- A
Send EventBridge events to an SQS queue, configure a redrive policy to move messages to a dead-letter queue (DLQ) after a defined receive count, and make the Lambda processing idempotent.
EventBridge-to-SQS provides buffering and decoupling; SQS redrive with a DLQ bounds retries and preserves failed events for analysis and replay.
- B
Invoke Lambda directly from EventBridge in asynchronous mode, and increase the Lambda timeout to reduce failures.
Why wrong: Direct asynchronous invocation lacks a DLQ-style retention mechanism for failed events and retries can be unpredictable.
- C
Use SNS topics with Lambda subscriptions, but remove all retry and DLQ configuration to minimize duplicate events.
Why wrong: Removing retries and DLQ leads to message loss and provides no systematic way to capture unprocessable events.
- D
Store failed events only in CloudWatch logs, and have operators manually copy log entries back into the database for reprocessing.
Why wrong: Logs are not a reliable data store for event replay and operationally burdens incident response while risking inconsistencies.
SAA-C03 Design Resilient Architectures Practice Question
This SAA-C03 practice question tests your understanding of design resilient architectures. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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.
Your order-processing system uses EventBridge rules to send events to a Lambda function that updates order status. Over the last week, some events fail with a transient database timeout, and the Lambda retries intermittently but then the events are lost (no alerts after failures). You want at-least-once processing, bounded retries, and a way to inspect unprocessable events for later reprocessing.
Which architecture change best meets these requirements?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue:
"least"Why it matters: You want the option with minimum overhead, fewest steps, or lowest impact — not the most feature-rich or comprehensive answer.
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
Send EventBridge events to an SQS queue, configure a redrive policy to move messages to a dead-letter queue (DLQ) after a defined receive count, and make the Lambda processing idempotent.
Option A is correct because it introduces an SQS queue between EventBridge and Lambda, which provides a durable buffer for events. The redrive policy moves events to a dead-letter queue (DLQ) after a defined number of failed processing attempts, ensuring bounded retries and preserving unprocessable events for later inspection and reprocessing. Making the Lambda idempotent guarantees at-least-once processing even if duplicate events occur.
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.
- ✓
Send EventBridge events to an SQS queue, configure a redrive policy to move messages to a dead-letter queue (DLQ) after a defined receive count, and make the Lambda processing idempotent.
Why this is correct
EventBridge-to-SQS provides buffering and decoupling; SQS redrive with a DLQ bounds retries and preserves failed events for analysis and replay.
Clue confirmation
The clue word "least" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Invoke Lambda directly from EventBridge in asynchronous mode, and increase the Lambda timeout to reduce failures.
Why it's wrong here
Direct asynchronous invocation lacks a DLQ-style retention mechanism for failed events and retries can be unpredictable.
When this WOULD be correct
This option would be correct if the question required minimal cost and complexity for a non-critical system where occasional event loss is acceptable, and there was no need for DLQ or reprocessing.
- ✗
Use SNS topics with Lambda subscriptions, but remove all retry and DLQ configuration to minimize duplicate events.
Why it's wrong here
Removing retries and DLQ leads to message loss and provides no systematic way to capture unprocessable events.
When this WOULD be correct
In a scenario where the requirement is exactly-once processing with no duplicates and no need for retries or inspection of failed events, and the system can tolerate event loss on failure.
- ✗
Store failed events only in CloudWatch logs, and have operators manually copy log entries back into the database for reprocessing.
Why it's wrong here
Logs are not a reliable data store for event replay and operationally burdens incident response while risking inconsistencies.
When this WOULD be correct
This option would be correct in a scenario where the requirement is to have a simple, low-cost solution for debugging and manual intervention, with no need for automated retries or DLQ, and where the volume of failures is very low and acceptable to handle manually.
Option-by-option analysis
Why each answer is right or wrong
Understanding why wrong answers are wrong — and when they would be correct — is what separates a 750 score from a 900. The SAA-C03 exam frequently reuses these exact scenarios with slightly different constraints.
✓Send EventBridge events to an SQS queue, configure a redrive policy to move messages to a dead-letter queue (DLQ) after a defined receive count, and make the Lambda processing idempotent.Correct answer▾
Why this is correct
EventBridge-to-SQS provides buffering and decoupling; SQS redrive with a DLQ bounds retries and preserves failed events for analysis and replay.
