The answer is to increase the Lambda function’s timeout to 30 seconds. This is correct because the function is timing out at 15 seconds while waiting for an HTTP response from an external API, so extending the timeout directly addresses the root cause by giving the API call more time to complete. On the AWS Certified DevOps Engineer Professional DOP-C02 exam, this scenario tests your understanding that Lambda timeout is an execution duration limit, not a concurrency or scaling issue—a common trap is to confuse timeout problems with throttling or batch size adjustments. The search intent “lambda timeout external api increase timeout” highlights that when an external dependency is slow, the simplest fix is to match the Lambda timeout to the SQS visibility timeout (30 seconds), which also prevents duplicate processing. Memory tip: “Timeout for the API, not for the concurrency” — when the external call drags, just extend the lag.
DOP-C02 Monitoring and Logging Practice Question
This DOP-C02 practice question tests your understanding of monitoring and logging. 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 DevOps engineer is troubleshooting an AWS Lambda function that processes messages from an Amazon SQS queue. The function is invoked successfully, but it frequently times out after 15 seconds. The function's CloudWatch Logs show that the timeout occurs while the function is making an HTTP request to an external API. The function's reserved concurrency is set to 5, and the SQS queue has a visibility timeout of 30 seconds. Which change would MOST effectively reduce the number of timeouts?
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's timeout to 30 seconds.
Option B is correct because increasing the Lambda function timeout to 30 seconds gives the HTTP request more time to complete, reducing timeouts. Option A is wrong because increasing concurrency would not help if the issue is the timeout duration. Option C is wrong because decreasing batch size might reduce load but not address the timeout for individual invocations. Option D is wrong because increasing the visibility timeout could cause duplicate processing but does not fix the Lambda 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.
✓
Increase the Lambda function's timeout to 30 seconds.
Why this is correct
Increasing the timeout gives the HTTP request more time to complete, reducing timeouts.
Related concept
Read the scenario before looking for a memorised answer.
✗
Increase the SQS queue's visibility timeout to 60 seconds.
Why it's wrong here
Increasing visibility timeout could cause duplicate processing but does not fix the Lambda timeout.
✗
Decrease the SQS batch size to 1.
Why it's wrong here
Decreasing batch size might reduce load but not address the timeout for individual invocations.
✗
Increase the Lambda function's reserved concurrency to 10.
Why it's wrong here
Increasing concurrency would not help if the issue is the timeout duration per invocation.
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.
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.
Monitoring and Logging — This question tests Monitoring and Logging — 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's timeout to 30 seconds. — Option B is correct because increasing the Lambda function timeout to 30 seconds gives the HTTP request more time to complete, reducing timeouts. Option A is wrong because increasing concurrency would not help if the issue is the timeout duration. Option C is wrong because decreasing batch size might reduce load but not address the timeout for individual invocations. Option D is wrong because increasing the visibility timeout could cause duplicate processing but does not fix the Lambda 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.
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This DOP-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 DOP-C02 exam.
Question Discussion
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