This SCS-C02 practice question tests your understanding of threat detection and incident 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 security engineer is investigating a potential compromise of an S3 bucket. The engineer needs to determine if any objects were accessed by an unauthorized user. Which AWS service can provide detailed access logs for S3 objects?
AWS CloudTrail
Why wrong: CloudTrail logs bucket-level API calls; object-level access requires enabling S3 data events, which is not the default.
S3 server access logs
S3 server access logs record object-level access details.
AWS Config
Why wrong: AWS Config records resource configuration changes, not access logs.
Amazon Inspector
Why wrong: Amazon Inspector assesses vulnerabilities, not access logs.
Answer choices
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
S3 server access logs provide detailed records of requests made to an S3 bucket, including the requester, bucket name, request time, action, and response status. This granularity is essential for identifying unauthorized access to specific objects, as it logs every GET, PUT, DELETE, and HEAD request at the object level. AWS CloudTrail, while useful for management events, does not log data-level operations like object reads by default unless data events are explicitly enabled, and even then, it may not capture all object-level access details as comprehensively as server access logs.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
AWS CloudTrail
Why it's wrong here
CloudTrail logs bucket-level API calls; object-level access requires enabling S3 data events, which is not the default.
S3 server access logs
Why this is correct
S3 server access logs record object-level access details.
Related concept
Read the scenario before looking for a memorised answer.
AWS Config
Why it's wrong here
AWS Config records resource configuration changes, not access logs.
Amazon Inspector
Why it's wrong here
Amazon Inspector assesses vulnerabilities, not access logs.
Common exam traps
The trap here is that candidates often assume AWS CloudTrail is sufficient for all logging needs, but the exam specifically tests the distinction between management events (CloudTrail default) and data-level object access logs (S3 server access logs), and that CloudTrail data events require explicit enablement and still lack the granularity of server access logs.
Detailed technical explanation
S3 server access logs are delivered as log files to a target bucket, with each log entry containing fields such as `requester` (IAM user ARN or anonymous), `bucket`, `key`, `operation` (e.g., REST.GET.OBJECT), `http_status`, and `error_code`. These logs are generated asynchronously and can be delayed by up to a few hours, which is critical for incident response timing. In a real-world scenario, an attacker using pre-signed URLs or anonymous access would leave traces in server access logs that CloudTrail might not capture if data events are not enabled or if the attacker uses a different AWS account.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
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
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FAQ
Threat Detection and Incident Response — This question tests Threat Detection and Incident Response — Read the scenario before looking for a memorised answer..
The correct answer is: S3 server access logs — S3 server access logs provide detailed records of requests made to an S3 bucket, including the requester, bucket name, request time, action, and response status. This granularity is essential for identifying unauthorized access to specific objects, as it logs every GET, PUT, DELETE, and HEAD request at the object level. AWS CloudTrail, while useful for management events, does not log data-level operations like object reads by default unless data events are explicitly enabled, and even then, it may not capture all object-level access details as comprehensively as server access logs.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 24, 2026
This SCS-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 SCS-C02 exam.
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