- A
Use SSE-KMS with a customer-managed key and automatic rotation
Why wrong: While KMS supports automatic rotation, SSE-S3 has less overhead.
- B
Use SSE-C (customer-provided keys)
Why wrong: SSE-C requires the customer to manage keys, not automatic rotation.
- C
Use SSE-S3 (Amazon S3-managed keys)
SSE-S3 automatically rotates keys and requires no customer management.
- D
Use SSE-KMS with a customer-managed key and manual rotation
Why wrong: Manual rotation adds operational overhead.
Question 285 of 1,755
MLS-C01 Data Engineering Practice Question
This MLS-C01 practice question tests your understanding of data engineering. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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 stores sensitive customer data in an S3 bucket. The security team requires that all data be encrypted at rest with a key that is automatically rotated every year. Which solution meets these requirements with the least operational overhead?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue:
"least"Why it matters: You want the option with minimum overhead, fewest steps, or lowest impact — not the most feature-rich or comprehensive answer.
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
✓
Use SSE-S3 (Amazon S3-managed keys)
SSE-S3 uses Amazon S3-managed keys (AES-256) that are automatically rotated annually by AWS, meeting the encryption-at-rest and automatic rotation requirements with zero operational overhead. This is the simplest option because no key management or rotation configuration is needed from the customer.
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.
- ✗
Use SSE-KMS with a customer-managed key and automatic rotation
Why it's wrong here
While KMS supports automatic rotation, SSE-S3 has less overhead.
- ✗
Use SSE-C (customer-provided keys)
Why it's wrong here
SSE-C requires the customer to manage keys, not automatic rotation.
- ✓
Use SSE-S3 (Amazon S3-managed keys)
Why this is correct
SSE-S3 automatically rotates keys and requires no customer management.
Clue confirmation
The clue word "least" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Use SSE-KMS with a customer-managed key and manual rotation
Why it's wrong here
Manual rotation adds operational overhead.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often overthink and choose SSE-KMS with customer-managed keys because they associate 'customer-managed' with more control, but the question explicitly asks for the least operational overhead, which SSE-S3 provides by eliminating all key management tasks.
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, and that data key is encrypted with a regularly rotated master key managed by S3. The rotation happens automatically every year without any customer action, and the encryption is transparent to the application using standard S3 PUT/GET operations. This contrasts with SSE-KMS, where you must manage KMS key policies, grants, and potentially enable automatic key rotation (which rotates the KMS key material but not the data key).
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.
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FAQ
Questions learners often ask
What does this MLS-C01 question test?
Data Engineering — This question tests Data Engineering — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Use SSE-S3 (Amazon S3-managed keys) — SSE-S3 uses Amazon S3-managed keys (AES-256) that are automatically rotated annually by AWS, meeting the encryption-at-rest and automatic rotation requirements with zero operational overhead. This is the simplest option because no key management or rotation configuration is needed from the customer.
What should I do if I get this MLS-C01 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Are there clue words in this question I should notice?
Yes — watch for: "least". You want the option with minimum overhead, fewest steps, or lowest impact — not the most feature-rich or comprehensive answer.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jul 4, 2026
This MLS-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 MLS-C01 exam.
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