MLS-C01 Data Engineering Practice Question

Exhibit

Refer to the exhibit.

IAM policy attached to an AWS Glue job role:

{
    "Version": "2012-10-17",
    "Statement": [
        {
            "Effect": "Allow",
            "Action": [
                "s3:GetObject",
                "s3:PutObject"
            ],
            "Resource": "arn:aws:s3:::my-data-lake/*"
        },
        {
            "Effect": "Allow",
            "Action": "s3:ListBucket",
            "Resource": "arn:aws:s3:::my-data-lake"
        }
    ]
}

A Glue job fails with an AccessDenied error when trying to write to the S3 bucket my-data-lake. The IAM policy attached to the job role is shown in the exhibit. What is the MOST likely reason for 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 job role does not have permissions to decrypt the KMS key used for server-side encryption

The policy allows s3:PutObject on the bucket, so write access seems granted. However, if the bucket is encrypted with SSE-KMS, the job also needs kms:Decrypt and kms:GenerateDataKey permissions. The policy does not include KMS actions. The bucket policy might also deny, but the most common issue is KMS encryption.

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 s3:ListBucket action is missing on the bucket level
Why it's wrong here
ListBucket is already allowed at the bucket level.
✓
The job role does not have permissions to decrypt the KMS key used for server-side encryption
Why this is correct
SSE-KMS requires kms:Decrypt and kms:GenerateDataKey permissions, which are missing.
✗
The s3:PutObject action is not sufficient; the job needs s3:PutObjectAcl
Why it's wrong here
PutObjectAcl is for setting ACLs, not required for writing.
✗
The resource ARN for s3:PutObject should include a specific prefix
Why it's wrong here
The current ARN allows all objects; a prefix would be more restrictive.

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

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MLS-C01 Data Engineering Practice Question

Exhibit

Why each option matters

Option-by-option breakdown

AWS S3 Storage Class Comparison

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