- A
S3 Versioning
Why wrong: Protects against overwrites, not encryption.
- B
S3 bucket policies
Why wrong: Access control, not encryption.
- C
MFA Delete
Why wrong: Adds authentication, not encryption.
- D
Server-side encryption with S3-managed keys (SSE-S3)
Encrypts data at rest.
- E
Server-side encryption with AWS KMS (SSE-KMS)
Encrypts data at rest.
Question 1,174 of 1,748
SCS-C02 Data Protection Practice Question
This SCS-C02 practice question tests your understanding of data protection. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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 company is designing a data protection strategy for Amazon S3. Which TWO of the following are valid methods to protect data at rest in S3?
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
✓
Server-side encryption with S3-managed keys (SSE-S3)
Server-side encryption with S3-managed keys (SSE-S3) encrypts data at rest using AES-256, with Amazon S3 managing the encryption/decryption process and key rotation automatically. This is a valid method to protect data at rest in S3 because it ensures objects are encrypted before being written to disk and decrypted when accessed, without requiring any additional client-side logic or key management overhead.
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 Versioning
Why it's wrong here
Protects against overwrites, not encryption.
- ✗
S3 bucket policies
Why it's wrong here
Access control, not encryption.
- ✗
MFA Delete
Why it's wrong here
Adds authentication, not encryption.
- ✓
Server-side encryption with S3-managed keys (SSE-S3)
Why this is correct
Encrypts data at rest.
Related concept
Read the scenario before looking for a memorised answer.
- ✓
Server-side encryption with AWS KMS (SSE-KMS)
Why this is correct
Encrypts data at rest.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse data protection features like versioning or access controls (bucket policies, MFA Delete) with encryption mechanisms, assuming they provide data-at-rest protection when they do not.
Detailed technical explanation
How to think about this question
SSE-S3 uses a unique envelope encryption model where each object is encrypted with a unique data key, which is then encrypted with a regularly rotated master key managed by AWS. This approach ensures that even if an attacker gains access to the underlying storage hardware, the encrypted data remains unreadable without the keys. In contrast, SSE-KMS provides additional control over key rotation, audit trails via AWS CloudTrail, and the ability to enforce key usage policies, making it suitable for compliance requirements like PCI-DSS or HIPAA.
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.
Quick reference
Symmetric Encryption Algorithm Comparison
| Algorithm | Key Size | Block Size | Status | Notes |
|---|---|---|---|---|
| AES-128 | 128-bit | 128-bit | Current standard | NIST approved; WPA3, TLS |
| AES-256 | 256-bit | 128-bit | Current standard | Preferred for sensitive / govt data |
| 3DES | 112-bit effective | 64-bit | Deprecated (2023) | Replaced by AES |
| DES | 56-bit | 64-bit | Broken | Cracked in < 24 h; never deploy |
| ChaCha20 | 256-bit | Stream cipher | Current | TLS 1.3, WireGuard |
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.
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Data Protection — study guide chapter
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FAQ
Questions learners often ask
What does this SCS-C02 question test?
Data Protection — This question tests Data Protection — 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 S3-managed keys (SSE-S3) — Server-side encryption with S3-managed keys (SSE-S3) encrypts data at rest using AES-256, with Amazon S3 managing the encryption/decryption process and key rotation automatically. This is a valid method to protect data at rest in S3 because it ensures objects are encrypted before being written to disk and decrypted when accessed, without requiring any additional client-side logic or key management overhead.
What should I do if I get this SCS-C02 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.
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Last reviewed: Jun 24, 2026
This SCS-C02 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 SCS-C02 exam.
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