Question 35 of 1,711
DEA-C01 Data Security and Governance Practice Question
A data engineer needs to grant cross-account access to an S3 bucket. The engineer wants to use a role in the source account and assume that role from the target account. Which permissions are required?
⚠ Common exam trap
Many exam-takers confuse the direction of the trust policy—thinking the role must be in the target account—or incorrectly assume that a bucket policy alone (without a role) is sufficient for cross-account access, missing the requirement for the target account to authenticate via role assumption.
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
✓
Role in source account with trust policy allowing target account, and bucket policy granting access to the role
Cross-account access via role assumption requires the source account to have an IAM role with a trust policy that explicitly allows the target account's AWS account ID to assume it. The bucket policy must then grant the necessary S3 actions (e.g., s3:GetObject) to that role's ARN, enabling the target account's assumed role session to access the bucket. This two-step mechanism—trust policy for authentication and bucket policy for authorization—is the standard AWS pattern for secure cross-account S3 access.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Role in source account with trust policy allowing target account, and bucket policy granting access to the role
Why this is correct
This is the correct cross-account access pattern using role assumption.
- ✗
Bucket policy in source account allowing the target account's root user
Why it's wrong here
This alone does not allow role assumption; you need IAM role trust policy.
- ✗
Role in target account with trust policy allowing source account
Why it's wrong here
The role should be in the source account, not target.
- ✗
IAM policy in target account allowing s3:GetObject on the bucket
Why it's wrong here
Without assuming a role, the target account cannot directly access the bucket if it's not allowed by bucket policy.
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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Last reviewed: Jul 4, 2026
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.
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