The correct actions are enabling CloudTrail log file validation and enabling SSE-KMS encryption. Log file validation provides integrity by generating a digest file that allows you to confirm that logs have not been modified, deleted, or tampered with after delivery, while SSE-KMS protects the logs at rest by encrypting them with a customer-managed KMS key, ensuring unauthorized access is blocked even if the S3 bucket is compromised. On the AWS Certified Security Specialty SCS-C02 exam, this pairing tests your understanding of defense-in-depth for audit logs—a common trap is confusing S3 Versioning or MFA Delete with integrity validation, but versioning alone does not prevent log tampering, and MFA is not a native CloudTrail feature. Remember the mnemonic “KMS for keys, validation for value”—SSE-KMS secures the encryption keys, and log file validation ensures the logs’ trustworthiness.
SCS-C02 Infrastructure Security Practice Question
This SCS-C02 practice question tests your understanding of infrastructure security. 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 company is using AWS CloudTrail to log API calls. The security team wants to ensure that the logs are protected from unauthorized access and deletion. Which TWO actions should be taken?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Enable server-side encryption using AWS KMS (SSE-KMS) on the S3 bucket.
Option A (enable log file validation) ensures integrity, and Option C (enable SSE-KMS) ensures encryption at rest. Option B is wrong because MFA is not a native CloudTrail feature. Option D is wrong because S3 Versioning helps but does not prevent deletion of the bucket. Option E is wrong because S3 ACLs are not the best practice; bucket policies are preferred.
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 server-side encryption using AWS KMS (SSE-KMS) on the S3 bucket.
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.
Infrastructure Security — This question tests Infrastructure Security — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: Enable server-side encryption using AWS KMS (SSE-KMS) on the S3 bucket. — Option A (enable log file validation) ensures integrity, and Option C (enable SSE-KMS) ensures encryption at rest. Option B is wrong because MFA is not a native CloudTrail feature. Option D is wrong because S3 Versioning helps but does not prevent deletion of the bucket. Option E is wrong because S3 ACLs are not the best practice; bucket policies are preferred.
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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