The answer is that the function timeout is set too low. This is the most likely cause because the Lambda execution log shows the invocation was terminated at exactly 3000 milliseconds, which is the default timeout value of 3 seconds, while the function was still processing. In AWS Lambda, if a function does not complete within its configured timeout period, the runtime forcibly halts execution and throws a timeout error, regardless of memory usage or initialization time. On the AWS Certified DevOps Engineer Professional DOP-C02 exam, this scenario tests your ability to distinguish between timeout-related failures and other common issues like memory exhaustion or cold starts; a frequent trap is assuming high memory usage is the culprit when the log actually shows minimal consumption. Remember the mnemonic “3 seconds to default” — if you see a timeout at exactly 3000 ms, the timeout setting is the first thing to check before optimizing code or increasing memory.
DOP-C02 Monitoring and Logging Practice Question
This DOP-C02 practice question tests your understanding of monitoring and logging. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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.
Exhibit
Refer to the exhibit.
```
2023-03-15T10:00:00.000Z ERROR Invoke Error { "errorMessage": "Timeout", "errorType": "FunctionTimeout" }
2023-03-15T10:00:00.500Z END RequestId: abc123
2023-03-15T10:00:00.500Z REPORT RequestId: abc123 Duration: 3000.00 ms Billed Duration: 3000 ms Memory Size: 128 MB Max Memory Used: 64 MB Init Duration: 200.00 ms
```
A Lambda function is timing out. The log above shows a recent invocation. What is the most likely cause?
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 function timeout is set too low.
Option B is correct because the function timed out at 3000 ms, which is the default timeout (3 seconds). The function needs a longer timeout or optimization. Option A is wrong because memory usage is only 64 MB out of 128 MB. Option C is wrong because there was only one invocation. Option D is wrong because the init duration is normal.
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 function is running out of memory.
Why it's wrong here
Max memory used is 64 MB, well below the limit.
✗
The function is being invoked too frequently.
Why it's wrong here
Only one invocation is shown.
✗
The function is experiencing a cold start.
Why it's wrong here
Init duration is only 200 ms, which is normal.
✓
The function timeout is set too low.
Why this is correct
The duration is 3000 ms, which is the default 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.
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.
Trap categories for this question
Command / output trap
Only one invocation is shown.
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 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.
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: The function timeout is set too low. — Option B is correct because the function timed out at 3000 ms, which is the default timeout (3 seconds). The function needs a longer timeout or optimization. Option A is wrong because memory usage is only 64 MB out of 128 MB. Option C is wrong because there was only one invocation. Option D is wrong because the init duration is normal.
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.
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.
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Question Discussion
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