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Question 1,518 of 1,786

Data Operations and Support →hardMultiple SelectObjective-mapped

Quick Answer

The answer is to check the S3 bucket policy for the staging bucket and ensure it allows the Glue job's IAM role to perform s3:PutObject, along with verifying the IAM role has the necessary permissions and that the Glue service principal is granted write access. This resolves the "S3ServiceException: Access Denied" because AWS Glue requires both the IAM role attached to the job and the S3 bucket policy to explicitly allow the s3:PutObject action; a deny in either will block writes. On the AWS Certified Data Engineer Associate DEA-C01 exam, this scenario tests your understanding of cross-service permission boundaries, where a common trap is to only check the IAM role while forgetting that the S3 bucket policy must also grant access to the role or the Glue service principal. Remember the "double-check" rule: for any S3 write failure, always verify both the IAM role policy and the S3 bucket policy, as a missing bucket policy allow is the most frequent cause. A helpful mnemonic is "Role and Bucket, both must bucket" — meaning both the role and the bucket policy must allow the put action.

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.

A company is using AWS Glue to run ETL jobs that process data from Amazon S3 and load it into Amazon Redshift. The data engineer notices that the Glue job is failing with the error 'S3ServiceException: Access Denied' when writing to the staging S3 bucket. Which THREE actions should the engineer take to resolve this issue?

Question 1hardmulti select

Full question →

A
Ensure that the Glue job script is correctly referencing the S3 bucket path.
Why wrong: Path issues would cause a different error, not an access denied.
B
Verify that the IAM role used by the Glue job has the s3:PutObject permission for the staging bucket.
The role needs write permission to the staging bucket to store temporary files.
C
Ensure that the S3 bucket has a bucket policy that allows the AWS Glue service principal to write objects.
Glue may use its service principal to write to the staging bucket; the bucket policy must allow this.
D
Verify that the IAM role has s3:GetObject permission for the source bucket.
Why wrong: The error is about writing, not reading; read permissions are likely already configured.
E
Check the S3 bucket policy for the staging bucket and ensure it allows the Glue job's IAM role to perform s3:PutObject.
The bucket policy must grant write access to the role's principal.

Full breakdown with real-world context →

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

✓

Verify that the IAM role used by the Glue job has the s3:PutObject permission for the staging bucket.

Options A, C, and E are correct. The IAM role must have s3:PutObject, and also the S3 bucket policy must allow the role's access (option A). Option C is needed for writing temporary files. Option E is needed for the Glue service principal to write to the bucket. Option B is wrong because the error is about write access, not read. Option D is wrong because the error is about the staging bucket, not the Glue job script.

Key principle: NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.

Answer analysis

Option-by-option breakdown

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

✗
Ensure that the Glue job script is correctly referencing the S3 bucket path.
Why it's wrong here
Path issues would cause a different error, not an access denied.
✓
Verify that the IAM role used by the Glue job has the s3:PutObject permission for the staging bucket.
Why this is correct
The role needs write permission to the staging bucket to store temporary files.
Related concept
Static NAT maps one inside address to one outside address.
✓
Ensure that the S3 bucket has a bucket policy that allows the AWS Glue service principal to write objects.
Why this is correct
Glue may use its service principal to write to the staging bucket; the bucket policy must allow this.
Related concept
Static NAT maps one inside address to one outside address.
✗
Verify that the IAM role has s3:GetObject permission for the source bucket.
Why it's wrong here
The error is about writing, not reading; read permissions are likely already configured.
✓
Check the S3 bucket policy for the staging bucket and ensure it allows the Glue job's IAM role to perform s3:PutObject.
Why this is correct
The bucket policy must grant write access to the role's principal.
Related concept
Static NAT maps one inside address to one outside address.

Common exam traps

Common exam trap: NAT rules depend on direction and matching traffic

NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.

Detailed technical explanation

How to think about this question

NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.

KKey Concepts to Remember

Static NAT maps one inside address to one outside address.
PAT allows many inside hosts to share one public address using ports.
Inside local and inside global describe the private and translated addresses.
NAT ACLs identify traffic for translation, not always security filtering.

TExam Day Tips

Identify inside and outside interfaces first.
Check whether the scenario needs static NAT, dynamic NAT or PAT.
Do not confuse NAT matching ACLs with normal packet-filtering intent.

Key takeaway

NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.

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 the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related DEA-C01 NAT questions on configuration and troubleshooting.

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FAQ

Questions learners often ask

What does this DEA-C01 question test?

Data Operations and Support — This question tests Data Operations and Support — Static NAT maps one inside address to one outside address..

What is the correct answer to this question?

The correct answer is: Verify that the IAM role used by the Glue job has the s3:PutObject permission for the staging bucket. — Options A, C, and E are correct. The IAM role must have s3:PutObject, and also the S3 bucket policy must allow the role's access (option A). Option C is needed for writing temporary files. Option E is needed for the Glue service principal to write to the bucket. Option B is wrong because the error is about write access, not read. Option D is wrong because the error is about the staging bucket, not the Glue job script.

What should I do if I get this DEA-C01 question wrong?

What is the key concept behind this question?

Static NAT maps one inside address to one outside address.

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