VA-003 Transit Secrets Engine Practice Question
A company wants to use Vault's Key Management Secrets Engine (KMSE) to encrypt data stored in AWS S3. The security team requires that the encryption key used by Vault is never exposed to the application. Which Vault architecture component ensures that the encryption key remains within the Vault boundary and is not accessible to the application?
⚠ Common exam trap
Candidates often assume KMSE is the correct answer because it proxies encryption, but the key resides externally. Transit keeps the key inside Vault, fulfilling the 'within Vault boundary' requirement.
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
✓
Vault's Transit Secrets Engine
Transit Secrets Engine performs encryption/decryption using keys stored entirely within Vault. The application sends data to Vault, which processes it with the key and returns the result, ensuring the key is never exposed. KMSE (B) delegates key storage to an external KMS, placing the key outside Vault's boundary, which contradicts the requirement that the key remains within Vault.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Vault's Cubbyhole Response Wrapping
Why it's wrong here
Cubbyhole Response Wrapping is for secure data wrapping/unwrapping, not for encryption key management.
- ✗
Vault's Key Management Secrets Engine (KMSE)
Why it's wrong here
KMSE stores the key in an external KMS (e.g., AWS KMS), outside Vault's boundary; the application still never sees the key, but the key is not kept 'within' Vault.
- ✓
Vault's Transit Secrets Engine
Why this is correct
Correct. Transit Secrets Engine maintains the encryption key inside Vault and performs crypto operations without exposing the key to the application.
- ✗
Vault's PKI Secrets Engine
Why it's wrong here
PKI Secrets Engine manages certificates, not encryption keys.
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 |
Go deeper
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This VA-003 practice question is part of Courseiva's free HashiCorp 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 VA-003 exam.