The answer is a missing bucket policy on the destination S3 bucket that grants CloudTrail the s3:PutObject permission. Even when you configure CloudTrail to log data events for all S3 buckets, the service still needs explicit write access to the bucket where it delivers those log files; without this policy, CloudTrail cannot write logs for any bucket, causing some or all data event logs to go missing. On the AWS Certified SysOps Administrator Associate SOA-C02 exam, this scenario tests your understanding that enabling data event logging in the trail settings is not enough—the destination bucket’s resource-based policy must explicitly allow CloudTrail’s service principal to perform the s3:PutObject action. A common trap is assuming that selecting “All buckets” automatically grants permissions, but CloudTrail operates as a separate AWS service that requires its own authorization. Remember the mnemonic: “Trail writes, bucket permits”—the trail configuration starts the logging, but the bucket policy must permit the write.
SOA-C02 Monitoring, Logging, and Remediation Practice Question
This SOA-C02 practice question tests your understanding of monitoring, logging, and remediation. 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 SysOps administrator needs to ensure that all S3 buckets in the account are logged to CloudTrail for data events. The administrator enables CloudTrail with data events for S3 and selects 'All buckets' in the current account. However, after a week, they notice that some buckets are not being logged. What is the most likely reason?
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 S3 buckets do not have a bucket policy that allows CloudTrail to write the log files.
When CloudTrail delivers S3 data event logs to a destination bucket, it writes log files on behalf of the trail. Even if the trail is configured to log data events for 'All buckets,' CloudTrail must have explicit permissions to write to the destination bucket. The destination bucket requires a bucket policy that grants CloudTrail the s3:PutObject action; without this policy, CloudTrail cannot deliver logs for any bucket, including those being monitored. Option B correctly identifies this missing bucket policy as the most likely reason some buckets are not logged.
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 IAM user who created the trail does not have s3:PutObject permissions on the buckets.
Why it's wrong here
CloudTrail uses its own service account to write logs.
✓
The S3 buckets do not have a bucket policy that allows CloudTrail to write the log files.
Why this is correct
Without the appropriate bucket policy, CloudTrail cannot deliver logs to the target bucket.
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 S3 buckets are in a different AWS Region from the CloudTrail trail.
Why it's wrong here
CloudTrail can log events from any region.
✗
The S3 buckets have server access logging enabled, which conflicts with CloudTrail logging.
Why it's wrong here
Server access logging is independent.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates assume enabling CloudTrail with 'All buckets' automatically grants write permissions, but they overlook the critical requirement of a bucket policy on the destination bucket that explicitly allows CloudTrail to deliver logs.
Detailed technical explanation
How to think about this question
CloudTrail uses a service principal (cloudtrail.amazonaws.com) to write log files to the destination S3 bucket. The bucket policy must include a statement allowing this principal to perform s3:PutObject and s3:GetBucketAcl actions, typically with a condition that restricts access to the trail's S3 key prefix. A common real-world scenario is when the destination bucket is in a different account or has a restrictive default bucket policy that blocks CloudTrail writes, causing silent log delivery failures.
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.
TExam Day Tips
→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 exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Monitoring, Logging, and Remediation — This question tests Monitoring, Logging, and Remediation — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The S3 buckets do not have a bucket policy that allows CloudTrail to write the log files. — When CloudTrail delivers S3 data event logs to a destination bucket, it writes log files on behalf of the trail. Even if the trail is configured to log data events for 'All buckets,' CloudTrail must have explicit permissions to write to the destination bucket. The destination bucket requires a bucket policy that grants CloudTrail the s3:PutObject action; without this policy, CloudTrail cannot deliver logs for any bucket, including those being monitored. Option B correctly identifies this missing bucket policy as the most likely reason some buckets are not logged.
What should I do if I get this SOA-C02 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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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