- A
Use a single Amazon SQS standard queue with a deduplication ID to ensure each message is processed only once.
Why wrong: Incorrect. SQS standard queues do not guarantee order or exactly-once processing, even with deduplication ID.
- B
Use an Amazon SQS FIFO queue with a message group ID to ensure messages are processed exactly once and in order.
Correct. SQS FIFO queues with message group ID ensure exactly-once processing and preserve order.
- C
Use Amazon Kinesis Data Streams with a single shard and implement idempotent processing in the consumer.
Why wrong: Incorrect. While Kinesis Data Streams with a single shard can provide ordering, it does not guarantee exactly-once processing and introduces additional complexity.
- D
Use Amazon SNS with a FIFO topic and subscribe SQS FIFO queues to ensure ordered delivery.
Why wrong: Incorrect. Although SNS FIFO topics do provide ordering and exactly-once delivery to subscribed SQS FIFO queues, this solution adds unnecessary components and cost when SQS FIFO alone suffices.
SAP-C02 Design for New Solutions Practice Question
This SAP-C02 practice question tests your understanding of design for new solutions. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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 is migrating a monolithic e-commerce application to a microservices architecture on AWS. The application consists of several services that need to communicate asynchronously. The company wants to decouple the services and ensure that messages are processed exactly once and in order. The current solution uses a single Amazon SQS queue with multiple consumers, but messages are sometimes processed out of order or duplicated. The company needs a solution that guarantees order and exactly-once processing without introducing significant latency. Which approach should be used?
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
Use an Amazon SQS FIFO queue with a message group ID to ensure messages are processed exactly once and in order.
Option B is correct because Amazon SQS FIFO queues guarantee exactly-once processing and preserve message order. Option A: SQS standard queues do not guarantee order or exactly-once. Option C: Amazon Kinesis Data Streams can provide ordering within a shard but does not guarantee exactly-once processing; also adds complexity. Option D: SNS FIFO topics do guarantee exactly-once delivery to subscribers like SQS FIFO queues, but using SNS with FIFO topics and SQS FIFO queues is a valid solution, though it introduces additional components and cost compared to using SQS FIFO directly. However, the question asks for a single approach, and SQS FIFO alone meets the requirements without extra complexity.
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.
- ✗
Use a single Amazon SQS standard queue with a deduplication ID to ensure each message is processed only once.
Why it's wrong here
Incorrect. SQS standard queues do not guarantee order or exactly-once processing, even with deduplication ID.
- ✓
Use an Amazon SQS FIFO queue with a message group ID to ensure messages are processed exactly once and in order.
Why this is correct
Correct. SQS FIFO queues with message group ID ensure exactly-once processing and preserve order.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Use Amazon Kinesis Data Streams with a single shard and implement idempotent processing in the consumer.
Why it's wrong here
Incorrect. While Kinesis Data Streams with a single shard can provide ordering, it does not guarantee exactly-once processing and introduces additional complexity.
- ✗
Use Amazon SNS with a FIFO topic and subscribe SQS FIFO queues to ensure ordered delivery.
Why it's wrong here
Incorrect. Although SNS FIFO topics do provide ordering and exactly-once delivery to subscribed SQS FIFO queues, this solution adds unnecessary components and cost when SQS FIFO alone suffices.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Detailed technical explanation
How to think about this question
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
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.
- Use explanations to understand the rule behind the answer.
TExam Day Tips
- Underline the problem statement mentally.
- 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 startup's cloud architect reviews their monthly bill and notices costs are higher than expected for a long-running batch job. Switching from on-demand instances to Reserved Instances — or using Spot/Preemptible VMs — can reduce compute costs by up to 72 %. Questions like this test whether you understand the tradeoffs between commitment, flexibility, and cost across cloud pricing models.
What to study next
Got this wrong? Here's your next step.
Identify which SAP-C02 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
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FAQ
Questions learners often ask
What does this SAP-C02 question test?
Design for New Solutions — This question tests Design for New Solutions — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Use an Amazon SQS FIFO queue with a message group ID to ensure messages are processed exactly once and in order. — Option B is correct because Amazon SQS FIFO queues guarantee exactly-once processing and preserve message order. Option A: SQS standard queues do not guarantee order or exactly-once. Option C: Amazon Kinesis Data Streams can provide ordering within a shard but does not guarantee exactly-once processing; also adds complexity. Option D: SNS FIFO topics do guarantee exactly-once delivery to subscribers like SQS FIFO queues, but using SNS with FIFO topics and SQS FIFO queues is a valid solution, though it introduces additional components and cost compared to using SQS FIFO directly. However, the question asks for a single approach, and SQS FIFO alone meets the requirements without extra complexity.
What should I do if I get this SAP-C02 question wrong?
Identify which SAP-C02 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 20, 2026
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.
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