- A
Publish the failed messages to an SNS topic for later processing.
Why wrong: This adds complexity; DLQ is the standard solution.
- B
Log the error and delete the message from the queue.
Why wrong: This loses the message.
- C
Increase the visibility timeout of the SQS queue.
Why wrong: This gives more time but does not isolate failed messages.
- D
Configure a dead-letter queue (DLQ) for the SQS queue.
DLQ captures failed messages after retries.
Question 123 of 1,616
Configuring a Dead-Letter Queue for Amazon SQS with AWS Lambda
This DVA-C02 practice question tests your understanding of development with aws services. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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 developer is debugging an AWS Lambda function that processes messages from an Amazon SQS queue. The function is failing with an error when processing certain messages. The developer wants to isolate the failed messages for later analysis without losing them. What should the developer do?
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
✓
Configure a dead-letter queue (DLQ) for the SQS queue.
Configuring a dead-letter queue (DLQ) for the SQS queue is the correct approach because it automatically captures messages that cannot be processed successfully after a specified number of retries (the redrive policy). This isolates the failed messages for later analysis without losing them, while allowing the function to continue processing other messages from the source queue.
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.
- ✗
Publish the failed messages to an SNS topic for later processing.
Why it's wrong here
This adds complexity; DLQ is the standard solution.
- ✗
Log the error and delete the message from the queue.
Why it's wrong here
This loses the message.
- ✗
Increase the visibility timeout of the SQS queue.
Why it's wrong here
This gives more time but does not isolate failed messages.
- ✓
Configure a dead-letter queue (DLQ) for the SQS queue.
Why this is correct
DLQ captures failed messages after retries.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may think logging and deleting the message (Option B) is sufficient for debugging, but this permanently loses the message payload, whereas a DLQ preserves the message for later analysis without manual intervention.
Detailed technical explanation
How to think about this question
An SQS dead-letter queue is configured via a redrive policy that specifies the source queue ARN, the dead-letter queue ARN, and a maxReceiveCount (e.g., 5). When a message is received more times than the maxReceiveCount without being deleted, SQS automatically moves it to the DLQ. The DLQ can be a standard or FIFO queue, and messages in the DLQ retain their original message attributes and body, enabling forensic analysis or reprocessing after fixing the bug.
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 DVA-C02 question test?
Development with AWS Services — This question tests Development with AWS Services — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Configure a dead-letter queue (DLQ) for the SQS queue. — Configuring a dead-letter queue (DLQ) for the SQS queue is the correct approach because it automatically captures messages that cannot be processed successfully after a specified number of retries (the redrive policy). This isolates the failed messages for later analysis without losing them, while allowing the function to continue processing other messages from the source queue.
What should I do if I get this DVA-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.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
Same concept, more angles
1 more ways this is tested on DVA-C02
These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. A developer is designing a messaging system where orders are placed into an SQS queue and processed by a Lambda function. The developer wants to ensure that failed messages are not lost and can be analyzed later. Which TWO steps should the developer take? (Choose 2.)
medium- ✓ A.Configure a dead-letter queue (DLQ) for the SQS queue.
- B.Enable Lambda function retries on failure.
- ✓ C.Set the redrive policy to move messages to the DLQ after a specified number of receive attempts.
- D.Increase the visibility timeout of the SQS queue.
- E.Set up a CloudWatch alarm to monitor the queue depth.
Why A: Option A is correct because configuring a dead-letter queue (DLQ) for the SQS queue ensures that messages that cannot be processed successfully after a specified number of attempts are moved to a separate queue. This prevents message loss and allows the developer to analyze the failed messages later, fulfilling the requirement to not lose failed messages and to enable analysis.
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Last reviewed: Jul 4, 2026
This DVA-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 DVA-C02 exam.
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