ANS-C01 S3 Bucket Policy Practice Question
A company has multiple AWS accounts and wants to centralize VPC flow logs for analysis. The flow logs are published to Amazon S3 in each account. A central account needs to access these logs. Which solution meets the requirements with the least operational overhead?
⚠ Common exam trap
Candidates may mistakenly assume that network connectivity (via Transit Gateway or VPC peering) is required to access S3 buckets across accounts. However, S3 bucket policies can grant cross-account access directly without any network-level configuration.
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
✓
Use S3 bucket policies in each account to grant the central account access
Using S3 bucket policies with cross-account permissions allows the central account to access the flow logs directly from the S3 buckets in each account without additional infrastructure. Option A is incorrect because AWS Glue jobs would add unnecessary operational overhead for copying data. Option B is incorrect because AWS Transit Gateway handles network traffic routing, not S3 access. Option C is incorrect because VPC peering provides network connectivity between VPCs but does not grant access to S3 buckets; S3 access is managed via IAM and bucket policies.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Set up AWS Glue jobs to copy logs to a central S3 bucket
Why it's wrong here
More operational overhead.
- ✗
Use AWS Transit Gateway to centralize network traffic and capture logs
Why it's wrong here
Transit Gateway does not capture flow logs.
- ✗
Use VPC peering to connect the accounts and access the S3 buckets directly
Why it's wrong here
VPC peering does not provide IAM access to S3.
- ✓
Use S3 bucket policies in each account to grant the central account access
Why this is correct
Simplest and most scalable.
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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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This ANS-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 ANS-C01 exam.