The answer is to enable AWS X-Ray tracing on both API Gateway and Lambda, as this provides the most granular end-to-end latency breakdown. X-Ray captures detailed segments for each component in the request path, including the time spent in API Gateway, the Lambda invocation, and any downstream calls, with subsegments that isolate cold starts, function execution, and external service latency. On the AWS Certified DevOps Engineer Professional DOP-C02 exam, this question tests your understanding of observability tools versus monitoring tools—a common trap is confusing CloudWatch metrics (which show aggregate latency but no breakdown) with X-Ray’s distributed tracing. Remember that CloudWatch gives you the *what* (how slow?), while X-Ray gives you the *why* (which part is slow?). A useful memory tip: think of X-Ray as a "request autopsy" that dissects each hop, whereas CloudWatch is just a "speedometer" for the whole trip.
DOP-C02 Monitoring and Logging Practice Question
This DOP-C02 practice question tests your understanding of monitoring and logging. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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 uses AWS Lambda functions behind an Amazon API Gateway REST API. The DevOps team wants to monitor the end-to-end latency of API requests, including the time spent in API Gateway and Lambda. Which approach provides the most granular breakdown?
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 API Gateway and Lambda.
Option D is correct because AWS X-Ray provides tracing that shows the time spent in each component (API Gateway, Lambda, downstream calls) with detailed segments and subsegments. Option A is wrong because CloudWatch metrics give aggregate latency but no breakdown. Option B is wrong because Lambda Insights provides OS-level metrics, not request tracing. Option C is wrong because VPC Flow Logs capture network traffic, not application latency.
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 Lambda Insights to get per-request latency breakdown.
Why it's wrong here
Lambda Insights provides CPU, memory, and disk metrics, not latency breakdown.
✓
Enable AWS X-Ray tracing on API Gateway and Lambda.
Why this is correct
X-Ray provides end-to-end tracing with detailed segment times.
Related concept
Read the scenario before looking for a memorised answer.
✗
Enable VPC Flow Logs to capture network round-trip times.
Why it's wrong here
Flow logs show network flows, not application latency.
✗
Use CloudWatch metrics for API Gateway and Lambda, then add them together.
Why it's wrong here
Metrics are aggregated and cannot be correlated per request.
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
Flow logs show network flows, not application latency.
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 healthcare organisation deploys an application with a public-facing web tier and a private database tier. The database subnet has no public IP and only accepts connections from the web tier's security group. Questions like this test whether you can design cloud network isolation using VNets/VPCs, subnets, and security group rules.
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: Enable AWS X-Ray tracing on API Gateway and Lambda. — Option D is correct because AWS X-Ray provides tracing that shows the time spent in each component (API Gateway, Lambda, downstream calls) with detailed segments and subsegments. Option A is wrong because CloudWatch metrics give aggregate latency but no breakdown. Option B is wrong because Lambda Insights provides OS-level metrics, not request tracing. Option C is wrong because VPC Flow Logs capture network traffic, not application latency.
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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