The correct answers are enabling S3 Object Lock on the destination bucket and using AWS KMS with a customer managed key, because together they enforce immutability and encryption for centralized logging. S3 Object Lock prevents log files from being deleted or overwritten by applying a retention mode like Governance or Compliance, while a customer managed KMS key provides granular access control and encryption at rest, ensuring that even if an attacker gains bucket access, they cannot read or tamper with the logs. On the AWS Certified Security Specialty SCS-C02 exam, this scenario tests your ability to distinguish between security controls that prevent deletion (Object Lock) versus those that only verify integrity (CloudTrail log file validation) or add authentication (MFA Delete). A common trap is confusing MFA Delete with immutability—remember that MFA Delete protects against accidental deletion but does not enforce a retention period, whereas Object Lock enforces a write-once-read-many (WORM) model. Memory tip: “Lock it, key it, log it—Object Lock for immutability, KMS for secrecy.”
SCS-C02 Security Logging and Monitoring Practice Question
This SCS-C02 practice question tests your understanding of security logging and monitoring. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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 implementing centralized logging across multiple AWS accounts. Which TWO actions should the engineer take to ensure logs are securely stored and immutable? (Choose TWO.)
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
Option A is correct because enabling S3 Object Lock prevents log files from being deleted or overwritten. Option C is correct because using AWS KMS with a customer managed key provides encryption and fine-grained access control. Option B is wrong because CloudTrail log file validation ensures integrity but does not prevent deletion. Option D is wrong because S3 Transfer Acceleration is for speed, not security. Option E is wrong because MFA Delete requires additional authentication but does not provide immutability; Object Lock is more appropriate.
Key principle: NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
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.
Related concept
Static NAT maps one inside address to one outside address.
✓
Enable S3 Object Lock on the destination bucket
Why this is correct
Object Lock prevents log files from being deleted or overwritten.
Related concept
Static NAT maps one inside address to one outside address.
✗
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.
Common exam traps
Common exam trap: NAT rules depend on direction and matching traffic
NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.
Detailed technical explanation
How to think about this question
NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.
KKey Concepts to Remember
Static NAT maps one inside address to one outside address.
PAT allows many inside hosts to share one public address using ports.
Inside local and inside global describe the private and translated addresses.
NAT ACLs identify traffic for translation, not always security filtering.
TExam Day Tips
→Identify inside and outside interfaces first.
→Check whether the scenario needs static NAT, dynamic NAT or PAT.
→Do not confuse NAT matching ACLs with normal packet-filtering intent.
Key takeaway
NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
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 the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related SCS-C02 NAT questions on configuration and troubleshooting.
Security Logging and Monitoring — This question tests Security Logging and Monitoring — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: Use AWS KMS with a customer managed key for encryption — Option A is correct because enabling S3 Object Lock prevents log files from being deleted or overwritten. Option C is correct because using AWS KMS with a customer managed key provides encryption and fine-grained access control. Option B is wrong because CloudTrail log file validation ensures integrity but does not prevent deletion. Option D is wrong because S3 Transfer Acceleration is for speed, not security. Option E is wrong because MFA Delete requires additional authentication but does not provide immutability; Object Lock is more appropriate.
What should I do if I get this SCS-C02 question wrong?
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related SCS-C02 NAT questions on configuration and troubleshooting.
What is the key concept behind this question?
Static NAT maps one inside address to one outside address.
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Question Discussion
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