DEA-C01 Data Security and Governance Practice Question
Exhibit
{
"Version": "2012-10-17",
"Statement": [
{
"Effect": "Deny",
"Principal": "*",
"Action": "s3:PutObject",
"Resource": "arn:aws:s3:::my-bucket/*",
"Condition": {
"StringNotEquals": {
"s3:x-amz-server-side-encryption": "aws:kms"
}
}
},
{
"Effect": "Deny",
"Principal": "*",
"Action": "s3:PutObject",
"Resource": "arn:aws:s3:::my-bucket/*",
"Condition": {
"Null": {
"s3:x-amz-server-side-encryption": "true"
}
}
}
]
}Refer to the exhibit. A data engineer attaches this bucket policy to an S3 bucket. A developer tries to upload an object to the bucket using the AWS CLI with the command: `aws s3 cp file.txt s3://my-bucket/`. The upload fails. What is the most likely reason?
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 CLI command does not specify the encryption header, so the request is denied by the policy
The correct answer. The bucket policy condition `aws:SecureTransport` or similar encryption requirement (e.g., `s3:x-amz-server-side-encryption`) denies requests that do not include the required encryption header. The `aws s3 cp` CLI command does not automatically include the `x-amz-server-side-encryption` header; it uses SSE-S3 by default without setting the header explicitly. Therefore, the request is denied because the header is missing. Option B is incorrect because the policy does not depend on region. Option C is incorrect because the policy does not require a specific KMS key ID; it only requires the encryption header. Option D is incorrect because the IAM user likely has `s3:PutObject` permission, but the bucket policy explicitly denies the request due to missing encryption header.
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 CLI command does not specify the encryption header, so the request is denied by the policy
Why this is correct
The policy denies requests without encryption header.
- ✗
The developer used the wrong AWS region
Why it's wrong here
Region does not affect this policy.
- ✗
The CLI command does not include the required KMS key ID
Why it's wrong here
Policy does not require a specific key ID, just SSE-KMS.
- ✗
The IAM user does not have s3:PutObject permission
Why it's wrong here
Policy does not grant, but it denies if conditions 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
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.