Question 1mediummultiple choice
Full question →mediummultiple choiceObjective-mapped
A company runs an e-commerce web application on Amazon EC2 instances. During flash sales, the backend order processing service becomes overloaded and drops requests, causing customer failures. The company needs a durable, scalable, and fully managed service to buffer incoming order requests and decouple the web tier from the backend processing tier. Orders must be stored reliably and processed in the order they were received. Which AWS service should the company use?
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 pub/sub messaging service used for sending notifications to many subscribers. It does not buffer messages in a queue or guarantee FIFO ordering, so it is not suitable for decoupling and buffering order requests.
B
Best answer
Amazon Simple Queue Service (SQS)
Amazon SQS is a fully managed message queuing service that decouples application components. It can durably store messages until they are processed, and FIFO queues guarantee exactly-once processing and strict message ordering. This matches all stated requirements.
C
Distractor review
Amazon Kinesis Data Streams
Amazon Kinesis Data Streams is designed for real-time streaming of large data volumes (e.g., clickstreams, logs). While it can retain data, it is not a simple order-processing queue and is overkill for buffering Web order requests. It also does not guarantee FIFO ordering for individual messages in the same way SQS FIFO does.
D
Distractor review
Amazon MQ
Amazon MQ is a managed message broker service for Apache ActiveMQ and RabbitMQ. It is useful for migrating existing applications that use those protocols, but for a new, simple queue with FIFO ordering, Amazon SQS is simpler, more scalable, and more cost-effective.
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) — This scenario describes a classic decoupling and buffering need. The required service must act as a durable queue that holds messages until the backend can process them, and it must guarantee first-in-first-out (FIFO) ordering. Amazon Simple Queue Service (SQS) is a fully managed message queuing service that exactly meets these requirements. SQS FIFO queues ensure that messages are delivered exactly once and processed in the order they are sent. Amazon SNS is a pub/sub messaging service that does not provide a durable queue or ordering. Amazon Kinesis Data Streams is designed for real-time streaming of large data volumes and is more complex than needed for simple order buffering. Amazon MQ is a managed message broker for applications that use standard messaging protocols (e.g., ActiveMQ), but for a straightforward queue with ordering, SQS is the simpler and more cost-effective choice.
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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