- A
SSE-KMS
SSE-KMS uses a customer-managed KMS key, allowing fine-grained access control.
- B
Client-side encryption
Why wrong: Client-side encryption is not an S3 server-side encryption option.
- C
SSE-S3
Why wrong: SSE-S3 uses Amazon S3-managed keys, not customer-managed KMS keys.
- D
SSE-C
Why wrong: SSE-C requires the customer to provide their own encryption keys, not using KMS.
Question 1,476 of 1,786
SSE-KMS vs SSE-S3 vs SSE-C: Which S3 Encryption Option to Use?
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 is configuring an S3 bucket for storing sensitive customer data. The bucket must be encrypted at rest using an AWS Key Management Service (KMS) key that is managed by the data engineering team. The team wants to ensure that only users with explicit permission can decrypt the data. Which S3 encryption option 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
✓
SSE-KMS
SSE-KMS is the correct option because it uses a customer-managed AWS KMS key, allowing the data engineering team to control access and permissions for decryption. Client-side encryption is not an S3 server-side encryption option and does not use KMS. SSE-S3 uses Amazon S3-managed keys, which do not provide customer-controlled access. SSE-C requires the customer to manage their own encryption keys and does not use KMS, nor does it allow the same level of access control as a CMK.
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.
- ✓
SSE-KMS
Why this is correct
SSE-KMS uses a customer-managed KMS key, allowing fine-grained access control.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Client-side encryption
Why it's wrong here
Client-side encryption is not an S3 server-side encryption option.
- ✗
SSE-S3
Why it's wrong here
SSE-S3 uses Amazon S3-managed keys, not customer-managed KMS keys.
- ✗
SSE-C
Why it's wrong here
SSE-C requires the customer to provide their own encryption keys, not using KMS.
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: SSE-KMS — SSE-KMS is the correct option because it uses a customer-managed AWS KMS key, allowing the data engineering team to control access and permissions for decryption. Client-side encryption is not an S3 server-side encryption option and does not use KMS. SSE-S3 uses Amazon S3-managed keys, which do not provide customer-controlled access. SSE-C requires the customer to manage their own encryption keys and does not use KMS, nor does it allow the same level of access control as a CMK.
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. A data engineer is configuring an S3 bucket to host sensitive data. The security policy requires that all objects be encrypted with a key that is generated and managed by the customer, and that the key be stored in AWS KMS. Which encryption option should be used?
medium- A.Server-Side Encryption with S3-Managed Keys (SSE-S3)
- B.Client-Side Encryption
- C.Server-Side Encryption with Customer-Provided Keys (SSE-C)
- ✓ D.Server-Side Encryption with AWS KMS-Managed Keys (SSE-KMS)
Why D: Option D is correct because SSE-KMS allows you to use customer-managed keys stored in AWS KMS, meeting the requirement for customer-generated and managed keys. Option A is incorrect because SSE-S3 uses AWS-managed keys, not customer-managed. Option B is incorrect because client-side encryption encrypts data outside S3, not using S3 server-side encryption. Option C is incorrect because SSE-C uses customer-provided keys that you manage yourself, but they are not stored in AWS KMS—you must provide them with each request.
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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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