DEA-C01 Data Operations and Support Practice Question
Exhibit
Refer to the exhibit. 2024-03-15 10:23:45,678 ERROR [main] com.amazonaws.services.s3.AmazonS3Client : Unable to execute HTTP request: Connect to my-bucket.s3.us-west-2.amazonaws.com:443 [my-bucket.s3.us-west-2.amazonaws.com/10.0.0.1] failed: connect timed out
Refer to the exhibit. A data engineer sees this error log from an Amazon EC2 instance that is trying to access an S3 bucket in the us-west-2 region. The EC2 instance is in a VPC with a private subnet and no internet gateway. What is the MOST likely cause of this error?
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 VPC does not have a VPC endpoint for S3.
The EC2 instance is in a private subnet without an internet gateway, so it cannot reach S3 over the internet. A VPC endpoint (Gateway or Interface) for S3 is required for private connectivity. The error log shows a connection timeout, which is consistent with the lack of a VPC endpoint. Option A is incorrect because the bucket's region is us-west-2 as specified, and the bucket exists (DNS resolves). Option C is incorrect because the error is a timeout, not a 404 (bucket not found). Option D is incorrect because the error is a connection timeout, not an access denied (403), so IAM permissions are not the issue.
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 bucket is in a different region than us-west-2.
Why it's wrong here
The error shows us-west-2 endpoint.
- ✓
The VPC does not have a VPC endpoint for S3.
Why this is correct
Private subnet needs VPC endpoint to access S3.
- ✗
The S3 bucket does not exist.
Why it's wrong here
DNS resolves, so bucket exists.
- ✗
The IAM role attached to the EC2 instance does not have s3:GetObject permission.
Why it's wrong here
Permission errors return 403, not timeout.
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 |
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This DEA-C01 practice question is part of Courseiva's free Amazon Web Services certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the DEA-C01 exam.