The answer is the missing s3:GetBucketAcl permission in the bucket policy. CloudTrail requires this specific action to verify the bucket’s Access Control List before it can deliver log files; without it, the service cannot confirm that the bucket ACL allows the required write access, causing log delivery to fail. On the AWS Certified Security Specialty SCS-C02 exam, this scenario tests your understanding of CloudTrail’s pre-delivery validation checks—a common trap is assuming that only s3:PutObject is needed, but CloudTrail also performs a GetBucketAcl call to inspect the bucket’s ACL settings. Remember that CloudTrail acts as a security auditor itself: it must first “read” the bucket’s ACL before it can “write” logs. A useful memory tip is “Check the ACL before you deliver the log,” or simply think of the mnemonic “Get before Put” for CloudTrail bucket policies.
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.
A security engineer configured the S3 bucket policy shown above for CloudTrail log delivery, but CloudTrail is not delivering logs. 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 policy does not include s3:GetBucketAcl permission.
Option C is correct because the bucket policy must also grant the s3:GetBucketAcl action for CloudTrail to verify the bucket ACL. Option A is wrong because encryption is not required. Option B is wrong because the region is not specified in the policy. Option D is wrong because the resource ARN is correct for CloudTrail logs.
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 policy does not include s3:GetBucketAcl permission.
Why this is correct
CloudTrail needs GetBucketAcl to verify bucket ACL.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Standard ACLs match source addresses.
✗
The bucket is in the wrong region.
Why it's wrong here
Region is not specified in the policy.
✗
The resource ARN is incorrect.
Why it's wrong here
The ARN is correct for CloudTrail logs.
✗
The bucket does not have default encryption enabled.
Why it's wrong here
Encryption is not required for CloudTrail 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 policy does not include s3:GetBucketAcl permission. — Option C is correct because the bucket policy must also grant the s3:GetBucketAcl action for CloudTrail to verify the bucket ACL. Option A is wrong because encryption is not required. Option B is wrong because the region is not specified in the policy. Option D is wrong because the resource ARN is correct for CloudTrail logs.
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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