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 AWS CloudTrail is not delivering logs to an S3 bucket. The bucket policy allows CloudTrail access. What is a likely cause of the issue?
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 and the key policy does not grant CloudTrail permission
When an S3 bucket uses SSE-KMS (Server-Side Encryption with AWS KMS), CloudTrail must have explicit permissions in the KMS key policy to decrypt the key and encrypt log files. Even if the S3 bucket policy grants CloudTrail access, the KMS key policy is a separate authorization layer; without a statement allowing CloudTrail to use the kms:GenerateDataKey and kms:Decrypt actions, log delivery will fail silently or with access denied errors.
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 S3 bucket uses SSE-KMS and the key policy does not grant CloudTrail permission
Why this is correct
CloudTrail needs kms:GenerateDataKey and kms:Decrypt permissions.
Related concept
Read the scenario before looking for a memorised answer.
✗
The S3 bucket has a lifecycle policy that deletes objects too quickly
Why it's wrong here
Lifecycle policies do not prevent delivery.
✗
CloudTrail is not enabled in the region
Why it's wrong here
The trail would not be created if not enabled.
✗
The S3 bucket is in a different region than the trail
Why it's wrong here
Cross-region delivery is supported.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates assume the S3 bucket policy is the only authorization layer, overlooking that KMS key policies act as an independent permission boundary when SSE-KMS is used, leading them to choose incorrect options like cross-region or lifecycle issues.
Detailed technical explanation
How to think about this question
Under the hood, CloudTrail uses the KMS key to encrypt log files via GenerateDataKey, and the trail’s S3 bucket must have a KMS key ID specified in the trail configuration. If the KMS key policy lacks a statement granting CloudTrail (as a service principal) permission to use the key, the PutObject call to S3 fails with a 403 AccessDenied error, even if the S3 bucket policy allows s3:PutObject. A real-world scenario is when an organization enables SSE-KMS on the bucket after the trail is created, forgetting to update the key policy, causing logs to stop flowing without obvious S3 bucket policy errors.
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.
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 S3 bucket uses SSE-KMS and the key policy does not grant CloudTrail permission — When an S3 bucket uses SSE-KMS (Server-Side Encryption with AWS KMS), CloudTrail must have explicit permissions in the KMS key policy to decrypt the key and encrypt log files. Even if the S3 bucket policy grants CloudTrail access, the KMS key policy is a separate authorization layer; without a statement allowing CloudTrail to use the kms:GenerateDataKey and kms:Decrypt actions, log delivery will fail silently or with access denied errors.
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.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
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
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
Sign in to join the discussion.