The correct combination is enabling S3 Object Lock in compliance mode on the raw data prefix and using bucket policies to restrict access to the transformed data prefix. S3 Object Lock in compliance mode ensures data immutability by preventing any user, including the root account, from overwriting or deleting objects, which is critical for preserving raw data integrity in a data lake. Bucket policies then provide granular access control by allowing or denying actions on specific prefixes, securing the transformed datasets. On the AWS Certified Data Engineer Associate DEA-C01 exam, this question tests your ability to distinguish between features that enforce immutability versus those that only track changes, such as versioning, or those that can delete data, like lifecycle policies. A common trap is assuming versioning alone prevents deletion, but it only creates delete markers, leaving objects recoverable but not truly immutable. Memory tip: “Compliance locks the data, policies lock the door.”
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 data engineer is designing a data lake on Amazon S3. The data lake will store raw data, transformed data, and curated datasets. The engineer needs to ensure that raw data is immutable (never overwritten or deleted) and that only authorized users can access the transformed data. Which combination of S3 features should the engineer use?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "never"
Why it matters: Absolute qualifier. True only if the statement has zero exceptions — be cautious of options that seem obvious but break down in edge cases.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Enable S3 Object Lock in compliance mode on the raw data prefix and use bucket policies to restrict access to transformed data prefix.
Option B is correct. S3 Object Lock prevents objects from being deleted or overwritten; S3 bucket policies control access to specific prefixes. Option A is wrong because versioning alone does not prevent deletion; delete markers can be placed. Option C is wrong because lifecycle policies can delete objects. Option D is wrong because SSE-KMS encrypts data but does not prevent deletion.
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.
✗
Use S3 Lifecycle policies to archive raw data to S3 Glacier and set bucket policies for transformed data.
Why it's wrong here
Lifecycle policies can delete objects, not prevent deletion.
✗
Enable S3 Versioning and use S3 Access Points for each prefix.
Why it's wrong here
Versioning does not prevent deletion; delete markers still allow object deletion.
✗
Enable default encryption with SSE-KMS and use S3 bucket policies to restrict access.
Why it's wrong here
Encryption does not prevent deletion or overwrite.
✓
Enable S3 Object Lock in compliance mode on the raw data prefix and use bucket policies to restrict access to transformed data prefix.
Why this is correct
Object Lock in compliance mode prevents writes and deletes; bucket policies control access.
Clue confirmation
The clue word "never" in the question point toward this answer.
Related concept
Static NAT maps one inside address to one outside address.
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: Enable S3 Object Lock in compliance mode on the raw data prefix and use bucket policies to restrict access to transformed data prefix. — Option B is correct. S3 Object Lock prevents objects from being deleted or overwritten; S3 bucket policies control access to specific prefixes. Option A is wrong because versioning alone does not prevent deletion; delete markers can be placed. Option C is wrong because lifecycle policies can delete objects. Option D is wrong because SSE-KMS encrypts data but does not prevent deletion.
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.
Are there clue words in this question I should notice?
Yes — watch for: "never". Absolute qualifier. True only if the statement has zero exceptions — be cautious of options that seem obvious but break down in edge cases.
What is the key concept behind this question?
Static NAT maps one inside address to one outside address.
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