The answer is AWS CloudTrail and S3 server access logs. CloudTrail records all API-level actions against S3, capturing the identity, source IP, and exact API call made, while S3 server access logs provide granular, object-level detail on every HTTP request, including successful and denied reads and writes. Together, they give you both the who and the what: CloudTrail shows the API call that initiated the access, and the server logs reveal the specific objects touched. On the AWS Certified DevOps Engineer Professional DOP-C02 exam, this pairing tests your understanding that CloudTrail covers management-plane events (like PutBucketPolicy) and data-plane API calls, whereas S3 access logs capture data-plane HTTP requests that CloudTrail might not log by default. A common trap is choosing AWS Config, which tracks configuration drift, not access, or GuardDuty, which alerts on threats but doesn’t provide historical logs. Memory tip: think “API trail for the call, access log for the object.”
DOP-C02 Incident and Event Response Practice Question
This DOP-C02 practice question tests your understanding of incident and event response. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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 team is investigating a security incident where an unauthorized user accessed an S3 bucket. The team needs to determine what actions were taken by the user. Which TWO AWS services should be used together to investigate? (Choose TWO.)
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
S3 server access logs
Option A and Option D are correct. CloudTrail logs all API calls to S3, including who made the call, from where, and what action was taken. S3 server access logs provide detailed records of requests made to the bucket, including object-level operations. Option B is wrong because Config records configuration changes, not access. Option C is wrong because GuardDuty detects threats but does not provide detailed logs of past actions. Option E is wrong because CloudWatch metrics provide performance data, not access details.
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.
✓
S3 server access logs
Why this is correct
Server access logs provide detailed records of requests made to the bucket.
Related concept
Read the scenario before looking for a memorised answer.
✗
Amazon CloudWatch metrics
Why it's wrong here
CloudWatch metrics provide performance data, not access details.
✗
AWS Config
Why it's wrong here
Config tracks configuration changes, not access logs.
✓
AWS CloudTrail
Why this is correct
CloudTrail logs API calls to S3, including user identity and actions.
Related concept
Read the scenario before looking for a memorised answer.
✗
Amazon GuardDuty
Why it's wrong here
GuardDuty detects threats but does not provide historical access logs.
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.
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.
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: S3 server access logs — Option A and Option D are correct. CloudTrail logs all API calls to S3, including who made the call, from where, and what action was taken. S3 server access logs provide detailed records of requests made to the bucket, including object-level operations. Option B is wrong because Config records configuration changes, not access. Option C is wrong because GuardDuty detects threats but does not provide detailed logs of past actions. Option E is wrong because CloudWatch metrics provide performance data, not access details.
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 DevOps engineer is investigating a security incident where an unauthorized user accessed an S3 bucket containing sensitive data. The engineer needs to determine what actions the user performed and from which IP address. Which AWS service should be used to retrieve this information?
medium
A.AWS CloudTrail management events.
B.Amazon Inspector findings.
✓ C.Amazon S3 server access logs.
D.Amazon CloudWatch Logs for the S3 bucket.
Why C: Option A is correct because S3 server access logs provide detailed records of requests made to a bucket, including requester, IP address, and action. Option B is wrong because CloudTrail logs API calls made by users or roles, but for S3 object-level operations, it must be specifically enabled for data events. Option C is wrong because CloudWatch Logs can store logs but are not the source of S3 access logs. Option D is wrong because Amazon Inspector is for vulnerability assessments, not logging.
Last reviewed: Jun 20, 2026
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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.
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