The answer is to enable CloudTrail log file integrity validation. This feature works by generating a SHA-256 hash of each log file and then creating a digital signature using the private key of a public-private key pair, which CloudTrail publishes to a publicly accessible location. When you later digest the log files, CloudTrail recalculates the hash and verifies the signature against the public key, confirming that the log files have not been altered, deleted, or modified since delivery. On the AWS Certified Security Specialty SCS-C02 exam, this question tests your understanding of detective controls versus preventive controls—common traps include confusing integrity validation with encryption (SSE-S3) or object versioning, which protect confidentiality or availability but not tamper detection. Remember the memory tip: "Integrity needs a hash and a signature, not just a lock or a key."
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 company uses AWS CloudTrail to log all API calls in their AWS account. They need to ensure that log files are not tampered with after they are delivered to the S3 bucket. Which feature should be enabled to provide integrity validation?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Enable CloudTrail log file integrity validation.
Option B is correct because CloudTrail log file integrity validation uses SHA-256 hashing and digital signatures to verify that log files have not been altered. Option A is incorrect because server-side encryption (SSE-S3) only encrypts data at rest, not integrity. Option C is incorrect because S3 Versioning helps preserve object versions but does not validate integrity. Option D is incorrect because S3 Object Lock prevents deletion but not modification detection.
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 Versioning on the CloudTrail bucket.
Why it's wrong here
Versioning preserves versions but does not validate integrity.
✗
Enable S3 server-side encryption with SSE-S3.
Why it's wrong here
SSE-S3 only provides encryption, not integrity validation.
✓
Enable CloudTrail log file integrity validation.
Why this is correct
This feature provides cryptographic verification of log file integrity.
Related concept
Static NAT maps one inside address to one outside address.
✗
Enable S3 Object Lock on the CloudTrail bucket.
Why it's wrong here
Object Lock prevents deletion but does not detect modification.
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: Enable CloudTrail log file integrity validation. — Option B is correct because CloudTrail log file integrity validation uses SHA-256 hashing and digital signatures to verify that log files have not been altered. Option A is incorrect because server-side encryption (SSE-S3) only encrypts data at rest, not integrity. Option C is incorrect because S3 Versioning helps preserve object versions but does not validate integrity. Option D is incorrect because S3 Object Lock prevents deletion but not modification detection.
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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