The answer is to enable default encryption on the S3 bucket using SSE-S3. This is correct because SSE-S3 provides server-side encryption with Amazon S3-managed keys, where AWS handles all key management, automatic rotation, and encryption/decryption transparently, requiring no client-side changes or additional code. For the AWS Certified Data Engineer Associate DEA-C01 exam, this scenario tests your ability to balance security requirements with operational overhead—a common trap is choosing SSE-KMS or client-side encryption, which add complexity and cost for key management. Remember that when the question emphasizes “minimal operational overhead,” SSE-S3 is almost always the intended choice because it is fully managed and requires zero configuration beyond enabling default encryption. A useful memory tip: “SSE-S3 for simplicity, SSE-KMS for control.”
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 includes sensitive customer information that must be encrypted at rest. Which combination of actions meets this requirement with minimal operational overhead?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Enable default encryption on the S3 bucket using SSE-S3
SSE-S3 provides server-side encryption with Amazon S3-managed keys, which encrypts data at rest with minimal operational overhead because AWS handles key management, rotation, and encryption/decryption transparently. Enabling default encryption on the S3 bucket ensures that all objects written to the bucket are automatically encrypted without requiring any client-side changes or additional code, meeting the requirement with the least administrative effort.
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.
✓
Enable default encryption on the S3 bucket using SSE-S3
Why this is correct
Default encryption ensures all new objects are encrypted automatically.
Related concept
Read the scenario before looking for a memorised answer.
✗
Encrypt objects client-side before uploading
Why it's wrong here
Client-side encryption adds overhead and complexity.
✗
Use an S3 bucket policy to deny writes without encryption
Why it's wrong here
This enforces encryption but doesn't automatically encrypt objects.
✗
Use an S3 Lifecycle policy to transition to Glacier
Why it's wrong here
Lifecycle policies do not encrypt data.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse 'enforcing encryption via bucket policy' (Option C) with 'automatically encrypting data' — the policy only denies unencrypted writes but does not reduce operational overhead because the client must still implement encryption logic.
Detailed technical explanation
How to think about this question
SSE-S3 uses AES-256 encryption with keys managed by AWS, and when default encryption is enabled on a bucket, S3 automatically applies encryption to any object uploaded without an explicit encryption header, including via multipart uploads. This is distinct from SSE-KMS or SSE-C, which require additional key management or client-side key provision, respectively. In a real-world scenario, if a data pipeline writes raw customer data to S3 without explicit encryption settings, default SSE-S3 ensures compliance without modifying pipeline code.
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.
TExam Day Tips
→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 exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Data Store Management — This question tests Data Store Management — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Enable default encryption on the S3 bucket using SSE-S3 — SSE-S3 provides server-side encryption with Amazon S3-managed keys, which encrypts data at rest with minimal operational overhead because AWS handles key management, rotation, and encryption/decryption transparently. Enabling default encryption on the S3 bucket ensures that all objects written to the bucket are automatically encrypted without requiring any client-side changes or additional code, meeting the requirement with the least administrative effort.
What should I do if I get this DEA-C01 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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 designing a data lake on Amazon S3. The data includes personally identifiable information (PII) that must be encrypted at rest. Which combination of actions meets the encryption requirement with the least operational overhead?
medium
A.Apply a bucket policy that denies access to unencrypted requests
✓ B.Enable default encryption on the S3 bucket using SSE-S3
C.Use client-side encryption with AWS KMS
D.Use server-side encryption with AWS KMS (SSE-KMS)
Why B: Option B is correct because S3 managed keys (SSE-S3) provide encryption at rest with minimal management. Option A is wrong because client-side encryption requires application changes. Option C is wrong because KMS adds key management overhead. Option D is wrong because bucket policies do not encrypt data.
Last reviewed: Jun 24, 2026
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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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