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.
Refer to the exhibit. A security engineer has created an S3 bucket policy to allow AWS CloudTrail and VPC Flow Logs to deliver logs to the bucket. However, CloudTrail logs are not being delivered, but VPC Flow Logs are delivered successfully. 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 CloudTrail permission to perform 's3:GetBucketAcl' and 's3:PutBucketAcl'.
CloudTrail requires explicit permissions to read the bucket ACL (s3:GetBucketAcl) and set the bucket ACL (s3:PutBucketAcl) to verify and apply the appropriate access control list for log delivery. Without these permissions, CloudTrail cannot confirm it has the necessary write access, causing log delivery to fail. VPC Flow Logs, on the other hand, do not require these ACL operations because they use a different delivery mechanism that relies solely on bucket policies.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
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 principal is set to a service instead of an AWS account.
Why it's wrong here
CloudTrail uses service principal to write logs.
✗
The condition 's3:x-amz-acl' is misspelled.
Why it's wrong here
The condition is correctly spelled.
✗
The service principal in the policy is incorrect for CloudTrail.
Why it's wrong here
The service principal 'cloudtrail.amazonaws.com' is correct.
✓
The bucket policy does not grant CloudTrail permission to perform 's3:GetBucketAcl' and 's3:PutBucketAcl'.
Why this is correct
CloudTrail needs these permissions to verify bucket ownership.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often assume all AWS services require the same set of S3 permissions for log delivery, but CloudTrail uniquely requires s3:GetBucketAcl and s3:PutBucketAcl due to its legacy ACL-based access model, while VPC Flow Logs do not.
Detailed technical explanation
How to think about this question
Under the hood, CloudTrail uses a multi-step verification process: it first calls s3:GetBucketAcl to read the current ACL, then s3:PutBucketAcl to set a bucket ACL that grants the CloudTrail account write access, and finally s3:PutObject to deliver the log file. This ACL-based access control is required because CloudTrail delivers logs on behalf of the customer's AWS account, not the CloudTrail service itself. In contrast, VPC Flow Logs use a direct PutObject call with a bucket policy that grants the delivery.logs.amazonaws.com principal write access, bypassing the need for ACL operations.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
TExam Day Tips
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
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.
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
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Security Logging and Monitoring — This question tests Security Logging and Monitoring — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The bucket policy does not grant CloudTrail permission to perform 's3:GetBucketAcl' and 's3:PutBucketAcl'. — CloudTrail requires explicit permissions to read the bucket ACL (s3:GetBucketAcl) and set the bucket ACL (s3:PutBucketAcl) to verify and apply the appropriate access control list for log delivery. Without these permissions, CloudTrail cannot confirm it has the necessary write access, causing log delivery to fail. VPC Flow Logs, on the other hand, do not require these ACL operations because they use a different delivery mechanism that relies solely on bucket policies.
What should I do if I get this SCS-C02 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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?
Read the scenario before looking for a memorised answer.
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Question Discussion
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