DEA-C01 Data Store Management Practice Question
A company uses Amazon S3 to store images that are accessed by a web application. The application generates presigned URLs for users to download images. Recently, the application has been experiencing errors when generating presigned URLs for objects that were uploaded using multipart upload. The errors indicate that the presigned URL does not work. The data engineer needs to ensure that presigned URLs work for all objects, including those uploaded via multipart upload. What should the data engineer do?
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
✓
Ensure that the IAM user or role used to generate the presigned URL has s3:GetObject permission for the object.
Presigned URLs work regardless of whether the object was uploaded via single-part or multipart upload. The error typically occurs because the IAM user or role used to generate the presigned URL lacks the s3:GetObject permission for the object. Option B is correct. Option A (changing signing algorithm) is unnecessary; SigV4 is the default and works for all cases. Option C (enabling versioning) does not affect presigned URL generation. Option D (re-uploading) is not required as multipart uploads do not break presigned URLs.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Use a different signing algorithm when generating the presigned URL.
Why it's wrong here
SigV4 is standard; changing algorithm is not needed.
- ✓
Ensure that the IAM user or role used to generate the presigned URL has s3:GetObject permission for the object.
Why this is correct
Permissions are required to generate a valid presigned URL.
- ✗
Enable S3 Versioning on the bucket.
Why it's wrong here
Versioning does not affect presigned URL generation.
- ✗
Re-upload the objects using single-part upload instead of multipart upload.
Why it's wrong here
Multipart upload is not the cause; presigned URLs work with multipart uploads.
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
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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.