SAP-C02 Design for New Solutions Practice Question
A company wants to decouple a frontend API from backend processing to improve scalability and fault tolerance. The frontend sends requests that can be processed asynchronously. Which AWS service should be used to decouple the components?
⚠ Common exam trap
Candidates often confuse SNS (push-based notification) with SQS (pull-based queue) for decoupling, but SNS does not provide the durable, asynchronous message buffer required for decoupling frontend and backend processing.
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 message queue that decouples the frontend API from backend processing. The frontend can send requests to an SQS queue, and backend consumers can poll and process messages asynchronously, which improves scalability by buffering traffic spikes and enhances fault tolerance by persisting messages until they are successfully processed.
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 Notification Service (SNS)
Why it's wrong here
SNS is pub/sub; not ideal for decoupling a single producer-consumer.
- ✓
Amazon Simple Queue Service (SQS)
Why this is correct
SQS is a message queue that decouples components.
- ✗
Amazon Kinesis Data Streams
Why it's wrong here
Kinesis is for real-time streaming, not simple decoupling.
- ✗
AWS Step Functions
Why it's wrong here
Step Functions is for coordinating multiple services, not simple queuing.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This SAP-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 SAP-C02 exam.