DEA-C01 Data Operations and Support Practice Question
This DEA-C01 practice question tests your understanding of data operations and support. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
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?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
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
Option D is correct because when S3 default encryption uses KMS, the IAM role must have kms:GenerateDataKey and kms:Decrypt permissions on the KMS key. The policy in the exhibit does not include any KMS actions. Option A is wrong because s3:PutObject is already granted. Option B is wrong because s3:GetObject is allowed for reading. Option C is wrong because s3:ListBucket is allowed for listing. Option E is wrong because Glue GetObject is not a valid action.
Key principle: ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement.
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.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Standard ACLs match source addresses.
Common exam traps
Common exam trap: ACLs stop at the first match
ACLs are processed top to bottom. The first matching entry wins, and an implicit deny usually exists at the end.
Detailed technical explanation
How to think about this question
ACL questions test precision: source, destination, protocol, port and direction. A generally correct ACL can still fail if it is applied on the wrong interface or in the wrong direction.
KKey Concepts to Remember
Standard ACLs match source addresses.
Extended ACLs can match source, destination, protocol and ports.
The first matching ACL entry is used.
There is usually an implicit deny at the end.
TExam Day Tips
→Check inbound versus outbound direction.
→Read the ACL from top to bottom.
→Look for a broader permit or deny above the intended line.
Key takeaway
ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement.
Real-world example
How this comes up in practice
A media company stores terabytes of video archives that are accessed once a year for audit purposes. Moving these objects to a cold storage tier (Azure Archive, S3 Glacier, or Google Nearline) costs a fraction of hot storage. Questions like this test whether you understand storage tiers, access frequency tradeoffs, and retrieval latency requirements.
What to study next
Got this wrong? Here's your next step.
Review ACL processing order, placement rules (standard near destination, extended near source), and inbound vs outbound direction. Study wildcard masks and implicit deny. Then practise related DEA-C01 ACL questions on filtering logic and placement.
Data Operations and Support — This question tests Data Operations and Support — Standard ACLs match source addresses..
What is the correct answer to this question?
The correct answer is: kms:GenerateDataKey and kms:Decrypt — Option D is correct because when S3 default encryption uses KMS, the IAM role must have kms:GenerateDataKey and kms:Decrypt permissions on the KMS key. The policy in the exhibit does not include any KMS actions. Option A is wrong because s3:PutObject is already granted. Option B is wrong because s3:GetObject is allowed for reading. Option C is wrong because s3:ListBucket is allowed for listing. Option E is wrong because Glue GetObject is not a valid action.
What should I do if I get this DEA-C01 question wrong?
Review ACL processing order, placement rules (standard near destination, extended near source), and inbound vs outbound direction. Study wildcard masks and implicit deny. Then practise related DEA-C01 ACL questions on filtering logic and placement.
Are there clue words in this question I should notice?
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
What is the key concept behind this question?
Standard ACLs match source addresses.
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