The correct choice is to instrument the application with AWS X-Ray to trace requests and identify bottlenecks. This is because X-Ray provides end-to-end visibility into request paths, allowing you to pinpoint exactly which downstream service, database call, or function call is causing latency spikes, even when CPU and network metrics appear normal. On the AWS Certified DevOps Engineer Professional DOP-C02 exam, this scenario tests your understanding that high-level infrastructure metrics can mask application-layer issues, and that distributed tracing is the proper diagnostic tool for intermittent latency. A common trap is to confuse X-Ray with CloudWatch Synthetics, which only tests external endpoints, or to reach for Container Insights when the environment is not containerized. Remember the key distinction: if the infrastructure looks healthy but the user experience is slow, you need to trace the request, not monitor the host. Memory tip: "When metrics are fine but latency climbs, X-Ray traces the lines."
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.
A company has a critical application running on Amazon EC2 instances behind an Application Load Balancer. The application is experiencing intermittent latency spikes. The DevOps team has enabled detailed monitoring on the EC2 instances and is using CloudWatch metrics. They notice that CPU utilization and network traffic are normal during the spikes. Which additional diagnostic step should the team take to identify the root cause?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Instrument the application with AWS X-Ray to trace requests and identify bottlenecks.
Option B is correct because X-Ray can trace requests end-to-end and identify which component is causing latency, even if CPU and network are normal. Option A is wrong because Synthetics monitors external endpoints, not internal application behavior. Option C is wrong because Container Insights is for containerized environments. Option D is wrong because Trusted Advisor is not a diagnostic tool.
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.
✓
Instrument the application with AWS X-Ray to trace requests and identify bottlenecks.
Why this is correct
X-Ray provides end-to-end tracing to find latency sources.
Related concept
Read the scenario before looking for a memorised answer.
✗
Use CloudWatch Container Insights to monitor the performance of the EC2 instances.
Why it's wrong here
Container Insights is for ECS/EKS, not standalone EC2.
✗
Enable CloudWatch Synthetics to create canaries that monitor the application endpoints.
Why it's wrong here
Synthetics tests external availability, not internal latency causes.
✗
Run an AWS Trusted Advisor check to identify performance-related recommendations.
Why it's wrong here
Trusted Advisor provides general recommendations, not real-time diagnostics.
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 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: Instrument the application with AWS X-Ray to trace requests and identify bottlenecks. — Option B is correct because X-Ray can trace requests end-to-end and identify which component is causing latency, even if CPU and network are normal. Option A is wrong because Synthetics monitors external endpoints, not internal application behavior. Option C is wrong because Container Insights is for containerized environments. Option D is wrong because Trusted Advisor is not a diagnostic tool.
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.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
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 company is running a web application on Amazon EC2 instances behind an Application Load Balancer. The application is experiencing intermittent errors. The DevOps engineer needs to identify if the errors are caused by the application or the underlying infrastructure. Which solution provides the MOST detailed visibility into the application's behavior?
medium
A.Enable VPC Flow Logs and analyze traffic patterns
B.Enable AWS CloudTrail and monitor for API errors
✓ C.Instrument the application with AWS X-Ray SDK and analyze traces
D.Enable detailed CloudWatch metrics on the EC2 instances and ALB
Why C: Option C is correct because AWS X-Ray provides end-to-end tracing of requests as they travel through the application, allowing the engineer to pinpoint where errors occur. Option A is wrong because CloudWatch metrics only show aggregate data, not per-request details. Option B is wrong because VPC Flow Logs capture network traffic metadata, not application-level errors. Option D is wrong because CloudTrail records API calls, not application errors.
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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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