The correct combination is S3 bucket policies with IAM policies and AWS CloudTrail with data events. This works because S3 bucket policies and IAM policies together form a robust access control layer, allowing you to explicitly grant or deny permissions to specific principals and resources, while CloudTrail data events capture detailed object-level API calls like GetObject and PutObject, providing the necessary audit trail for PII access. On the AWS Certified Data Engineer Associate DEA-C01 exam, this question tests your ability to distinguish between services that handle access control versus those focused on encryption, network isolation, or data classification—common traps include confusing AWS KMS for logging or assuming VPC endpoints provide auditing. A useful memory tip is to think of the "two C's": Control with IAM and bucket policies, then Capture with CloudTrail data events.
DEA-C01 Data Store Management Practice Question
This DEA-C01 practice question tests your understanding of data store management. 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 designing a data lake on Amazon S3. The data includes personal identifiable information (PII). The data engineer must ensure that only authorized users can access the data, and that access is logged for auditing. Which combination of services should the data engineer use?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
S3 bucket policies with IAM policies and AWS CloudTrail with data events
Option C is correct because S3 bucket policies and IAM policies control access, and CloudTrail logs data events for auditing. Option A is wrong because KMS is for encryption, not access control or logging. Option B is wrong because VPC endpoints are for network isolation, not logging. Option D is wrong because Macie is for data discovery and classification, not access control.
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 bucket policies with IAM policies and AWS CloudTrail with data events
Why this is correct
Bucket and IAM policies control access; CloudTrail logs data events for auditing.
Related concept
Static NAT maps one inside address to one outside address.
✗
Amazon S3 access points and VPC endpoints
Why it's wrong here
Access points help with access, but VPC endpoints don't provide logging.
✗
Amazon Macie to discover PII and S3 Object Lock to prevent deletion
Why it's wrong here
Macie discovers but doesn't control access; Object Lock prevents deletion, not unauthorized access.
✗
AWS KMS to encrypt data and AWS CloudTrail to log access
Why it's wrong here
KMS does not enforce access control; it's for encryption.
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 DEA-C01 NAT questions on configuration and troubleshooting.
Data Store Management — This question tests Data Store Management — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: S3 bucket policies with IAM policies and AWS CloudTrail with data events — Option C is correct because S3 bucket policies and IAM policies control access, and CloudTrail logs data events for auditing. Option A is wrong because KMS is for encryption, not access control or logging. Option B is wrong because VPC endpoints are for network isolation, not logging. Option D is wrong because Macie is for data discovery and classification, not access control.
What should I do if I get this DEA-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 DEA-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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