Detailed Explanation
To encrypt an Azure Data Factory (ADF) resource using a customer-managed key from Azure Key Vault, the first and mandatory step is to ensure the data factory is completely empty before enabling customer-managed key encryption.
Why Option C is Correct:
- Microsoft Documentation Requirement: According to official Azure Data Factory documentation, a customer-managed key can only be configured on an empty data factory. The factory must not contain any resources such as linked services, pipelines, data flows, or datasets.
- Encryption Process Constraint: The encryption configuration process requires a clean factory state to properly apply the customer-managed key encryption to all future resources and data.
- First Step Logic: Since Df1 currently contains a linked service, removing it is the prerequisite action that must be completed before any other configuration steps can proceed.
Analysis of Other Options:
Option A (Add a private endpoint connection to vault1):
- While private endpoints enhance security for Key Vault access, this is not the first step. The factory must be empty before encryption configuration can begin.
Option B (Enable Azure role-based access control on vault1):
- RBAC configuration is important for access control but can be configured at any time. The factory emptiness requirement takes precedence.
Option D (Create a self-hosted integration runtime):
- Self-hosted integration runtime is unrelated to the encryption process and serves different purposes for hybrid data movement scenarios.
Recommended Sequence:
- Remove all resources from Df1 (linked services, pipelines, etc.)
- Configure customer-managed key encryption using key1 from vault1
- Recreate necessary resources after encryption is enabled
- Implement additional security measures like private endpoints or RBAC as needed
This approach ensures compliance with Azure Data Factory's encryption requirements and follows Microsoft's recommended implementation sequence.
