DEA-C01 Data Store Management Practice Question
A data engineer is setting up Amazon S3 bucket policies for a data lake. Which TWO statements are true regarding S3 bucket policies? (Choose TWO.)
⚠ Common exam trap
Many candidates confuse bucket policies with IAM policies, mistakenly thinking the Principal element is optional in bucket policies (it is required), or that bucket policies can target individual objects (they cannot; they use prefix or tag conditions instead).
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
✓
Bucket policies can grant access to accounts in other AWS Organizations
S3 bucket policies can grant cross-account access to principals in other AWS accounts, including those in different AWS Organizations, by specifying the target account ID or organization ID in the Principal element. This enables centralized data lake access management across organizational boundaries without requiring IAM roles or resource-based policies in each account.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Bucket policies can grant access to accounts in other AWS Organizations
Why this is correct
Cross-account access can be granted via bucket policies.
- ✗
Bucket policies are the only way to control access to S3
Why it's wrong here
IAM policies, ACLs, and presigned URLs also control access.
- ✗
Bucket policies can be applied to individual objects
Why it's wrong here
Bucket policies apply to the entire bucket, not individual objects.
- ✗
The Principal element in a bucket policy is optional
Why it's wrong here
Principal is required to specify who gets the permission.
- ✓
Bucket policies are written in JSON format
Why this is correct
AWS policies use JSON syntax.
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.