DEA-C01 Data Security and Governance Practice Question

Exhibit

Refer to the exhibit.

{
  "Version": "2012-10-17",
  "Statement": [
    {
      "Effect": "Deny",
      "Principal": "*",
      "Action": "s3:PutObject",
      "Resource": "arn:aws:s3:::example-bucket/*",
      "Condition": {
        "StringNotEquals": {
          "s3:x-amz-server-side-encryption": "AES256"
        }
      }
    }
  ]
}

Refer to the exhibit. A data engineer applies this S3 bucket policy to the bucket 'example-bucket'. What is the effect of this policy?

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

✓

PutObject requests are denied unless they include the x-amz-server-side-encryption header set to AES256

The policy denies s3:PutObject if the encryption header is not set to AES256 (SSE-S3). It does not enforce a specific KMS key. It allows uploads with SSE-S3. It denies uploads without encryption or with other encryption types.

Answer analysis

Option-by-option breakdown

For each option: why learners choose it and why it is or isn't the right answer here.

✓
PutObject requests are denied unless they include the x-amz-server-side-encryption header set to AES256
Why this is correct
The condition StringNotEquals denies if the header is not AES256, so only requests with AES256 are allowed.
✗
All PutObject requests are denied regardless of encryption
Why it's wrong here
The condition only denies when encryption is not AES256, so requests with AES256 are allowed.
✗
All PutObject requests are allowed only if they use SSE-KMS
Why it's wrong here
The condition requires AES256, which is SSE-S3, not SSE-KMS.
✗
The policy has no effect because it does not allow any action
Why it's wrong here
Deny statements are effective; the policy explicitly denies non-compliant requests.

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

1 more way this is tested on DEA-C01

These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.

Variation 1. Refer to the exhibit. A data engineer attached this S3 bucket policy to the bucket 'example-bucket'. What is the effect of this policy?

hard

A.It allows all PutObject requests that do not use encryption
✓ B.It denies PutObject requests that do not use SSE-S3
C.It denies all PutObject requests unless they use SSE-KMS
D.It denies all PutObject requests from anonymous users

Why B: The bucket policy denies PutObject requests that do not include the x-amz-server-side-encryption header with value AES256 (SSE-S3). This means any PutObject request without SSE-S3 encryption is denied. Therefore, the correct answer is B.

Written by Johnson Ajibi, MSc IT Security

Senior Network & Security Engineer · founder of Courseiva

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