- A
The VPC Flow Logs service is not enabled in the source account.
Why wrong: The VPC Flow Logs service is enabled by default on all VPCs. If it is not enabled, flow logs cannot be created, but the question states that flow logs are not being delivered, not that they cannot be created.
- B
The S3 bucket policy does not grant 's3:PutObject' to the source account.
Why wrong: The bucket policy does grant 's3:PutObject' to the source account? Actually, the policy allows cross-account writes, so this is likely configured correctly.
- C
The source account lacks an IAM role that grants the Flow Logs service permission to write to the central S3 bucket.
The source account needs an IAM role that the Flow Logs service can assume to write to the central S3 bucket. This role must have permissions to write to the S3 bucket and must be trusted by the logging account. Without this role, the flow logs service cannot write cross-account.
- D
The VPC Flow Logs destination is set to CloudWatch Logs instead of S3.
Why wrong: If the destination is set to CloudWatch Logs, then logs would be delivered there, not to S3. But the question states the logs should be published to S3, so this configuration is correct.
ANS-C01 Network Management and Operations Practice Question
This ANS-C01 practice question tests your understanding of network management and operations. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
A company has multiple AWS accounts and wants to centrally manage VPC flow logs for compliance. The logs should be published to a central S3 bucket in the logging account. The logging account has an S3 bucket policy that allows cross-account writes. However, flow logs are not being delivered. What is the most likely missing configuration?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue:
"most likely"Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
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 source account lacks an IAM role that grants the Flow Logs service permission to write to the central S3 bucket.
For cross-account flow log delivery, the source account must have an IAM role that trusts the logging account and allows the flow logs service to assume it. The role must have permissions to write to the S3 bucket. Without this role, logs cannot be delivered.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
The VPC Flow Logs service is not enabled in the source account.
Why it's wrong here
The VPC Flow Logs service is enabled by default on all VPCs. If it is not enabled, flow logs cannot be created, but the question states that flow logs are not being delivered, not that they cannot be created.
- ✗
The S3 bucket policy does not grant 's3:PutObject' to the source account.
Why it's wrong here
The bucket policy does grant 's3:PutObject' to the source account? Actually, the policy allows cross-account writes, so this is likely configured correctly.
- ✓
The source account lacks an IAM role that grants the Flow Logs service permission to write to the central S3 bucket.
Why this is correct
The source account needs an IAM role that the Flow Logs service can assume to write to the central S3 bucket. This role must have permissions to write to the S3 bucket and must be trusted by the logging account. Without this role, the flow logs service cannot write cross-account.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
The VPC Flow Logs destination is set to CloudWatch Logs instead of S3.
Why it's wrong here
If the destination is set to CloudWatch Logs, then logs would be delivered there, not to S3. But the question states the logs should be published to S3, so this configuration is correct.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Detailed technical explanation
How to think about this question
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
KKey Concepts to Remember
- Read the scenario before looking for a memorised answer.
- Find the constraint that changes the correct option.
- Eliminate answers that are true in general but not in this case.
- Use explanations to understand the rule behind the answer.
TExam Day Tips
- Underline the problem statement mentally.
- Watch for words such as best, first, most likely and least administrative effort.
- Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A media company stores terabytes of video archives that are accessed once a year for audit purposes. Moving these objects to a cold storage tier (Azure Archive, S3 Glacier, or Google Nearline) costs a fraction of hot storage. Questions like this test whether you understand storage tiers, access frequency tradeoffs, and retrieval latency requirements.
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 |
What to study next
Got this wrong? Here's your next step.
Identify which ANS-C01 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
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FAQ
Questions learners often ask
What does this ANS-C01 question test?
Network Management and Operations — This question tests Network Management and Operations — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The source account lacks an IAM role that grants the Flow Logs service permission to write to the central S3 bucket. — For cross-account flow log delivery, the source account must have an IAM role that trusts the logging account and allows the flow logs service to assume it. The role must have permissions to write to the S3 bucket. Without this role, logs cannot be delivered.
What should I do if I get this ANS-C01 question wrong?
Identify which ANS-C01 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
Are there clue words in this question I should notice?
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 20, 2026
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.
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