DEA-C01 Data Store Management Practice Question
Exhibit
Refer to the exhibit.
{
"Version": "2012-10-17",
"Statement": [
{
"Effect": "Allow",
"Action": [
"s3:GetObject",
"s3:PutObject"
],
"Resource": "arn:aws:s3:::example-bucket/*",
"Condition": {
"StringEquals": {
"s3:x-amz-server-side-encryption": "aws:kms"
}
}
}
]
}An IAM policy is attached to a user who tries to upload an object to the S3 bucket example-bucket using the AWS CLI without specifying the --server-side-encryption flag. What will happen?
⚠ Common exam trap
AWS often tests the misconception that bucket default encryption automatically satisfies an IAM policy requiring encryption headers, but in reality, the policy condition is evaluated first and the request is denied if the header is missing, regardless of the bucket's default encryption setting.
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 upload fails with an AccessDenied error.
The IAM policy denies s3:PutObject unless the request includes the `x-amz-server-side-encryption` header with a value of `AES256`. Since the user did not specify `--server-side-encryption` in the AWS CLI command, the request lacks this required header, causing S3 to evaluate the policy and return an AccessDenied error. The upload fails before any default encryption setting on the bucket is applied.
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 upload fails with an AccessDenied error.
Why this is correct
The condition is not satisfied, so the upload is denied.
- ✗
The upload succeeds and the object is encrypted with SSE-S3 by default.
Why it's wrong here
The condition is not satisfied, so the upload fails.
- ✗
The upload fails because the user does not have permission to use KMS.
Why it's wrong here
The failure is due to the condition not being met, not KMS permissions.
- ✗
The upload succeeds because the policy allows s3:PutObject.
Why it's wrong here
The policy requires the condition, which is not met.
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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