- A
Use a standard SQS queue and set the Lambda function reserved concurrency to 1.
Why wrong: Standard SQS queues offer at-least-once delivery, not exactly-once.
- B
Use an SQS FIFO queue and enable content-based deduplication.
SQS FIFO queues support exactly-once processing when combined with deduplication IDs.
- C
Use a standard SQS queue and configure Lambda destinations for the queue.
Why wrong: Lambda destinations handle async invocation results, not exactly-once processing.
- D
Use an SQS FIFO queue and configure DynamoDB Streams as the event source for Lambda.
Why wrong: SQS FIFO can directly trigger Lambda; DynamoDB Streams are not needed.
Question 1,530 of 1,746
SAP-C02 Design for New Solutions Practice Question
This SAP-C02 practice question tests your understanding of design for new solutions. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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 designing a new serverless application on AWS. The application consists of multiple AWS Lambda functions that process incoming events from an Amazon SQS queue. The company wants to ensure that each message is processed exactly once. Which configuration should the company use?
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 SQS FIFO queue and enable content-based deduplication.
Option B is correct because an SQS FIFO queue guarantees first-in, first-out delivery and exactly-once processing, eliminating duplicates within a message group. Enabling content-based deduplication allows the queue to automatically detect and discard duplicate messages based on the message body, ensuring each Lambda invocation processes a unique message without additional application logic.
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 standard SQS queue and set the Lambda function reserved concurrency to 1.
Why it's wrong here
Standard SQS queues offer at-least-once delivery, not exactly-once.
- ✓
Use an SQS FIFO queue and enable content-based deduplication.
Why this is correct
SQS FIFO queues support exactly-once processing when combined with deduplication IDs.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Use a standard SQS queue and configure Lambda destinations for the queue.
Why it's wrong here
Lambda destinations handle async invocation results, not exactly-once processing.
- ✗
Use an SQS FIFO queue and configure DynamoDB Streams as the event source for Lambda.
Why it's wrong here
SQS FIFO can directly trigger Lambda; DynamoDB Streams are not needed.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often assume reserved concurrency or Lambda destinations can enforce exactly-once processing, but only SQS FIFO queues with deduplication provide the necessary guarantee at the queue level.
Detailed technical explanation
How to think about this question
SQS FIFO queues use a deduplication ID (either provided explicitly or generated via content-based deduplication using SHA-256 of the message body) to identify and discard duplicates within a 5-minute deduplication interval. Lambda integrates with SQS FIFO via event source mappings that poll the queue in batches, and the service automatically deletes messages from the queue only after successful processing, maintaining the exactly-once guarantee. In contrast, standard SQS queues rely on at-least-once delivery, meaning duplicates can occur due to network retries or internal replication, making them unsuitable for strict exactly-once requirements.
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 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.
Quick reference
Cloud Service Model Comparison
| Model | You Manage | Provider Manages | Examples |
|---|---|---|---|
| IaaS | OS, runtime, apps, data | Hardware, hypervisor, networking | EC2, Azure VMs, GCP Compute Engine |
| PaaS | Apps and data | OS, runtime, middleware, hardware | Elastic Beanstalk, Azure App Service |
| SaaS | Data and settings only | Everything else | Microsoft 365, Salesforce, Workday |
| FaaS / Serverless | Function code only | Infra, scaling, runtime | Lambda, Azure Functions, Cloud Run |
| CaaS | Containers and apps | Kubernetes, OS, hardware | EKS, AKS, GKE |
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
- →
Design for New Solutions — study guide chapter
Learn the concepts, then practise the questions
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Design for New Solutions practice questions
Targeted practice on this topic area only
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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 SQS FIFO queue and enable content-based deduplication. — Option B is correct because an SQS FIFO queue guarantees first-in, first-out delivery and exactly-once processing, eliminating duplicates within a message group. Enabling content-based deduplication allows the queue to automatically detect and discard duplicate messages based on the message body, ensuring each Lambda invocation processes a unique message without additional application logic.
What should I do if I get this SAP-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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Last reviewed: Jul 4, 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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