ANS-C01 Network Security, Compliance and Governance Practice Question
Which TWO statements about AWS Key Management Service (KMS) are correct? (Choose two.)
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
✓
Customer master keys (CMKs) can be automatically rotated every year.
Options A and D are correct. AWS KMS allows automatic yearly rotation of customer master keys (CMKs) (A). KMS is a regional service, meaning CMKs are tied to a specific AWS Region (D). Option B is incorrect because KMS supports both symmetric and asymmetric encryption. Option C is incorrect because KMS does not store encrypted data; it manages encryption keys. Option E is incorrect because you can import your own key material into KMS using the 'import key material' feature.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Customer master keys (CMKs) can be automatically rotated every year.
Why this is correct
AWS KMS can automatically rotate CMKs annually.
- ✗
KMS uses symmetric encryption only.
Why it's wrong here
KMS supports both symmetric and asymmetric keys.
- ✗
KMS can store encrypted data.
Why it's wrong here
KMS does not store data; it manages encryption keys.
- ✓
KMS is a regional service.
Why this is correct
KMS is region-specific, keys do not leave the region.
- ✗
You cannot import your own key material into KMS.
Why it's wrong here
You can import your own key material.
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 |
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This ANS-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 ANS-C01 exam.