DEA-C01 Data Operations and Support Practice Question

Exhibit

IAM policy attached to an IAM role used by AWS Glue:
{
  "Version": "2012-10-17",
  "Statement": [
    {
      "Effect": "Allow",
      "Action": [
        "s3:GetObject",
        "s3:PutObject"
      ],
      "Resource": "arn:aws:s3:::my-bucket/*"
    },
    {
      "Effect": "Allow",
      "Action": [
        "s3:ListBucket"
      ],
      "Resource": "arn:aws:s3:::my-bucket"
    },
    {
      "Effect": "Allow",
      "Action": [
        "glue:Get*",
        "glue:BatchGet*"
      ],
      "Resource": "*"
    }
  ]
}

A data engineer is troubleshooting an AWS Glue ETL job that fails with an 'Access Denied' error when trying to write to an S3 bucket. The IAM role used by the job has the policy shown in the exhibit. The bucket 'my-bucket' uses S3 default encryption with AWS KMS. What is the most likely missing permission?

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

✓

kms:GenerateDataKey and kms:Decrypt

When an S3 bucket uses AWS KMS for default encryption, any write operation requires the IAM role to have kms:GenerateDataKey and kms:Decrypt permissions on the KMS key. The policy in the exhibit grants s3:PutObject but does not include any KMS actions, resulting in an 'Access Denied' error. Option A (s3:GetObjectVersion) is not needed for writing. Option B (glue:GetObject) is not a valid AWS action. Option C (s3:ListBucketMultipartUploads) is not required for a write operation. Option D (s3:PutObjectAcl) is unnecessary unless the job explicitly sets ACLs.

Answer analysis

Option-by-option breakdown

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

✗
s3:GetObjectVersion
Why it's wrong here
Versioning permission is not needed for writing.
✗
glue:GetObject
Why it's wrong here
glue:GetObject is not a valid IAM action; Glue uses S3 operations.
✗
s3:ListBucketMultipartUploads
Why it's wrong here
Multipart upload listing is not required for writing.
✗
s3:PutObjectAcl
Why it's wrong here
ACL permissions are not required for writing objects.
✓
kms:GenerateDataKey and kms:Decrypt
Why this is correct
KMS permissions are necessary to encrypt and decrypt objects when default encryption uses KMS.

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

DEA-C01 Data Operations and Support Practice Question

Exhibit

Why each option matters

Option-by-option breakdown

AWS S3 Storage Class Comparison

Related to this question