DEA-C01 Data Store Management Practice Question
Which TWO actions are recommended for securing data at rest in Amazon S3? (Choose two.)
⚠ Common exam trap
A common mix-up: candidates confuse data protection features like Versioning or replication with encryption controls, but the question specifically asks for securing data at rest, which requires encryption mechanisms such as default encryption or policy-enforced encryption headers.
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
✓
Enable default encryption on the S3 bucket using SSE-S3 or SSE-KMS.
Enabling default encryption on an S3 bucket using SSE-S3 or SSE-KMS ensures that all objects stored in the bucket are encrypted at rest automatically, even if the upload request does not include encryption headers. This satisfies the requirement for securing data at rest by applying server-side encryption to every object written to the bucket.
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 or SSE-KMS.
Why this is correct
Ensures all new objects are encrypted automatically.
- ✗
Use S3 Bucket Key to reduce KMS request costs.
Why it's wrong here
Cost optimization, not a security requirement.
- ✗
Enable S3 Versioning to protect against accidental deletions.
Why it's wrong here
Versioning is for data protection, not encryption.
- ✓
Apply a bucket policy that denies PutObject requests without the x-amz-server-side-encryption header.
Why this is correct
Enforces encryption for all uploads.
- ✗
Configure cross-region replication to replicate data to another bucket.
Why it's wrong here
Replication is for durability, not encryption enforcement.
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 |
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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.