- A
AWS KMS for encryption at rest, Kinesis Data Analytics for in-transit encryption, and AWS CloudTrail for auditing.
Why wrong: Kinesis Data Analytics does not provide encryption; it processes data.
- B
AWS KMS for encryption at rest, Amazon CloudWatch Logs for auditing, and TLS for in-transit encryption.
Why wrong: CloudWatch Logs does not audit S3 data access; CloudTrail is needed.
- C
S3 server-side encryption (SSE-S3) for at-rest encryption, HTTPS for in-transit encryption, and AWS CloudTrail for auditing.
SSE-S3 encrypts objects at rest, HTTPS encrypts data in transit, and CloudTrail logs S3 API operations for auditing.
- D
S3 client-side encryption, AWS Config for auditing, and TLS for in-transit encryption.
Why wrong: AWS Config does not audit data access; it records configuration changes.
Quick Answer
The correct answer is S3 server-side encryption (SSE-S3) for at-rest encryption, HTTPS for in-transit encryption, and AWS CloudTrail for auditing. This combination works because SSE-S3 encrypts data at the object level as it is written to Amazon S3, HTTPS secures the data during ingestion from Kinesis Data Firehose, and CloudTrail records all S3 API calls—such as GetObject and PutObject—to provide a detailed audit trail of who accessed the data and when. On the AWS Certified Data Engineer Associate DEA-C01 exam, this question tests your ability to distinguish between services that handle data protection versus configuration or monitoring: a common trap is confusing CloudWatch Logs (which monitors performance metrics) or AWS Config (which tracks resource compliance) with CloudTrail’s specific role in auditing data access. For a quick memory tip, think “SSE + HTTPS + Trails” to recall the three pillars of encryption and auditing for sensitive data in S3.
DEA-C01 Data Operations and Support Practice Question
This DEA-C01 practice question tests your understanding of data operations and support. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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 data engineer is designing a data pipeline that processes sensitive personal data. The data is ingested via Amazon Kinesis Data Firehose and stored in Amazon S3. The pipeline must ensure that the data is encrypted at rest and in transit. The engineer also needs to audit access to the data. Which combination of services meets these requirements?
Answer choices
Why each option matters
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 (SSE-S3) for at-rest encryption, HTTPS for in-transit encryption, and AWS CloudTrail for auditing.
Option B is correct because SSE-S3 provides encryption at rest, HTTPS ensures encryption in transit, and CloudTrail logs S3 API calls for auditing. Option A is incorrect because CloudWatch Logs is for monitoring, not auditing data access. Option C is incorrect because AWS Config tracks configuration, not data access. Option D is incorrect because Kinesis Data Analytics is for processing, not encryption.
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.
- ✗
AWS KMS for encryption at rest, Kinesis Data Analytics for in-transit encryption, and AWS CloudTrail for auditing.
Why it's wrong here
Kinesis Data Analytics does not provide encryption; it processes data.
- ✗
AWS KMS for encryption at rest, Amazon CloudWatch Logs for auditing, and TLS for in-transit encryption.
Why it's wrong here
CloudWatch Logs does not audit S3 data access; CloudTrail is needed.
- ✓
S3 server-side encryption (SSE-S3) for at-rest encryption, HTTPS for in-transit encryption, and AWS CloudTrail for auditing.
- ✗
S3 client-side encryption, AWS Config for auditing, and TLS for in-transit encryption.
Why it's wrong here
AWS Config does not audit data access; it records configuration changes.
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.
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Data Operations and Support — study guide chapter
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FAQ
Questions learners often ask
What does this DEA-C01 question test?
Data Operations and Support — This question tests Data Operations and Support — 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 (SSE-S3) for at-rest encryption, HTTPS for in-transit encryption, and AWS CloudTrail for auditing. — Option B is correct because SSE-S3 provides encryption at rest, HTTPS ensures encryption in transit, and CloudTrail logs S3 API calls for auditing. Option A is incorrect because CloudWatch Logs is for monitoring, not auditing data access. Option C is incorrect because AWS Config tracks configuration, not data access. Option D is incorrect because Kinesis Data Analytics is for processing, not encryption.
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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Same concept, more angles
1 more ways this is tested on DEA-C01
These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. A data engineer needs to ensure that sensitive data stored in Amazon S3 is encrypted at rest. Which TWO options meet this requirement? (Choose TWO.)
medium- ✓ A.Server-Side Encryption with AWS KMS-Managed Keys (SSE-KMS)
- ✓ B.Server-Side Encryption with S3-Managed Keys (SSE-S3)
- C.Using a VPC to restrict network access
- D.Enabling MFA Delete on the S3 bucket
- E.Client-Side Encryption with SSL/TLS
Why A: Server-Side Encryption with AWS KMS-Managed Keys (SSE-KMS) allows you to enforce encryption at rest for S3 objects using a customer-managed or AWS-managed KMS key. This option meets the requirement because the encryption is applied server-side by S3 before the data is written to disk, and the data is decrypted automatically when accessed with appropriate permissions. SSE-KMS also provides an audit trail via AWS CloudTrail for every key usage.
Last reviewed: Jun 20, 2026
This DEA-C01 practice question is part of Courseiva's free Amazon Web Services certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the DEA-C01 exam.
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