The answer is that the Lambda function timeout is set too low. This is the most likely cause because the default Lambda timeout is 3 seconds, and if your function takes longer than that to process an SQS message—for example, due to a slow downstream API call or heavy computation—it will be forcibly terminated. On the AWS Certified Developer Associate DVA-C02 exam, this question tests your understanding of Lambda execution configuration versus SQS mechanics; a common trap is confusing the Lambda timeout with the SQS visibility timeout, which controls how long a message stays hidden after being polled, not the function’s runtime limit. Remember that reserved concurrency affects scaling, not individual execution duration, and a dead-letter queue only catches messages after processing failures. To avoid this pitfall, always check the function’s basic settings first when debugging a 3-second timeout. Memory tip: “Three seconds is Lambda’s default—if your code runs longer, you must extend the timer.”
DVA-C02 Troubleshooting and Optimization Practice Question
This DVA-C02 practice question tests your understanding of troubleshooting and optimization. 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 notices that an AWS Lambda function is timing out after 3 seconds. The function processes messages from an SQS queue. What is the MOST likely cause of the timeout?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The Lambda function timeout is set too low.
The function's timeout setting is likely lower than the time needed for processing. Option A is correct because the default Lambda timeout is 3 seconds, and increasing it can resolve the issue. Option B is wrong because SQS visibility timeout controls message redelivery, not function timeout. Option C is wrong because reserved concurrency affects scaling, not individual function timeout. Option D is wrong because the DLQ is for failed messages, not timeout control.
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.
✗
The SQS dead-letter queue is not configured.
Why it's wrong here
DLQ is for storing failed messages after retries, not for timeout issues.
✗
The SQS queue visibility timeout is too short.
Why it's wrong here
Visibility timeout affects when messages reappear, not the Lambda execution timeout.
✓
The Lambda function timeout is set too low.
Why this is correct
The default timeout is 3 seconds; increasing it resolves the timeout.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
The Lambda function's reserved concurrency is set to zero.
Why it's wrong here
Reserved concurrency limits concurrent executions, not timeout.
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 DVA-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.
Troubleshooting and Optimization — This question tests Troubleshooting and Optimization — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The Lambda function timeout is set too low. — The function's timeout setting is likely lower than the time needed for processing. Option A is correct because the default Lambda timeout is 3 seconds, and increasing it can resolve the issue. Option B is wrong because SQS visibility timeout controls message redelivery, not function timeout. Option C is wrong because reserved concurrency affects scaling, not individual function timeout. Option D is wrong because the DLQ is for failed messages, not timeout control.
What should I do if I get this DVA-C02 question wrong?
Identify which DVA-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.
Are there clue words in this question I should notice?
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
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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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 reports that an AWS Lambda function is timing out after 3 seconds. The function reads from an Amazon SQS queue. What is the most likely cause?
easy
A.The Lambda function memory is set too low, causing slow execution.
✓ B.The Lambda function timeout is set to 3 seconds, which is too low.
C.The Lambda execution role lacks permissions to poll SQS.
D.The SQS queue is empty, causing the function to wait indefinitely.
Why B: The Lambda function is timing out after exactly 3 seconds because its configured timeout is set to 3 seconds, which is too low for the workload. Lambda has a maximum execution timeout of 15 minutes (900 seconds), but the default timeout is 3 seconds. Since the function reads from an SQS queue, it likely needs more time to process messages, and increasing the timeout value will resolve the issue.
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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.
Question Discussion
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