- 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. A key principle to apply: sQS provides a reliable buffer for events, decoupling producers from consumers.. 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:
"best"Why it matters: Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
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 at-least-once processing through message visibility timeouts and retries. The redrive policy moves messages to a dead-letter queue (DLQ) after a defined receive count, ensuring bounded retries and preserving unprocessable events for later inspection and reprocessing. Making the Lambda idempotent prevents duplicate side effects from at-least-once delivery.
Key principle: SQS provides a reliable buffer for events, decoupling producers from consumers.
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 words "best", "least" in the question point toward this answer.
Related concept
SQS provides a reliable buffer for events, decoupling producers from consumers.
- ✗
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.
- ✗
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.
- ✗
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.
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 fail after all retries are exhausted.
Detailed technical explanation
How to think about this question
EventBridge can send events directly to SQS, which then triggers Lambda via event source mapping. The SQS redrive policy uses a maxReceiveCount (e.g., 3 or 5) to move messages to a DLQ after repeated processing failures, preserving the original event payload. Lambda's idempotency can be achieved using a unique event ID (e.g., EventBridge's `id` field) stored in a DynamoDB table or using conditional writes to prevent duplicate order status updates.
KKey Concepts to Remember
- SQS provides a reliable buffer for events, decoupling producers from consumers.
- SQS redrive policy with a DLQ enables bounded retries and preserves failed messages.
- Lambda functions processing SQS messages should be idempotent to handle duplicate deliveries.
- EventBridge can directly send events to SQS queues.
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
SQS provides a reliable buffer for events, decoupling producers from consumers.
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. SQS provides a reliable buffer for events, decoupling producers from consumers. Cloud exam questions reward reading the constraint carefully: the same technology can be right or wrong depending on the use case.
What to study next
Got this wrong? Here's your next step.
Review sQS provides a reliable buffer for events, decoupling producers from consumers., then practise related SAA-C03 questions on the same topic to reinforce the concept.
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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 — SQS provides a reliable buffer for events, decoupling producers from consumers..
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 at-least-once processing through message visibility timeouts and retries. The redrive policy moves messages to a dead-letter queue (DLQ) after a defined receive count, ensuring bounded retries and preserving unprocessable events for later inspection and reprocessing. Making the Lambda idempotent prevents duplicate side effects from at-least-once delivery.
What should I do if I get this SAA-C03 question wrong?
Review sQS provides a reliable buffer for events, decoupling producers from consumers., then practise related SAA-C03 questions on the same topic to reinforce the concept.
Are there clue words in this question I should notice?
Yes — watch for: "best", "least". Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
What is the key concept behind this question?
SQS provides a reliable buffer for events, decoupling producers from consumers.
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Last reviewed: Jun 11, 2026
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