- A
VPC Flow Logs
Why wrong: VPC Flow Logs capture network-level IP traffic metadata but do not include application-level details such as user agent. They are used for analyzing network traffic patterns, not for specific request-level details.
- B
Amazon S3 server access logs
Amazon S3 server access logs provide detailed records for every request, including source IP address, user agent, requester, operation, and HTTP status. This is the correct service to identify the source IP and user agent of the unauthorized request.
- C
AWS CloudTrail
Why wrong: AWS CloudTrail logs S3 API calls and includes sourceIPAddress and userAgent fields, but its primary focus is on API activity auditing. To capture object-level operations, you must enable data events, which adds complexity. S3 server access logs are the more straightforward choice for this specific need.
- D
Amazon CloudWatch Logs
Why wrong: Amazon CloudWatch Logs is a service for storing, monitoring, and analyzing log data, but it does not generate logs itself. S3 server access logs can be sent to CloudWatch Logs, but CloudWatch is not the source of the request information.
Using S3 Server Access Logs to Identify Request Details
This DOP-C02 practice question tests your understanding of incident and event response. 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 experiences a security incident where an unauthorized user accessed an S3 bucket containing sensitive data. The DevOps team needs to identify the source IP address and user agent of the request. Which AWS service provides this information?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Amazon S3 server access logs
Option B (Amazon S3 server access logs) is correct because they provide detailed records of each request made to an S3 bucket, including the source IP address and user agent. Option A (VPC Flow Logs) is incorrect because they capture IP traffic metadata (source/destination IP, ports, protocol) but do not include application-level details like the user agent. Option C (AWS CloudTrail) is incorrect because although CloudTrail logs S3 API calls and does include user agent and source IP, S3 server access logs are specifically designed to provide this information and are the recommended source for forensic analysis of S3 access. Option D (Amazon CloudWatch Logs) is incorrect because CloudWatch Logs is a service for storing, monitoring, and accessing log files; it does not generate logs itself but can be used to store and analyze logs from other sources.
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.
- ✗
VPC Flow Logs
Why it's wrong here
VPC Flow Logs capture network-level IP traffic metadata but do not include application-level details such as user agent. They are used for analyzing network traffic patterns, not for specific request-level details.
- ✓
Amazon S3 server access logs
Why this is correct
Amazon S3 server access logs provide detailed records for every request, including source IP address, user agent, requester, operation, and HTTP status. This is the correct service to identify the source IP and user agent of the unauthorized request.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
AWS CloudTrail
Why it's wrong here
AWS CloudTrail logs S3 API calls and includes sourceIPAddress and userAgent fields, but its primary focus is on API activity auditing. To capture object-level operations, you must enable data events, which adds complexity. S3 server access logs are the more straightforward choice for this specific need.
- ✗
Amazon CloudWatch Logs
Why it's wrong here
Amazon CloudWatch Logs is a service for storing, monitoring, and analyzing log data, but it does not generate logs itself. S3 server access logs can be sent to CloudWatch Logs, but CloudWatch is not the source of the request information.
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 media company stores terabytes of video archives that are accessed once a year for audit purposes. Moving these objects to a cold storage tier (Azure Archive, S3 Glacier, or Google Nearline) costs a fraction of hot storage. Questions like this test whether you understand storage tiers, access frequency tradeoffs, and retrieval latency requirements.
Quick reference
AWS S3 Storage Class Comparison
| Storage Class | Min Duration | Retrieval | Use Case |
|---|---|---|---|
| S3 Standard | None | Immediate | Frequently accessed data |
| S3 Standard-IA | 30 days | Immediate | Infrequent access, rapid retrieval |
| S3 One Zone-IA | 30 days | Immediate | Non-critical infrequent data |
| S3 Intelligent-Tiering | None | Immediate–hours | Unknown or changing access patterns |
| S3 Glacier Instant | 90 days | Milliseconds | Archive with instant retrieval |
| S3 Glacier Flexible | 90 days | Minutes–hours | Archive, flexible retrieval |
| S3 Glacier Deep Archive | 180 days | Hours | Long-term compliance archive |
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.
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Incident and Event Response — study guide chapter
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Incident and Event Response practice questions
Targeted practice on this topic area only
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AWS Certified DevOps Engineer Professional DOP-C02 study guide
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FAQ
Questions learners often ask
What does this DOP-C02 question test?
Incident and Event Response — This question tests Incident and Event Response — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Amazon S3 server access logs — Option B (Amazon S3 server access logs) is correct because they provide detailed records of each request made to an S3 bucket, including the source IP address and user agent. Option A (VPC Flow Logs) is incorrect because they capture IP traffic metadata (source/destination IP, ports, protocol) but do not include application-level details like the user agent. Option C (AWS CloudTrail) is incorrect because although CloudTrail logs S3 API calls and does include user agent and source IP, S3 server access logs are specifically designed to provide this information and are the recommended source for forensic analysis of S3 access. Option D (Amazon CloudWatch Logs) is incorrect because CloudWatch Logs is a service for storing, monitoring, and accessing log files; it does not generate logs itself but can be used to store and analyze logs from other sources.
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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Last reviewed: Jun 20, 2026
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