS. The application includes a front-end web tier and a backend order processing service. The front-end sends order requests to the backend, which may take several seconds to process. The company wants to ensure that the front-end does not wait for the backend to complete, and that no orders are lost if the backend service is temporarily unavailable. Which AWS service should the company use to decouple the front-end and backend?
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 ElastiCache
Amazon ElastiCache is an in-memory caching service used to improve read/write performance, not to decouple application components or handle asynchronous message delivery.
B
Best answer
Amazon Simple Queue Service (SQS)
Amazon SQS is a message queuing service that decouples application components. It allows the front-end to send messages to a queue, which are then processed by the backend independently, ensuring no data loss and asynchronous processing.
C
Distractor review
Amazon Route 53
Amazon Route 53 is a DNS (Domain Name System) web service used for routing end users to internet applications, not for decoupling application components or message delivery.
D
Distractor review
Amazon CloudWatch
Amazon CloudWatch is a monitoring and observability service for AWS resources and applications. It does not provide decoupling or message queue functionality.
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 queuing service that enables decoupling of application components. By placing order requests into an SQS queue, the front-end can continue operating without waiting for the backend. The backend processes messages from the queue at its own pace. If the backend is temporarily unavailable, messages remain safely in the queue until they can be processed. This ensures no orders are lost and the front-end remains responsive. Other services like ElastiCache, Route 53, and CloudWatch do not provide the queue-based decoupling needed for this asynchronous workload.
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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