DEA-C01 Data Security and Governance Practice Question
A data engineer is troubleshooting an issue where an IAM role used by AWS Glue cannot read data from an S3 bucket encrypted with SSE-KMS. The bucket policy allows the role to perform s3:GetObject. What additional permission is needed?
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
✓
kms:Decrypt on the KMS key
For SSE-KMS, the IAM role needs kms:Decrypt permission on the KMS key to read encrypted objects. Option A (s3:GetObjectVersion) is not required because the bucket policy already allows s3:GetObject; versioning is not relevant here. Option C (s3:GetObjectAcl) is for access control lists, not encryption. Option D (kms:GenerateDataKey) is used for encrypting new objects, not reading existing ones. Therefore, the correct answer is B.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
s3:GetObjectVersion
Why it's wrong here
Not required for reading current version.
- ✓
kms:Decrypt on the KMS key
Why this is correct
The role must be able to decrypt the S3 object.
- ✗
s3:GetObjectAcl
Why it's wrong here
Not needed for read access.
- ✗
kms:GenerateDataKey on the KMS key
Why it's wrong here
Used for encrypting new objects, not reading.
Visual reference
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
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.