ANS-C01 Network Management and Operations Practice Question
A company has a multi-account AWS environment using AWS Organizations. They want to centralize VPC flow logs from all accounts into a single Amazon S3 bucket in the management account. The management account S3 bucket policy allows the log delivery service to write logs. However, flow logs are failing to deliver from member accounts. What is the most likely reason?
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 S3 bucket policy does not include a principal condition for the member account's log delivery service
The S3 bucket policy must explicitly allow the log delivery service principal (delivery.logs.amazonaws.com) from the member account to write objects. Option A is incorrect because flow logs can be delivered cross-account with proper permissions. Option B is incorrect because the bucket policy is evaluated, not the member account's VPC flow log role. Option D is incorrect because encryption is 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.
- ✗
Flow logs cannot be delivered cross-account; they must be in the same account
Why it's wrong here
Cross-account delivery is supported with proper bucket policies.
- ✗
The member account's IAM role for flow logs does not have permission to write to the bucket
Why it's wrong here
Flow logs use the log delivery service, not the member account's IAM role.
- ✓
The S3 bucket policy does not include a principal condition for the member account's log delivery service
Why this is correct
The bucket policy must allow the log delivery service from the member account.
- ✗
The S3 bucket uses SSE-KMS encryption and the member account does not have access to the KMS key
Why it's wrong here
While KMS can cause issues, the most likely reason is the 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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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.