The correct combination is enabling S3 Versioning and attaching a bucket policy that denies PutObject requests without the s3:x-amz-server-side-encryption-aws:kms condition. S3 Versioning protects against accidental deletion by preserving previous versions of objects, so even if a delete marker is applied, the data remains recoverable. The bucket policy enforces SSE-KMS encryption at upload time by rejecting any object that is not encrypted with the required KMS key, ensuring compliance for all new data. On the AWS Certified Data Engineer Associate DEA-C01 exam, this scenario tests your understanding that default encryption settings only apply to future uploads and do not retroactively enforce encryption, while MFA Delete is an optional safeguard, not a requirement. A common trap is confusing bucket policies with default encryption—remember that policies actively block non-compliant uploads, whereas default encryption merely adds encryption without enforcement. Memory tip: “Versioning for deletion, policy for encryption.”
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 financial services company stores sensitive transaction data in an Amazon S3 bucket. Compliance requires that all objects be encrypted using SSE-KMS and that the bucket be protected from accidental deletion. Which combination of actions meets these requirements? (Select TWO.)
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Add a bucket policy that denies PutObject if the object is not encrypted with SSE-KMS
Options A and C are correct because enabling versioning protects against accidental deletion and a bucket policy denying unencrypted uploads enforces SSE-KMS. Option B (default encryption) does not enforce encryption on existing objects. Option D (MFA delete) is an additional protection but not required by the scenario. Option E (block public access) addresses public access, not 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.
✗
Enable MFA Delete on the bucket
Why it's wrong here
MFA Delete provides extra protection but is not required.
✗
Enable S3 Block Public Access
Why it's wrong here
This prevents public access but does not protect against deletion.
✓
Add a bucket policy that denies PutObject if the object is not encrypted with SSE-KMS
Why this is correct
This ensures all uploads use SSE-KMS.
Related concept
Static NAT maps one inside address to one outside address.
✓
Enable S3 Versioning on the bucket
Why this is correct
Versioning allows recovery of deleted objects.
Related concept
Static NAT maps one inside address to one outside address.
✗
Set default encryption to SSE-S3
Why it's wrong here
SSE-S3 does not meet the requirement for KMS 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: Add a bucket policy that denies PutObject if the object is not encrypted with SSE-KMS — Options A and C are correct because enabling versioning protects against accidental deletion and a bucket policy denying unencrypted uploads enforces SSE-KMS. Option B (default encryption) does not enforce encryption on existing objects. Option D (MFA delete) is an additional protection but not required by the scenario. Option E (block public access) addresses public access, not 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.
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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