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 company is using a centralized logging solution with Amazon OpenSearch Service. The DevOps team notices that logs from some EC2 instances are missing. The CloudWatch agent is installed and configured on all instances. What should the team do to troubleshoot the issue?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Check the CloudWatch agent log file located at /var/log/amazon/amazon-cloudwatch-agent/amazon-cloudwatch-agent.log.
The CloudWatch agent writes detailed operational logs to /var/log/amazon/amazon-cloudwatch-agent/amazon-cloudwatch-agent.log. This file contains errors, warnings, and debug messages that can reveal why logs from specific EC2 instances are not being delivered to Amazon OpenSearch Service. Checking this log is the first and most direct troubleshooting step because it captures agent-level issues such as configuration errors, network connectivity failures, or permission problems.
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.
✗
Check the CloudWatch agent status using the CloudWatch agent status command.
Why it's wrong here
Status command shows metrics, but not detailed errors.
✗
Configure a Lambda function to poll the CloudWatch agent for logs.
Why it's wrong here
The agent pushes logs, not polled by Lambda.
✗
Verify that the EC2 instances have an SQS queue configured for log delivery.
Why it's wrong here
The CloudWatch agent does not use SQS.
✓
Check the CloudWatch agent log file located at /var/log/amazon/amazon-cloudwatch-agent/amazon-cloudwatch-agent.log.
Why this is correct
This log file contains errors and warnings that help troubleshoot the issue.
Related concept
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 may assume a 'status' command exists for the CloudWatch agent (Option A) because many other AWS services have such commands, but the agent uses a control script instead, and the real diagnostic starting point is the agent's own log file.
Trap categories for this question
Command / output trap
Status command shows metrics, but not detailed errors.
Detailed technical explanation
How to think about this question
The CloudWatch agent uses the 'cloudwatch-agent' user and writes logs to a local file with configurable log levels (e.g., 'debug', 'info', 'error'). Under the hood, the agent reads from configured log files using a tail-like mechanism and sends batches to CloudWatch Logs via the PutLogEvents API. If the agent fails to authenticate (e.g., due to missing or incorrect IAM instance profile permissions), it logs an 'AccessDeniedException' in the agent log file, which is a common root cause for missing logs.
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 company's IT admin needs to give a contractor read-only access to production logs without sharing account credentials. Using role-based access control (RBAC) and temporary scoped permissions — not a permanent shared password — is the correct pattern. Questions like this test whether you can apply least-privilege access across cloud identity services.
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: Check the CloudWatch agent log file located at /var/log/amazon/amazon-cloudwatch-agent/amazon-cloudwatch-agent.log. — The CloudWatch agent writes detailed operational logs to /var/log/amazon/amazon-cloudwatch-agent/amazon-cloudwatch-agent.log. This file contains errors, warnings, and debug messages that can reveal why logs from specific EC2 instances are not being delivered to Amazon OpenSearch Service. Checking this log is the first and most direct troubleshooting step because it captures agent-level issues such as configuration errors, network connectivity failures, or permission problems.
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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