DEA-C01 SSE-KMS Practice Question
Exhibit
Refer to the exhibit.
```
{
"Version": "2012-10-17",
"Statement": [
{
"Effect": "Allow",
"Action": [
"s3:GetObject",
"s3:PutObject"
],
"Resource": "arn:aws:s3:::data-lake-bucket/*"
},
{
"Effect": "Allow",
"Action": [
"s3:ListBucket"
],
"Resource": "arn:aws:s3:::data-lake-bucket"
},
{
"Effect": "Allow",
"Action": [
"kms:Decrypt"
],
"Resource": "arn:aws:kms:us-east-1:123456789012:key/abc123"
}
]
}
```Refer to the exhibit. An AWS Glue job is failing with 'AccessDenied' when trying to write to the 'data-lake-bucket' which is encrypted with an AWS KMS key. The IAM role used by the Glue job has the attached policy shown. What is the MOST likely cause of the failure?
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 policy does not include kms:GenerateDataKey or kms:Encrypt permission.
The policy allows s3:PutObject but does not include kms:GenerateDataKey or kms:Encrypt permissions, which are required to write to an SSE-KMS encrypted S3 bucket. Option A is incorrect because ListBucket is allowed. Option B is incorrect because GetObject is allowed. Option C is incorrect because the KMS key ARN in the policy is correct; the issue is missing KMS actions.
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 policy does not include s3:ListBucket permission.
Why it's wrong here
ListBucket is explicitly allowed.
- ✗
The policy does not include s3:GetObject permission.
Why it's wrong here
GetObject is allowed.
- ✗
The KMS key ARN in the policy is incorrect.
Why it's wrong here
The ARN format is valid.
- ✓
The policy does not include kms:GenerateDataKey or kms:Encrypt permission.
Why this is correct
Writing to SSE-KMS encrypted S3 requires GenerateDataKey and Encrypt.
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
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