SCS-C02 Security Logging and Monitoring Practice Question
This SCS-C02 practice question tests your understanding of security logging and monitoring. 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 security engineer is troubleshooting why CloudTrail logs are not being delivered to an S3 bucket. The bucket policy allows CloudTrail to write objects, and the trail is configured to log management events. However, no log files appear in the bucket. 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 S3 bucket uses SSE-KMS encryption and the trail does not have permission to use the KMS key.
Option C is correct because if the S3 bucket is using SSE-KMS encryption, CloudTrail requires explicit permissions to use the KMS key. Option A is wrong because CloudTrail can deliver logs to buckets in different accounts with proper cross-account permissions. Option B is wrong because management events are logged by default. Option D is wrong because the bucket policy is not missing.
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 trail is not logging data events.
Why it's wrong here
Management events are logged by default; this would not prevent delivery.
✓
The S3 bucket uses SSE-KMS encryption and the trail does not have permission to use the KMS key.
Why this is correct
CloudTrail requires kms:Decrypt and kms:GenerateDataKey permissions on the KMS key to deliver logs to an encrypted bucket.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Standard ACLs match source addresses.
✗
The S3 bucket is in a different AWS account.
Why it's wrong here
CloudTrail can deliver to buckets in different accounts with proper cross-account permissions.
✗
The bucket policy is missing a Deny statement.
Why it's wrong here
The bucket policy allows CloudTrail to write; a Deny would block it, but the issue is likely missing KMS permissions.
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 S3 bucket uses SSE-KMS encryption and the trail does not have permission to use the KMS key. — Option C is correct because if the S3 bucket is using SSE-KMS encryption, CloudTrail requires explicit permissions to use the KMS key. Option A is wrong because CloudTrail can deliver logs to buckets in different accounts with proper cross-account permissions. Option B is wrong because management events are logged by default. Option D is wrong because the bucket policy is not missing.
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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Question Discussion
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