The answer is to enable AWS X-Ray tracing on the Lambda function, as this provides the most detailed diagnostic information for intermittent timeouts. X-Ray captures end-to-end tracing with subsegments for each downstream call, function initialization, and execution phase, allowing you to pinpoint exactly where latency accumulates within the 30-second timeout window. On the AWS Certified DevOps Engineer Professional DOP-C02 exam, this question tests your understanding that CloudWatch Logs alone lack the granular timing breakdown needed for synchronous invocations, while X-Ray’s service map and trace timelines reveal the specific bottleneck—a common trap is choosing enhanced CloudWatch monitoring, which gives metrics but not per-invocation subsegment detail. Remember the memory tip: “X-Ray traces the race; logs just show the place.”
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 a production AWS Lambda function that occasionally times out. The function has a timeout of 30 seconds and uses a synchronous invocation. The engineer wants to capture invocation logs to identify the cause. Which approach will provide the MOST detailed diagnostic information?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Enable AWS X-Ray tracing on the Lambda function.
Option D is correct because AWS X-Ray provides end-to-end tracing for Lambda functions, capturing detailed timing information for each invocation, including subsegments for downstream calls, function initialization, and execution phases. This allows the engineer to pinpoint exactly where time is being spent, which is essential for diagnosing intermittent timeouts in synchronous invocations.
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.
✗
Enable AWS CloudTrail data events for Lambda.
Why it's wrong here
CloudTrail records API calls, not function execution timing.
✗
Create a CloudWatch dashboard with function duration metrics.
Why it's wrong here
Metrics show aggregated data, not per-invocation details.
✗
Add more logging statements to the function code and check CloudWatch Logs.
Why it's wrong here
Logging helps but may not capture precise timing of external calls.
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 often confuse CloudWatch Logs (which show custom log output) with X-Ray tracing (which provides automatic, detailed timing of every subcomponent), leading them to choose option C instead of the more diagnostic X-Ray approach.
Trap categories for this question
Command / output trap
Metrics show aggregated data, not per-invocation details.
Detailed technical explanation
How to think about this question
AWS X-Ray uses a trace ID propagated via the Lambda runtime, automatically recording segments for the function's initialization, invocation, and any downstream SDK calls (e.g., DynamoDB, S3). The X-Ray daemon runs in the Lambda execution environment, collecting subsegments with nanosecond precision, which is critical for identifying latency spikes in synchronous invocations where the client waits for a response within the 30-second timeout. In a real-world scenario, a timeout might be caused by a cold start or a slow downstream API call, which X-Ray can isolate by showing the exact duration of each subsegment.
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.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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: Enable AWS X-Ray tracing on the Lambda function. — Option D is correct because AWS X-Ray provides end-to-end tracing for Lambda functions, capturing detailed timing information for each invocation, including subsegments for downstream calls, function initialization, and execution phases. This allows the engineer to pinpoint exactly where time is being spent, which is essential for diagnosing intermittent timeouts in synchronous invocations.
What should I do if I get this DOP-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.
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Question Discussion
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