- A
Use a dead-letter queue to capture messages that fail processing after all retries.
Why wrong: Helps prevent loss but does not reduce backlog.
- B
Decrease the batch size to 1 to avoid processing multiple messages at once.
Why wrong: Reduces throughput, making backlog worse.
- C
Increase the Lambda function timeout to 60 seconds and increase the SQS visibility timeout to 90 seconds.
This allows the function to complete and prevents premature retries.
- D
Increase the Lambda function reserved concurrency to 100 to allow more concurrent executions.
Why wrong: More concurrent executions may still time out.
Question 1,614 of 1,750
DOP-C02 Incident and Event Response Practice Question
This DOP-C02 practice question tests your understanding of incident and event response. 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 company is using AWS Lambda to process events from an Amazon SQS queue. The Lambda function is configured with a batch size of 10 and a maximum concurrency of 5. Recently, the function started experiencing high error rates and the SQS queue's ApproximateNumberOfMessagesVisible metric is increasing. The CloudWatch logs show that the function is timing out after 30 seconds. The function makes calls to an external API that sometimes takes more than 30 seconds to respond. The DevOps engineer needs to reduce the backlog and prevent message loss. The engineer is considering the following actions: A) Increase the Lambda function timeout to 60 seconds and increase the SQS visibility timeout to 90 seconds. B) Decrease the batch size to 1 to avoid processing multiple messages at once. C) Increase the Lambda function reserved concurrency to 100 to allow more concurrent executions. D) Use a dead-letter queue to capture messages that fail processing after all retries. Which combination of actions should the engineer take?
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
✓
Increase the Lambda function timeout to 60 seconds and increase the SQS visibility timeout to 90 seconds.
Option C is the correct action because increasing the Lambda function timeout to 60 seconds allows the function to wait longer for the external API, and increasing the SQS visibility timeout to 90 seconds prevents messages from becoming visible again before the function completes. This reduces unnecessary retries and helps clear the backlog. Option A (DLQ) is useful for capturing failed messages but does not address the timeout issue. Option B (decrease batch size) reduces throughput and worsens the backlog. Option D (increase concurrency) may lead to more timeouts if the function still cannot complete within the existing timeout.
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 dead-letter queue to capture messages that fail processing after all retries.
Why it's wrong here
Helps prevent loss but does not reduce backlog.
- ✗
Decrease the batch size to 1 to avoid processing multiple messages at once.
Why it's wrong here
Reduces throughput, making backlog worse.
- ✓
Increase the Lambda function timeout to 60 seconds and increase the SQS visibility timeout to 90 seconds.
Why this is correct
This allows the function to complete and prevents premature retries.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Increase the Lambda function reserved concurrency to 100 to allow more concurrent executions.
Why it's wrong here
More concurrent executions may still time out.
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.
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 DOP-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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Incident and Event Response — study guide chapter
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FAQ
Questions learners often ask
What does this DOP-C02 question test?
Incident and Event Response — This question tests Incident and Event Response — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Increase the Lambda function timeout to 60 seconds and increase the SQS visibility timeout to 90 seconds. — Option C is the correct action because increasing the Lambda function timeout to 60 seconds allows the function to wait longer for the external API, and increasing the SQS visibility timeout to 90 seconds prevents messages from becoming visible again before the function completes. This reduces unnecessary retries and helps clear the backlog. Option A (DLQ) is useful for capturing failed messages but does not address the timeout issue. Option B (decrease batch size) reduces throughput and worsens the backlog. Option D (increase concurrency) may lead to more timeouts if the function still cannot complete within the existing timeout.
What should I do if I get this DOP-C02 question wrong?
Identify which DOP-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.
About these practice questions
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Last reviewed: Jun 20, 2026
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