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Data Operations and Support →hardMultiple ChoiceObjective-mapped

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.

Your company runs a critical data processing pipeline that ingests data from multiple sources into an Amazon S3 bucket. An AWS Glue ETL job processes this data and writes the output to an Amazon Redshift cluster. The pipeline is triggered by an S3 event notification that invokes an AWS Lambda function, which starts the Glue job. Recently, you have observed that the Glue job occasionally fails with an AccessDenied error when trying to access the S3 bucket. The IAM role used by the Glue job has the following policy: { "Version": "2012-10-17", "Statement": [ { "Effect": "Allow", "Action": [ "s3:GetObject", "s3:ListBucket" ], "Resource": [ "arn:aws:s3:::input-bucket", "arn:aws:s3:::input-bucket/*" ] }, { "Effect": "Allow", "Action": [ "redshift:CopyData" ], "Resource": "*" } ] }. The S3 bucket has a bucket policy that allows access only from a specific VPC. The Glue job runs in a VPC with the appropriate VPC endpoints configured. The error occurs intermittently and sometimes retries succeed. What is the most likely cause and correct course of action?

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.

A
Add a VPC endpoint for S3 and configure the bucket policy to allow access from the Glue job's VPC endpoint.
This ensures requests from Glue are routed through the VPC endpoint and comply with the bucket policy.
B
Ensure the Glue job's VPC configuration includes a NAT gateway to route traffic to S3.
Why wrong: A NAT gateway would route traffic through the internet, but the bucket policy requires VPC endpoint access.
C
Change the Lambda function to use a different IAM role with broader S3 permissions.
Why wrong: The Lambda function triggers the Glue job; it does not access S3. The error is from the Glue job.
D
Modify the Glue job's IAM role to include s3:PutObject permission for the output bucket.
Why wrong: The error is AccessDenied on the input bucket, not output. Also, the bucket policy is the likely cause.

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

✓

Add a VPC endpoint for S3 and configure the bucket policy to allow access from the Glue job's VPC endpoint.

The correct answer is A. The Glue job intermittently fails with AccessDenied when accessing the S3 bucket because the bucket policy restricts access to requests originating from a specific VPC endpoint. Although the Glue job runs in a VPC, it does not automatically route S3 traffic through the VPC endpoint; it may use the internet or a different endpoint. The intermittent success occurs when requests happen to come from the allowed endpoint. To resolve this, ensure the Glue job's VPC configuration includes a VPC endpoint for S3, and update the bucket policy to allow access from that endpoint. Option B is incorrect because a NAT gateway would route traffic through the internet, which may be denied by the bucket policy. Option C is incorrect because the Lambda function's IAM role does not affect the Glue job's access. Option D is incorrect because the error is about reading from the input bucket, not writing to the output bucket, and the IAM role already has the necessary S3 permissions.

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.

✓
Add a VPC endpoint for S3 and configure the bucket policy to allow access from the Glue job's VPC endpoint.
Why this is correct
This ensures requests from Glue are routed through the VPC endpoint and comply with the bucket policy.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Static NAT maps one inside address to one outside address.
✗
Ensure the Glue job's VPC configuration includes a NAT gateway to route traffic to S3.
Why it's wrong here
A NAT gateway would route traffic through the internet, but the bucket policy requires VPC endpoint access.
✗
Change the Lambda function to use a different IAM role with broader S3 permissions.
Why it's wrong here
The Lambda function triggers the Glue job; it does not access S3. The error is from the Glue job.
✗
Modify the Glue job's IAM role to include s3:PutObject permission for the output bucket.
Why it's wrong here
The error is AccessDenied on the input bucket, not output. Also, the bucket policy is the likely cause.

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.

Trap categories for this question

Command / output trap
The error is AccessDenied on the input bucket, not output. Also, the bucket policy is the likely cause.

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.

Visual reference

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

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: Add a VPC endpoint for S3 and configure the bucket policy to allow access from the Glue job's VPC endpoint. — The correct answer is A. The Glue job intermittently fails with AccessDenied when accessing the S3 bucket because the bucket policy restricts access to requests originating from a specific VPC endpoint. Although the Glue job runs in a VPC, it does not automatically route S3 traffic through the VPC endpoint; it may use the internet or a different endpoint. The intermittent success occurs when requests happen to come from the allowed endpoint. To resolve this, ensure the Glue job's VPC configuration includes a VPC endpoint for S3, and update the bucket policy to allow access from that endpoint. Option B is incorrect because a NAT gateway would route traffic through the internet, which may be denied by the bucket policy. Option C is incorrect because the Lambda function's IAM role does not affect the Glue job's access. Option D is incorrect because the error is about reading from the input bucket, not writing to the output bucket, and the IAM role already has the necessary S3 permissions.

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

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?

Static NAT maps one inside address to one outside address.

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