The answer is SSE-KMS, or Server-Side Encryption with AWS KMS-Managed Keys, because it is the only S3 encryption option that allows you to use a customer-managed key stored in AWS KMS while still having S3 handle the encryption process. This satisfies the security policy requirement for customer-generated and managed keys, as SSE-KMS lets you create, rotate, and control access to your own KMS key, whereas SSE-S3 uses AWS-managed keys and SSE-C requires you to provide your own key but does not store it in KMS. On the AWS Certified Data Engineer Associate DEA-C01 exam, this question tests your ability to distinguish between S3 encryption options based on key ownership and storage, with a common trap being confusion between SSE-C and SSE-KMS—remember that SSE-C keys are never stored by AWS. A useful memory tip is to think of the "K" in KMS as standing for "Key Management by you," while the "C" in SSE-C stands for "Customer-provided, not stored."
DEA-C01 Data Security and Governance Practice Question
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 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?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Server-Side Encryption with AWS KMS-Managed Keys (SSE-KMS)
Option C is correct because SSE-KMS allows customer-managed keys in KMS. Option A is wrong because SSE-S3 uses AWS-managed keys. Option B is wrong because SSE-C uses customer-provided keys, not stored in KMS. Option D is wrong because client-side encryption is not managed by S3.
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.
✗
Server-Side Encryption with S3-Managed Keys (SSE-S3)
Why it's wrong here
SSE-S3 uses AWS-managed keys, not customer-managed.
✗
Client-Side Encryption
Why it's wrong here
Client-side encryption is performed before upload, not by S3.
✗
Server-Side Encryption with Customer-Provided Keys (SSE-C)
Why it's wrong here
SSE-C uses keys provided by the customer but not stored in KMS.
✓
Server-Side Encryption with AWS KMS-Managed Keys (SSE-KMS)
Why this is correct
SSE-KMS allows using customer-managed keys in KMS.
Related concept
Read the scenario before looking for a memorised answer.
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.
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.
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: Server-Side Encryption with AWS KMS-Managed Keys (SSE-KMS) — Option C is correct because SSE-KMS allows customer-managed keys in KMS. Option A is wrong because SSE-S3 uses AWS-managed keys. Option B is wrong because SSE-C uses customer-provided keys, not stored in KMS. Option D is wrong because client-side encryption is not managed by S3.
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 →
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 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?
medium
✓ A.SSE-KMS
B.Client-side encryption
C.SSE-S3
D.SSE-C
Why A: Option B is correct because SSE-KMS uses a customer-managed KMS key, allowing the team to control access and permissions for decryption. Option A (SSE-S3) uses Amazon S3-managed keys, which does not provide customer-controlled access. Option C (SSE-C) requires the customer to manage the encryption keys themselves, not using KMS. Option D (client-side encryption) encrypts data before sending to S3, which is not an S3 server-side encryption option.
Variation 2. A data engineer needs to ensure that an S3 bucket containing sensitive customer data is encrypted at rest. The company requires that all encryption keys be managed by AWS and rotated annually. Which encryption option meets these requirements?
medium
A.Use server-side encryption with AWS KMS (SSE-KMS)
B.Use client-side encryption with AWS KMS
C.Use server-side encryption with customer-provided keys (SSE-C)
✓ D.Use server-side encryption with S3-managed keys (SSE-S3)
Why D: SSE-S3 uses AWS-managed keys and handles key rotation automatically. SSE-KMS also uses AWS-managed keys but gives more control; however, the requirement does not specify customer-managed keys. SSE-C requires the customer to manage keys, which does not meet the requirement of AWS-managed keys. Option D is not a valid encryption type.
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
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.
Question Discussion
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
Sign in to join the discussion.