- A
kms:Encrypt
Why wrong: kms:Encrypt is not required in the key policy; CloudTrail uses the data key generated by GenerateDataKey for encryption.
- B
kms:GenerateDataKey
kms:GenerateDataKey is required as it allows CloudTrail to generate a data key for encrypting log files.
- C
kms:CreateKey
Why wrong: kms:CreateKey is an administrative action not needed for CloudTrail log delivery.
- D
kms:Decrypt
kms:Decrypt is required to allow CloudTrail to decrypt the data key for log file verification.
Question 1,609 of 1,705
ANS-C01 Network Security, Compliance and Governance Practice Question
This ANS-C01 practice question tests your understanding of network security, compliance and governance. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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 security engineer is configuring AWS CloudTrail to log all management events across all regions. The logs must be stored in an S3 bucket that is encrypted with an AWS KMS key. Which bucket policy element is required to allow CloudTrail to write logs?
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
✓
kms:GenerateDataKey
CloudTrail requires both kms:GenerateDataKey and kms:Decrypt permissions in the KMS key policy to deliver logs to an encrypted S3 bucket. kms:GenerateDataKey is used to generate a data key for encrypting the log files, and kms:Decrypt is used to verify the integrity of the data key. Option A (kms:Encrypt) is not required in the key policy because CloudTrail uses the generated data key to encrypt logs. Option C (kms:CreateKey) is a management action not needed for log delivery.
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.
- ✗
kms:Encrypt
Why it's wrong here
kms:Encrypt is not required in the key policy; CloudTrail uses the data key generated by GenerateDataKey for encryption.
- ✓
kms:GenerateDataKey
Why this is correct
kms:GenerateDataKey is required as it allows CloudTrail to generate a data key for encrypting log files.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
kms:CreateKey
Why it's wrong here
kms:CreateKey is an administrative action not needed for CloudTrail log delivery.
- ✓
kms:Decrypt
Why this is correct
kms:Decrypt is required to allow CloudTrail to decrypt the data key for log file verification.
Related concept
Read the scenario before looking for a memorised answer.
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 Security, Compliance and Governance — This question tests Network Security, Compliance and Governance — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: kms:GenerateDataKey — CloudTrail requires both kms:GenerateDataKey and kms:Decrypt permissions in the KMS key policy to deliver logs to an encrypted S3 bucket. kms:GenerateDataKey is used to generate a data key for encrypting the log files, and kms:Decrypt is used to verify the integrity of the data key. Option A (kms:Encrypt) is not required in the key policy because CloudTrail uses the generated data key to encrypt logs. Option C (kms:CreateKey) is a management action not needed for log delivery.
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.
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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