SCS-C02 Security Logging and Monitoring Practice Question
Exhibit
{
"Version": "2012-10-17",
"Statement": [
{
"Effect": "Allow",
"Principal": {
"Service": "cloudtrail.amazonaws.com"
},
"Action": "s3:PutObject",
"Resource": "arn:aws:s3:::my-log-bucket/AWSLogs/123456789012/*",
"Condition": {
"StringEquals": {
"s3:x-amz-acl": "bucket-owner-full-control"
}
}
}
]
}Refer to the exhibit. A security engineer configured the above bucket policy for CloudTrail log delivery. However, logs are not being delivered. What is the most likely cause?
⚠ Common exam trap
Watch out — candidates often assume the 'bucket-owner-full-control' ACL condition is always required for CloudTrail, but it is only needed for cross-account deliveries, not same-account, causing the policy to fail silently.
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 condition requires 'bucket-owner-full-control' ACL, but CloudTrail does not set this ACL when delivering to the same account.
When CloudTrail delivers logs to an S3 bucket in the same AWS account, it does not set the 'bucket-owner-full-control' canned ACL on the objects. The bucket policy condition requiring 's3:x-amz-acl': 'bucket-owner-full-control' will fail, as CloudTrail uses the default ACL (bucket-owner-full-control is only set for cross-account deliveries). This mismatch prevents log delivery.
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 Action should be 's3:PutObjectAcl' instead of 's3:PutObject'.
Why it's wrong here
The action s3:PutObject is correct for uploading objects.
- ✗
The Principal is incorrect; it should be the CloudTrail service principal for the region.
Why it's wrong here
The service principal 'cloudtrail.amazonaws.com' is correct.
- ✓
The condition requires 'bucket-owner-full-control' ACL, but CloudTrail does not set this ACL when delivering to the same account.
Why this is correct
CloudTrail sets the ACL only for cross-account delivery; for same account, the ACL is not set, causing the condition to fail.
- ✗
The Resource ARN is missing the account ID in the path.
Why it's wrong here
The ARN includes the account ID, which is correct.
Visual reference
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 |
Go deeper
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This SCS-C02 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 SCS-C02 exam.