The correct combination is S3 server-side encryption and CloudTrail log file validation. S3 server-side encryption, whether using SSE-S3 or SSE-KMS, ensures that all CloudTrail logs are encrypted at rest within the S3 bucket, directly addressing the encryption requirement. CloudTrail log file validation then provides integrity by generating a hash digest for each log file, which can be used to detect any tampering or unauthorized modifications after delivery. On the AWS Certified Advanced Networking Specialty ANS-C01 exam, this question tests your understanding of how encryption and integrity are separate concerns—a common trap is confusing KMS encryption with integrity checks, or assuming that bucket policies alone provide security. Remember that encryption handles confidentiality, while log file validation handles integrity; a useful mnemonic is “SSE for secrecy, validation for verification.”
ANS-C01 Network Security, Compliance and Governance Practice Question
This ANS-C01 practice question tests your understanding of network security, compliance and governance. 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. They want to ensure that log files are encrypted at rest and that any tampering with logs is detectable. Which combination of services should they use?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
S3 server-side encryption and CloudTrail log file validation
Option A is correct because S3 server-side encryption (SSE-S3 or SSE-KMS) encrypts logs at rest, and CloudTrail log file validation provides integrity verification. Option B (KMS with CloudWatch) does not provide integrity. Option C (IAM roles) is not relevant. Option D (S3 bucket policies) does not encrypt or validate.
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.
✓
S3 server-side encryption and CloudTrail log file validation
Why this is correct
Encryption protects at rest; validation detects tampering.
Related concept
Static NAT maps one inside address to one outside address.
✗
AWS KMS and CloudWatch Logs
Why it's wrong here
CloudWatch Logs does not provide log file validation.
✗
S3 bucket policies and versioning
Why it's wrong here
Versioning helps but does not encrypt or validate integrity.
✗
IAM roles and S3 bucket policies
Why it's wrong here
IAM and bucket policies control access but not encryption or integrity.
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 ANS-C01 NAT questions on configuration and troubleshooting.
Network Security, Compliance and Governance — This question tests Network Security, Compliance and Governance — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: S3 server-side encryption and CloudTrail log file validation — Option A is correct because S3 server-side encryption (SSE-S3 or SSE-KMS) encrypts logs at rest, and CloudTrail log file validation provides integrity verification. Option B (KMS with CloudWatch) does not provide integrity. Option C (IAM roles) is not relevant. Option D (S3 bucket policies) does not encrypt or validate.
What should I do if I get this ANS-C01 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 ANS-C01 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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