DEA-C01 Data Security and Governance Practice Question
Network Topology
Refer to the exhibit. A data engineer configured CloudTrail to log data events for an S3 bucket. However, the engineer notices that no data events are being logged for objects in the 'logs/' prefix. What is the most likely reason?
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
✓
The S3 bucket policy does not allow CloudTrail to write logs
The data resource value is missing a trailing slash (should be 'logs/')? Actually it has a trailing slash. Wait, the issue is that the ARN is for a prefix, but CloudTrail data event selectors for S3 require a bucket ARN or prefix ARN with a trailing slash. The provided ARN 'arn:aws:s3:::my-bucket/logs/' is correct format. However, the likely issue is that the bucket is in a different region, but the trail is in a different region? No, more common: the IAM role for CloudTrail lacks permissions to log to S3. But the exhibit shows a correct selector. Actually, common mistake: the selector must have a trailing slash, which it does. The most likely cause is that the trail is not logging because the S3 bucket policy does not grant CloudTrail write access. Option A is plausible. Option B is wrong because prefix is correct. Option C is wrong because it includes trailing slash. Option D is wrong because data events are enabled. So option A is correct.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
The S3 bucket policy does not allow CloudTrail to write logs
Why this is correct
CloudTrail needs a bucket policy granting s3:PutObject.
- ✗
The data resource should specify the bucket ARN without a prefix
Why it's wrong here
Prefixes are supported.
- ✗
The prefix 'logs/' must not include a trailing slash
Why it's wrong here
Trailing slash is required.
- ✗
Data events are not supported for S3
Why it's wrong here
They are supported.
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 by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This DEA-C01 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 DEA-C01 exam.