SAP-C02 Design for New Solutions Practice Question
A company wants to decouple a web application frontend from a backend processing service. The frontend sends jobs that are processed asynchronously. Which AWS service is best suited for this decoupling?
⚠ Common exam trap
Test-takers frequently confuse SNS (push-based pub/sub) with SQS (pull-based queue) for decoupling, failing to recognize that asynchronous job processing requires the backend to pull messages, not receive pushes, and that SNS alone does not provide a buffer for unprocessed jobs.
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 SQS
Amazon SQS is the best choice for decoupling a web application frontend from a backend processing service because it provides a fully managed message queue that allows the frontend to send jobs (messages) asynchronously without waiting for the backend to process them. The backend can poll the queue at its own pace, ensuring reliable, scalable, and fault-tolerant communication between the two components. SQS supports standard queues for high throughput and FIFO queues for exactly-once processing, making it ideal for decoupling asynchronous workloads.
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 SQS
Why this is correct
SQS provides a reliable message queue.
- ✗
Amazon SNS
Why it's wrong here
SNS is for push notifications, not job queues.
- ✗
Amazon Kinesis
Why it's wrong here
Kinesis is for real-time streaming.
- ✗
AWS Step Functions
Why it's wrong here
Step Functions orchestrates workflows, not simple queuing.
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JA
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.