Question 1,172 of 318
SCS-C02 Security Logging and Monitoring Practice Question
A security engineer is implementing centralized logging across multiple AWS accounts. Which TWO actions should the engineer take to ensure logs are securely stored and immutable? (Choose TWO.)
⚠ Common exam trap
Many candidates confuse CloudTrail log file validation (which only detects tampering) with immutability (which prevents tampering), or they mistakenly think MFA Delete provides the same WORM protection as S3 Object Lock.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Use AWS KMS with a customer managed key for encryption
Using AWS KMS with a customer managed key (CMK) for encryption ensures that the security engineer has full control over the encryption keys, including key rotation, access policies, and the ability to disable or revoke the key. This prevents unauthorized decryption of logs, even by AWS, and is a critical component of securing log data at rest. Option C is correct because enabling S3 Object Lock on the destination bucket enforces a write-once-read-many (WORM) model, preventing logs from being deleted or overwritten for a specified retention period, which ensures immutability and compliance with regulatory requirements.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Enable S3 Transfer Acceleration on the bucket
Why it's wrong here
Transfer Acceleration is for faster uploads, not security.
- ✓
Use AWS KMS with a customer managed key for encryption
Why this is correct
KMS provides encryption and access control.
- ✓
Enable S3 Object Lock on the destination bucket
Why this is correct
Object Lock prevents log files from being deleted or overwritten.
- ✗
Enable CloudTrail log file validation
Why it's wrong here
Log file validation ensures integrity but does not prevent deletion.
- ✗
Enable MFA Delete on the bucket
Why it's wrong here
MFA Delete requires additional authentication but does not provide immutability.
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 |
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Last reviewed: Jul 4, 2026
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.
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