The answer is that the bucket policy does not grant s3:GetBucketAcl to CloudTrail. This is correct because when CloudTrail delivers logs to an S3 bucket, it first verifies bucket ownership by performing a GetBucketAcl call; without this permission, CloudTrail cannot confirm it has write access and will fail to deliver logs, even if the policy allows s3:PutObject. On the AWS Certified Security Specialty SCS-C02 exam, this tests your understanding of CloudTrail’s specific permission requirements beyond basic write access—a common trap is assuming that s3:PutObject alone is sufficient, or confusing this with S3 versioning or encryption settings. Remember that CloudTrail needs both s3:GetBucketAcl and s3:PutObject to function correctly; a helpful memory tip is “Get before Put”—CloudTrail must first get the ACL to verify ownership before it can put any logs.
SCS-C02 Security Logging and Monitoring Practice Question
This SCS-C02 practice question tests your understanding of security logging and monitoring. 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 notices that CloudTrail logs for a production account are not being delivered to the S3 bucket. The bucket policy allows CloudTrail to write objects. 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 does not grant s3:GetBucketAcl to CloudTrail.
Option C is correct because CloudTrail requires specific permissions including s3:GetBucketAcl to verify bucket ownership. Option A is wrong because SSE-S3 is supported. Option B is wrong because S3 versioning is not required. Option D is wrong because CloudTrail can handle existing objects.
Key principle: ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement.
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 S3 bucket does not have versioning enabled.
Why it's wrong here
Versioning is optional for CloudTrail delivery.
✗
The S3 bucket uses SSE-KMS encryption.
Why it's wrong here
CloudTrail supports SSE-KMS with proper KMS key permissions.
✓
The bucket policy does not grant s3:GetBucketAcl to CloudTrail.
Why this is correct
CloudTrail needs GetBucketAcl to verify bucket ownership.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Standard ACLs match source addresses.
✗
The S3 bucket contains existing objects before CloudTrail delivery started.
Why it's wrong here
Existing objects do not prevent delivery.
Common exam traps
Common exam trap: ACLs stop at the first match
ACLs are processed top to bottom. The first matching entry wins, and an implicit deny usually exists at the end.
Detailed technical explanation
How to think about this question
ACL questions test precision: source, destination, protocol, port and direction. A generally correct ACL can still fail if it is applied on the wrong interface or in the wrong direction.
KKey Concepts to Remember
Standard ACLs match source addresses.
Extended ACLs can match source, destination, protocol and ports.
The first matching ACL entry is used.
There is usually an implicit deny at the end.
TExam Day Tips
→Check inbound versus outbound direction.
→Read the ACL from top to bottom.
→Look for a broader permit or deny above the intended line.
Key takeaway
ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement.
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 ACL processing order, placement rules (standard near destination, extended near source), and inbound vs outbound direction. Study wildcard masks and implicit deny. Then practise related SCS-C02 ACL questions on filtering logic and placement.
Security Logging and Monitoring — This question tests Security Logging and Monitoring — Standard ACLs match source addresses..
What is the correct answer to this question?
The correct answer is: The bucket policy does not grant s3:GetBucketAcl to CloudTrail. — Option C is correct because CloudTrail requires specific permissions including s3:GetBucketAcl to verify bucket ownership. Option A is wrong because SSE-S3 is supported. Option B is wrong because S3 versioning is not required. Option D is wrong because CloudTrail can handle existing objects.
What should I do if I get this SCS-C02 question wrong?
Review ACL processing order, placement rules (standard near destination, extended near source), and inbound vs outbound direction. Study wildcard masks and implicit deny. Then practise related SCS-C02 ACL questions on filtering logic and placement.
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?
Standard ACLs match source addresses.
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