DEA-C01 Data Security and Governance Practice Question
Which TWO actions should a data engineer take to protect sensitive data in an Amazon S3 bucket from being accessed by unauthorized users? (Select TWO.)
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
✓
Add a bucket policy with a Deny effect for unauthorized principals
Options C and E are correct. Option C (bucket policy with Deny effect) explicitly denies access to unauthorized users, preventing unauthorized access. Option E (S3 Block Public Access) prevents public access to the bucket, ensuring it is not publicly accessible. Option A (VPC endpoint) is for network connectivity, not access control. Option B (server access logging) is for auditing, not prevention. Option D (CloudTrail) is for logging and monitoring, not access control.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Create a VPC endpoint for S3
Why it's wrong here
VPC endpoints provide private connectivity, not access control.
- ✗
Enable S3 server access logging
Why it's wrong here
Server access logs are for auditing, not preventing access.
- ✓
Add a bucket policy with a Deny effect for unauthorized principals
Why this is correct
A Deny policy explicitly denies access.
- ✗
Enable AWS CloudTrail for the bucket
Why it's wrong here
CloudTrail logs API calls, it does not prevent access.
- ✓
Enable S3 Block Public Access
Why this is correct
Block Public Access prevents public access to 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 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.