DEA-C01 Data Security and Governance Practice Question
A data engineer needs to ensure that an S3 bucket is not publicly accessible. Which S3 block public access setting should be applied to achieve this?
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
✓
BlockPublicPolicy
(BlockPublicPolicy) prevents any public bucket policies from being applied, which is the primary way to grant public access to an S3 bucket. With public ACLs disabled by default for new buckets, blocking public policies effectively ensures the bucket is not publicly accessible. Option A (BlockPublicAcls both new and existing) only blocks public ACLs, leaving the bucket vulnerable to public policies, so it is insufficient by itself.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
BlockPublicAcls (both new and existing)
Why it's wrong here
Incorrect. Blocking public ACLs does not prevent public bucket policies, which can still grant public access.
- ✗
IgnorePublicAcls
Why it's wrong here
Incorrect. IgnorePublicAcls is not a valid block public access setting and would not block public access.
- ✗
BlockPublicAcls (new ACLs)
Why it's wrong here
Incorrect. Blocking only new public ACLs does not address existing ones, leaving potential exposure.
- ✓
BlockPublicPolicy
Why this is correct
Correct. BlockPublicPolicy prevents public bucket policies, the most common vector for public access, especially with ACLs disabled by default.
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 |
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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