Question 1mediummultiple choice
Full question →mediummultiple choiceObjective-mapped
A company runs a microservices-based e-commerce application on AWS. During peak hours, the order processing service often gets overwhelmed because the web frontend sends requests directly to it. This causes delays and occasional failures. The architecture team needs to decouple the frontend from the order processing service by introducing a fully managed, highly available, and durable message queue. The queue must automatically replicate messages across multiple Availability Zones and allow the order processing service to pull messages at its own pace. 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
Best answer
Amazon Simple Queue Service (SQS)
Correct. Amazon SQS is a fully managed message queuing service that decouples application components. It is highly available and durable, automatically replicating messages across multiple Availability Zones. It supports polling mechanisms, allowing the order processing service to consume messages at its own pace.
B
Distractor review
Amazon Simple Notification Service (SNS)
Incorrect. Amazon SNS is a pub/sub messaging service for sending notifications to multiple subscribers (e.g., email, Lambda, HTTP endpoints). It is not a queue; messages are pushed to subscribers immediately and not stored for polling. This does not provide the buffering and polling capability needed to decouple and protect the order processing service.
C
Distractor review
Amazon Kinesis Data Streams
Incorrect. Amazon Kinesis Data Streams is designed for real-time streaming of large amounts of data from many producers, such as clickstream data or IoT telemetry. It is more complex than needed for simple message decoupling and is not the most cost-effective choice for a standard queue pattern.
D
Distractor review
Amazon MQ
Incorrect. Amazon MQ is a managed message broker service for Apache ActiveMQ and RabbitMQ. It is useful when migrating existing applications that use industry-standard APIs and protocols. However, for new cloud-native applications that need a simple, fully managed queue, Amazon SQS is the more appropriate choice.
Common exam trap
Common exam trap: NAT rules depend on direction and matching traffic
NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.
Technical deep dive
How to think about this question
NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.
KKey Concepts to Remember
- Static NAT maps one inside address to one outside address.
- PAT allows many inside hosts to share one public address using ports.
- Inside local and inside global describe the private and translated addresses.
- NAT ACLs identify traffic for translation, not always security filtering.
TExam Day Tips
- Identify inside and outside interfaces first.
- Check whether the scenario needs static NAT, dynamic NAT or PAT.
- Do not confuse NAT matching ACLs with normal packet-filtering intent.
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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?
Static NAT maps one inside address to one outside address.
What is the correct answer to this question?
The correct answer is: Amazon Simple Queue Service (SQS) — The scenario requires a fully managed message queue service that decouples application components, provides high availability and durability through automatic replication across multiple Availability Zones, and allows consumers to poll for messages at their own pace. Amazon Simple Queue Service (SQS) is the correct service for this use case. SQS is a fully managed message queuing service that enables decoupling of microservices, distributed systems, and serverless applications. It stores messages durably and replicates them across at least three Availability Zones in each supported region. Consumers can poll or receive messages on demand, providing buffer and elasticity. Amazon SNS is a pub/sub notification service, not designed for point-to-point buffering; subscribers receive messages as they are published, not by polling. Amazon Kinesis Data Streams is intended for real-time streaming of large data volumes, often from many producers, and requires more configuration for simple queue use cases. Amazon MQ is a managed message broker for Apache ActiveMQ and RabbitMQ, suitable for migrating existing applications that use standard messaging protocols, but it is not as simple and cost-effective as SQS for cloud-native decoupling.
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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