SCS-C02 Data Protection 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 security engineer applies the above bucket policy to an S3 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

✓

All objects must be encrypted with SSE-S3

The policy denies PutObject requests that do not include the x-amz-server-side-encryption header with value AES256, thus enforcing SSE-S3 encryption on all uploads. Therefore, all objects must be encrypted with SSE-S3. Option A is incorrect because the condition is valid. Option B is incorrect because the policy denies unencrypted uploads, preventing objects without encryption headers. Option C is incorrect because the condition specifies AES256 (SSE-S3), not SSE-KMS.

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 has no effect because the condition is invalid
Why it's wrong here
Wrong: The condition is valid and enforces SSE-S3.
✗
Objects without encryption headers are allowed
Why it's wrong here
Wrong: The policy denies requests where encryption is not AES256.
✗
All objects must be encrypted with SSE-KMS
Why it's wrong here
Wrong: The policy specifies AES256, which is SSE-S3, not SSE-KMS.
✓
All objects must be encrypted with SSE-S3
Why this is correct
Correct: The condition requires s3:x-amz-server-side-encryption to be AES256, which is SSE-S3.

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

SCS-C02 Data Protection Practice Question

Exhibit

Why each option matters

Option-by-option breakdown

AWS S3 Storage Class Comparison

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