CCSP Cloud Security Operations Practice Question
A security engineer is investigating a potential data exfiltration incident involving an Amazon S3 bucket. Which set of logs would provide the most relevant information to identify the source IP and API calls made to the bucket?
⚠ Common exam trap
The trap is assuming that network-level logs (VPC Flow Logs) or configuration logs (AWS Config) can reveal API-level activity; candidates must remember that only CloudTrail data events capture S3 object-level operations and caller identity.
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
✓
AWS CloudTrail data events for the S3 bucket
AWS CloudTrail data events capture object-level S3 API activity such as GetObject, PutObject, and DeleteObject, including the identity and source IP of the caller. This is exactly the evidence needed to trace who accessed or exfiltrated objects from a specific bucket. Management events alone would not show object reads, so data events must be explicitly enabled for the bucket.
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 for the subnet where the bucket resides
Why it's wrong here
VPC Flow Logs record IP traffic metadata for network interfaces in a subnet, and S3 buckets do not reside in subnets. They are tempting for tracing connections to EC2-hosted services, but S3 API activity and caller identity are captured by CloudTrail data events instead.
- ✗
AWS Config configuration history for the S3 bucket
Why it's wrong here
AWS Config records resource configuration changes and compliance state, not API callers or source IPs. It is tempting because it tracks bucket policy and ACL modifications, but identifying who made API calls to the bucket requires CloudTrail data events, which log the caller identity and IP.
- ✓
AWS CloudTrail data events for the S3 bucket
Why this is correct
CloudTrail data events record object-level S3 API activity, capturing the caller's source IP and the specific operations performed on the bucket. Management events alone omit object-level calls, so data events are required to trace the exfiltration's origin and API sequence.
- ✗
Amazon CloudWatch Logs for the EC2 instance accessing the bucket
Why it's wrong here
CloudWatch Logs capture application or OS-level events from the EC2 instance, not S3 API calls or caller IP addresses. They are tempting when the instance itself is suspect, but identifying who invoked S3 operations requires AWS CloudTrail data events for the bucket.
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 |
Go deeper
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JA
Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed September 2026 · checked against the official ISC2 exam blueprint
This CCSP practice question is part of Courseiva's free ISC2 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 CCSP exam.