The answer is the condition requiring the bucket-owner-full-control ACL, because CloudTrail does not set this ACL when delivering logs to the same AWS account. The bucket policy explicitly demands the s3:x-amz-acl header be set to bucket-owner-full-control, but CloudTrail only applies that canned ACL when delivering to a different account; for same-account delivery, it omits the ACL entirely, causing the policy condition to fail and logs to be denied. On the AWS Certified Security Specialty SCS-C02 exam, this scenario tests your understanding of how CloudTrail’s ACL behavior differs between cross-account and same-account delivery—a common trap is assuming the ACL is always applied. Remember the memory tip: “Same account, no ACL; cross account, full control.”
SCS-C02 Security Logging and Monitoring Practice Question
This SCS-C02 practice question tests your understanding of security logging and monitoring. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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.
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?
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 condition requires 'bucket-owner-full-control' ACL, but CloudTrail does not set this ACL when delivering to the same account.
The bucket policy requires the 'bucket-owner-full-control' canned ACL, but CloudTrail by default uses 'bucket-owner-full-control' only when delivering to a different account. For same-account delivery, the ACL is not set, causing a mismatch. Option A is wrong because the principal is correct. Option B is wrong because the resource ARN is correct. Option D is wrong because the action is correct.
Key principle: NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
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.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Static NAT maps one inside address to one outside address.
✗
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.
Common exam traps
Common exam trap: NAT rules depend on direction and matching traffic
NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.
Detailed technical explanation
How to think about this question
NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.
KKey Concepts to Remember
Static NAT maps one inside address to one outside address.
PAT allows many inside hosts to share one public address using ports.
Inside local and inside global describe the private and translated addresses.
NAT ACLs identify traffic for translation, not always security filtering.
TExam Day Tips
→Identify inside and outside interfaces first.
→Check whether the scenario needs static NAT, dynamic NAT or PAT.
→Do not confuse NAT matching ACLs with normal packet-filtering intent.
Key takeaway
NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
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.
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related SCS-C02 NAT questions on configuration and troubleshooting.
Security Logging and Monitoring — This question tests Security Logging and Monitoring — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: The condition requires 'bucket-owner-full-control' ACL, but CloudTrail does not set this ACL when delivering to the same account. — The bucket policy requires the 'bucket-owner-full-control' canned ACL, but CloudTrail by default uses 'bucket-owner-full-control' only when delivering to a different account. For same-account delivery, the ACL is not set, causing a mismatch. Option A is wrong because the principal is correct. Option B is wrong because the resource ARN is correct. Option D is wrong because the action is correct.
What should I do if I get this SCS-C02 question wrong?
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related SCS-C02 NAT questions on configuration and troubleshooting.
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?
Static NAT maps one inside address to one outside address.
About these practice questions
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These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. A security engineer is configuring a multi-account CloudTrail setup. The above bucket policy is attached to the central logging bucket. Despite the policy, CloudTrail in the member account (123456789012) cannot deliver logs. What is the MOST likely issue?
easy
A.The Principal should be the CloudTrail service principal of the member account.
✓ B.The condition s3:x-amz-acl is not required; CloudTrail does not set that ACL.
C.The Action should be s3:PutObjectAcl instead of s3:PutObject.
D.The resource ARN must include the source account ID in the path.
Why B: Option B is correct because the resource path includes the account ID, but the condition requires the ACL to be set to bucket-owner-full-control, which CloudTrail does not set by default. Option A is wrong because the principal is correct. Option C is wrong because the bucket policy does not need to specify the source account explicitly; the path includes it. Option D is wrong because the action is correct.
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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.
Question Discussion
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