Question 158 of 1,711
DEA-C01 SSE-KMS Practice Question
An organization is using AWS Glue to process sensitive data. The data is stored in S3 with server-side encryption using AWS KMS (SSE-KMS). The Glue job fails with an error indicating that it cannot read the data. The IAM role used by Glue has the following policy. What is missing?
⚠ Common exam trap
Candidates often assume that both s3:GetObject and kms:Decrypt are missing, but the question's context implies that s3:GetObject is already present. The trap is to overlook that the IAM policy already includes s3:GetObject, so only kms:Decrypt needs to be added.
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 kms:Decrypt permission on the KMS key
The Glue job fails because the IAM role lacks the kms:Decrypt permission on the KMS key. While s3:GetObject is also required, the role already has that permission (or it is not the missing permission causing the error). The key missing permission for decrypting SSE-KMS encrypted data is kms:Decrypt. Option A is incorrect because s3:GetObject is present. Option B is correct. Options C and D are incorrect because they are not required for read operations.
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:GetObject permission on the bucket
Why it's wrong here
Incorrect. The role has s3:GetObject permission; the missing permission is kms:Decrypt.
- ✓
The kms:Decrypt permission on the KMS key
Why this is correct
Correct. The role lacks kms:Decrypt, which is required to decrypt objects encrypted with SSE-KMS.
- ✗
The kms:GenerateDataKey permission on the KMS key
Why it's wrong here
Incorrect. kms:GenerateDataKey is used for encryption, not decryption.
- ✗
The kms:ReEncrypt permission on the KMS key
Why it's wrong here
Incorrect. kms:ReEncrypt is not needed for reading data.
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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Last reviewed: Jun 20, 2026
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.
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