✗Invoke Lambda directly from EventBridge in asynchronous mode, and increase the Lambda timeout to reduce failures.Wrong answer — click to see why▾
Why this is wrong here
Asynchronous Lambda invocation from EventBridge has limited retry (0-2 attempts) and no DLQ support, so events lost after transient failures cannot be inspected or reprocessed, failing the requirement for bounded retries and inspectability.
★ When this WOULD be the correct answer
This option would be correct if the question required minimal cost and complexity for a non-critical system where occasional event loss is acceptable, and there was no need for DLQ or reprocessing.
Why candidates choose this
Candidates may think asynchronous invocation automatically handles retries and durability, overlooking that EventBridge async targets have no DLQ and limited retry, and that increasing timeout doesn't prevent loss from other transient failures.
✗Use SNS topics with Lambda subscriptions, but remove all retry and DLQ configuration to minimize duplicate events.Wrong answer — click to see why▾
Why this is wrong here
Removing retry and DLQ configuration prevents at-least-once processing and makes it impossible to inspect unprocessable events, directly contradicting the requirements.
★ When this WOULD be the correct answer
In a scenario where the requirement is exactly-once processing with no duplicates and no need for retries or inspection of failed events, and the system can tolerate event loss on failure.
Why candidates choose this
Candidates may think SNS with Lambda is simpler and that removing retries reduces duplicates, but they overlook the need for reliability and failure inspection.
✗Store failed events only in CloudWatch logs, and have operators manually copy log entries back into the database for reprocessing.Wrong answer — click to see why▾
Why this is wrong here
Storing failed events only in CloudWatch logs and manually reprocessing them does not provide automated retries, bounded retries, or a systematic way to inspect and reprocess unprocessable events, violating the requirements for at-least-once processing and automated reprocessing.
★ When this WOULD be the correct answer
This option would be correct in a scenario where the requirement is to have a simple, low-cost solution for debugging and manual intervention, with no need for automated retries or DLQ, and where the volume of failures is very low and acceptable to handle manually.
Why candidates choose this
Candidates may think that logging failures is sufficient for auditing and that manual reprocessing is acceptable, underestimating the need for automated retry and DLQ mechanisms to ensure reliability and reduce operational overhead.
Analysis generated from the official SAA-C03blueprint and verified against question context. The “when correct” sections are what AI assistants cite when candidates ask “what’s the difference between these options?”
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may think increasing Lambda timeout or relying on asynchronous invocation retries alone is sufficient, but they overlook the need for a DLQ to capture and inspect events that persistently fail, which is a key requirement for operational visibility and reprocessing.
Detailed technical explanation
How to think about this question
EventBridge can directly invoke Lambda asynchronously, but the default retry policy is limited (up to 2 retries with a maximum event age of 24 hours) and there is no native DLQ support for Lambda targets. By routing events through SQS, you gain control over retry behavior via the redrive policy (e.g., maxReceiveCount), and the DLQ acts as a persistent store for events that cannot be processed after all retries. Idempotency is typically achieved by including a unique event ID in the payload and using a conditional write or idempotency token in the database to prevent duplicate updates.
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 cloud solutions architect for a retail company is evaluating services for a new workload. The correct answer here reflects best practice for the specific scenario described — not a general cloud recommendation. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Cloud exam questions reward reading the constraint carefully: the same technology can be right or wrong depending on the use case.
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.
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FAQ
Questions learners often ask
What does this SAA-C03 question test?
Design Resilient Architectures — This question tests Design Resilient Architectures — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Send EventBridge events to an SQS queue, configure a redrive policy to move messages to a dead-letter queue (DLQ) after a defined receive count, and make the Lambda processing idempotent. — Option A is correct because it introduces an SQS queue between EventBridge and Lambda, which provides a durable buffer for events. The redrive policy moves events to a dead-letter queue (DLQ) after a defined number of failed processing attempts, ensuring bounded retries and preserving unprocessable events for later inspection and reprocessing. Making the Lambda idempotent guarantees at-least-once processing even if duplicate events occur.
What should I do if I get this SAA-C03 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Are there clue words in this question I should notice?
Yes — watch for: "least". You want the option with minimum overhead, fewest steps, or lowest impact — not the most feature-rich or comprehensive answer.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 11, 2026
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