The answer is that CloudTrail delivery fails because the bucket policy requires the x-amz-server-side-encryption header with value AES256, but CloudTrail does not include this header in its PutObject requests. While CloudTrail uses SSE-S3 encryption by default for log delivery, it does not explicitly send the encryption header, so the bucket policy’s deny condition blocks the request. This scenario tests your understanding of how S3 bucket policy conditions interact with AWS service behavior, a common trap on the AWS Certified SysOps Administrator Associate SOA-C02 exam where candidates mistakenly assume default encryption settings satisfy policy requirements. The key distinction is that default encryption applies server-side when no header is present, but a policy requiring the header evaluates the request before encryption is applied. Remember: a bucket policy that demands a specific header overrides any default encryption setting, so CloudTrail’s omission of that header causes the deny. For the exam, think “header required, header missing” to avoid this trap.
SOA-C02 Security and Compliance Practice Question
This SOA-C02 practice question tests your understanding of security and compliance. 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 uses AWS CloudTrail to log all API calls. The security team requires that all logs be encrypted at rest and stored in an S3 bucket that blocks public access. The SysOps administrator configures the bucket with default encryption (SSE-S3) and a bucket policy that denies all actions unless the request includes the x-amz-server-side-encryption header with value AES256. However, CloudTrail delivery fails. What is the MOST likely cause?
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 the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The bucket policy requires the x-amz-server-side-encryption header, but CloudTrail does not include this header
Option C is correct because CloudTrail delivers logs using SSE-S3 by default, but it does not include the x-amz-server-side-encryption header in the PutObject requests. The bucket policy requires that header, so the requests are denied. Option A is incorrect because CloudTrail can deliver to buckets with default encryption. Option B is incorrect because the bucket policy does not need to allow CloudTrail explicitly; the service has permissions via the trail's bucket policy. Option D is incorrect because SSE-S3 is supported by CloudTrail.
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 bucket policy requires the x-amz-server-side-encryption header, but CloudTrail does not include this header
Why this is correct
CloudTrail uses SSE-S3 automatically but does not set the header; the policy denies the request.
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.
✗
CloudTrail does not support SSE-S3 encryption
Why it's wrong here
CloudTrail supports SSE-S3.
✗
The bucket policy does not grant CloudTrail the s3:PutObject permission
Why it's wrong here
CloudTrail uses a separate bucket policy to grant access.
✗
The bucket has default encryption enabled, which conflicts with CloudTrail's encryption
Why it's wrong here
Default encryption is compatible with CloudTrail.
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.
What to study next
Got this wrong? Here's your next step.
Identify which SOA-C02 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.
Security and Compliance — This question tests Security and Compliance — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The bucket policy requires the x-amz-server-side-encryption header, but CloudTrail does not include this header — Option C is correct because CloudTrail delivers logs using SSE-S3 by default, but it does not include the x-amz-server-side-encryption header in the PutObject requests. The bucket policy requires that header, so the requests are denied. Option A is incorrect because CloudTrail can deliver to buckets with default encryption. Option B is incorrect because the bucket policy does not need to allow CloudTrail explicitly; the service has permissions via the trail's bucket policy. Option D is incorrect because SSE-S3 is supported by CloudTrail.
What should I do if I get this SOA-C02 question wrong?
Identify which SOA-C02 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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Question Discussion
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