- A
s3:x-amz-server-side-encryption-aws-kms-key-id
This condition key allows you to specify a required KMS key ID for server-side encryption.
- B
kms:ViaService
Why wrong: This condition key limits KMS key usage to specific AWS services, not to a specific key for S3 uploads.
- C
s3:x-amz-server-side-encryption
Why wrong: This condition key only enforces that encryption is used, not a specific key.
- D
kms:EncryptionContext
Why wrong: This condition key enforces encryption context, not the KMS key ID.
Question 1,202 of 1,786
S3 Bucket Policy — Enforce KMS Encryption Key
This DEA-C01 practice question tests your understanding of data security 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 data engineer needs to restrict access to an Amazon S3 bucket so that only objects encrypted with a specific AWS KMS key can be uploaded. Which S3 bucket policy condition should be used?
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:x-amz-server-side-encryption-aws-kms-key-id
The correct condition is s3:x-amz-server-side-encryption-aws-kms-key-id (option A). This condition key allows you to require that objects uploaded to the S3 bucket are encrypted with a specific AWS KMS key by checking the key ID used in the encryption header. Option B (kms:ViaService) restricts KMS key usage to specific AWS services but does not enforce a key ID on S3 objects. Option C (s3:x-amz-server-side-encryption) only checks whether server-side encryption is enabled, not the specific key. Option D (kms:EncryptionContext) is used to enforce encryption context, not the key ID.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
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:x-amz-server-side-encryption-aws-kms-key-id
Why this is correct
This condition key allows you to specify a required KMS key ID for server-side encryption.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
kms:ViaService
Why it's wrong here
This condition key limits KMS key usage to specific AWS services, not to a specific key for S3 uploads.
- ✗
s3:x-amz-server-side-encryption
Why it's wrong here
This condition key only enforces that encryption is used, not a specific key.
- ✗
kms:EncryptionContext
Why it's wrong here
This condition key enforces encryption context, not the KMS key ID.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Detailed technical explanation
How to think about this question
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
KKey Concepts to Remember
- Read the scenario before looking for a memorised answer.
- Find the constraint that changes the correct option.
- Eliminate answers that are true in general but not in this case.
- Use explanations to understand the rule behind the answer.
TExam Day Tips
- Underline the problem statement mentally.
- Watch for words such as best, first, most likely and least administrative effort.
- Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
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.
Quick reference
AWS S3 Storage Class Comparison
| Storage Class | Min Duration | Retrieval | Use Case |
|---|---|---|---|
| S3 Standard | None | Immediate | Frequently accessed data |
| S3 Standard-IA | 30 days | Immediate | Infrequent access, rapid retrieval |
| S3 One Zone-IA | 30 days | Immediate | Non-critical infrequent data |
| S3 Intelligent-Tiering | None | Immediate–hours | Unknown or changing access patterns |
| S3 Glacier Instant | 90 days | Milliseconds | Archive with instant retrieval |
| S3 Glacier Flexible | 90 days | Minutes–hours | Archive, flexible retrieval |
| S3 Glacier Deep Archive | 180 days | Hours | Long-term compliance archive |
What to study next
Got this wrong? Here's your next step.
Identify which DEA-C01 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
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FAQ
Questions learners often ask
What does this DEA-C01 question test?
Data Security and Governance — This question tests Data Security and Governance — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: s3:x-amz-server-side-encryption-aws-kms-key-id — The correct condition is s3:x-amz-server-side-encryption-aws-kms-key-id (option A). This condition key allows you to require that objects uploaded to the S3 bucket are encrypted with a specific AWS KMS key by checking the key ID used in the encryption header. Option B (kms:ViaService) restricts KMS key usage to specific AWS services but does not enforce a key ID on S3 objects. Option C (s3:x-amz-server-side-encryption) only checks whether server-side encryption is enabled, not the specific key. Option D (kms:EncryptionContext) is used to enforce encryption context, not the key ID.
What should I do if I get this DEA-C01 question wrong?
Identify which DEA-C01 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
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. Refer to the exhibit. A data engineer reviews an Amazon S3 server access log entry for an object upload. The log shows a status of 200 and encryption status "AES256". The company policy requires that all data be encrypted with SSE-KMS. Which action should the engineer take to enforce this policy?
hard- ✓ A.Attach an S3 bucket policy that denies s3:PutObject unless the request includes x-amz-server-side-encryption: aws:kms
- B.Revoke the IAM role's s3:PutObject permission
- C.Enable AWS CloudTrail data events to monitor future uploads
- D.Enable S3 default encryption with SSE-KMS on the bucket
Why A: The correct answer is A because the log shows the object was uploaded with SSE-S3 (AES256), not the required SSE-KMS. To enforce the policy, the engineer should attach an S3 bucket policy that denies s3:PutObject unless the request includes the x-amz-server-side-encryption header set to aws:kms. Option D (default encryption) would encrypt new objects with SSE-KMS, but it does not block uploads that explicitly use SSE-S3; default encryption only applies when no encryption header is specified. Options B and C do not enforce the policy: revoking IAM permissions is too broad and CloudTrail only logs events.
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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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