- A
Amazon Simple Queue Service (SQS)
Amazon SQS is a message queue service that reliably stores messages until they are consumed. It decouples the web tier from the processing tier, buffers orders during spikes, and ensures no orders are lost. This makes it the correct choice for this scenario.
- B
Amazon Simple Notification Service (SNS)
Why wrong: Amazon SNS is a pub/sub notification service that pushes messages to subscribers. It does not provide durable storage or buffering; if the subscriber is unavailable, messages may be lost. Therefore, it is not suitable for decoupling with guaranteed processing.
- C
Amazon Kinesis Data Streams
Why wrong: Amazon Kinesis Data Streams is a real-time streaming service designed for ingesting and processing large amounts of data in near real time. While it can handle high throughput, it is overkill for simple order buffering and does not offer the same straightforward decoupling pattern as SQS for point-to-point integration.
- D
AWS Step Functions
Why wrong: AWS Step Functions is a serverless orchestration service that allows you to coordinate multiple AWS services into a workflow. It is not a message queue and does not provide a durable buffer for storing individual order messages until they are processed.
CLF-C02 Cloud Technology and Services Practice Question
This CLF-C02 practice question tests your understanding of cloud technology and services. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
A company runs a web application that accepts customer orders. During peak hours, the order processing component often becomes overloaded, causing orders to be dropped. The company wants to ensure that every order is reliably stored and processed, and that the web tier and the processing tier can scale independently without losing data. Which AWS service should the company use to decouple the application components and provide a durable buffer for incoming orders?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Amazon Simple Queue Service (SQS)
Amazon Simple Queue Service (SQS) is the correct choice because it provides a fully managed, durable, and scalable message queue that decouples the web tier from the processing tier. Orders are reliably stored in an SQS queue until the processing component retrieves them, ensuring no orders are dropped even during peak loads. SQS guarantees at-least-once delivery and supports independent scaling of producers and consumers without data loss.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Amazon Simple Queue Service (SQS)
Why this is correct
Amazon SQS is a message queue service that reliably stores messages until they are consumed. It decouples the web tier from the processing tier, buffers orders during spikes, and ensures no orders are lost. This makes it the correct choice for this scenario.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Amazon Simple Notification Service (SNS)
Why it's wrong here
Amazon SNS is a pub/sub notification service that pushes messages to subscribers. It does not provide durable storage or buffering; if the subscriber is unavailable, messages may be lost. Therefore, it is not suitable for decoupling with guaranteed processing.
- ✗
Amazon Kinesis Data Streams
Why it's wrong here
Amazon Kinesis Data Streams is a real-time streaming service designed for ingesting and processing large amounts of data in near real time. While it can handle high throughput, it is overkill for simple order buffering and does not offer the same straightforward decoupling pattern as SQS for point-to-point integration.
- ✗
AWS Step Functions
Why it's wrong here
AWS Step Functions is a serverless orchestration service that allows you to coordinate multiple AWS services into a workflow. It is not a message queue and does not provide a durable buffer for storing individual order messages until they are processed.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse SQS with SNS, thinking both can decouple components, but SNS pushes messages and lacks a durable buffer, while SQS stores messages until consumers retrieve them, making it the correct choice for reliable order processing.
Detailed technical explanation
How to think about this question
SQS uses a distributed, replicated storage backend to ensure messages are persisted across multiple Availability Zones, providing 99.9% durability. The queue can be configured as a standard queue (high throughput, at-least-once delivery) or a FIFO queue (exactly-once processing, limited to 300 transactions per second). Under the hood, SQS employs a polling model (short or long polling) where consumers retrieve messages via the ReceiveMessage API, and messages are hidden for a configurable visibility timeout before being deleted to prevent duplicate processing.
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.
TExam Day Tips
- 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.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A media company stores terabytes of video archives that are accessed once a year for audit purposes. Moving these objects to a cold storage tier (Azure Archive, S3 Glacier, or Google Nearline) costs a fraction of hot storage. Questions like this test whether you understand storage tiers, access frequency tradeoffs, and retrieval latency requirements.
What to study next
Got this wrong? Here's your next step.
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FAQ
Questions learners often ask
What does this CLF-C02 question test?
Cloud Technology and Services — This question tests Cloud Technology and Services — 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 the correct choice because it provides a fully managed, durable, and scalable message queue that decouples the web tier from the processing tier. Orders are reliably stored in an SQS queue until the processing component retrieves them, ensuring no orders are dropped even during peak loads. SQS guarantees at-least-once delivery and supports independent scaling of producers and consumers without data loss.
What should I do if I get this CLF-C02 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
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Last reviewed: Jun 11, 2026
This CLF-C02 practice question is part of Courseiva's free Amazon Web Services certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the CLF-C02 exam.
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