SAP-C02 Design for New Solutions Practice Question
A company is migrating a monolithic application to a microservices architecture on AWS. They want to decouple the services and ensure that messages between services are processed asynchronously and durably. Which AWS service should they use for this purpose?
⚠ Common exam trap
SAP-C02 often tests whether candidates confuse SNS (push-based pub/sub, no durable storage) with SQS (pull-based queue, durable storage), causing them to pick SNS when the requirement explicitly says messages must be processed durably and asynchronously.
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 SQS is a fully managed message queue service designed for asynchronous, durable message passing between decoupled components. It stores messages redundantly across multiple Availability Zones, supports at-least-once delivery, and allows producers and consumers to operate independently — exactly matching the requirement for durable asynchronous processing in a microservices architecture.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
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Amazon Kinesis Data Streams
Why it's wrong here
Kinesis Data Streams provides ordered, replayable streaming with consumer-managed checkpoints, not per-message durable queue semantics with automatic redelivery. It suits real-time analytics and telemetry ingestion, where many consumers tail a shard. Here the requirement is decoupling with durable asynchronous processing, which Amazon SQS fulfils.
- ✓
Amazon Simple Queue Service (SQS)
Why this is correct
Amazon SQS provides durable, fully managed message queues that decouple microservice producers from consumers, satisfying the asynchronous processing requirement. Messages persist across multiple Availability Zones until successfully processed, and standard queues offer at-least-once delivery at scale. This directly meets the stem's need for durable, asynchronous inter-service communication without managing brokers.
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Amazon Simple Notification Service (SNS)
Why it's wrong here
SNS is a pub/sub fan-out service that pushes notifications to subscribers; it does not retain messages durably for later consumption, so an unavailable consumer loses them. It is tempting for decoupling, but it suits broadcasting events to many endpoints, whereas durable asynchronous processing requires a queue such as Amazon SQS.
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AWS Step Functions
Why it's wrong here
Step Functions orchestrates workflows as state machines, coordinating defined steps rather than providing a durable message buffer between decoupled services. It is tempting because it handles asynchronous execution, but it is correct for multi-step process orchestration, not for queue-based message decoupling with at-least-once durable delivery.
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JA
Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed September 2026 · checked against the official Amazon Web Services exam blueprint
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.