Question 373 of 919
DP-300 Implement a secure environment Practice Question
You are deploying an Azure SQL Database that will store sensitive customer data. Compliance requirements dictate that the data must be encrypted at rest using a customer-managed key that is rotated every 90 days. You configure TDE with Azure Key Vault. What additional step is critical to ensure data remains accessible after key rotation?
⚠ Common exam trap
Watch out — candidates often assume key rotation automatically re-encrypts the database or that disabling the old key is safe, but Azure SQL Database requires the previous key version to remain enabled until the DEK is explicitly re-encrypted with the new key.
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
✓
Ensure the previous key version remains enabled in Azure Key Vault.
When using TDE with Azure Key Vault and customer-managed keys, the database is encrypted using a Data Encryption Key (DEK) that is protected by the key in Key Vault. Key rotation creates a new key version, but the DEK remains encrypted with the previous key version. To decrypt the DEK and access the data after rotation, the previous key version must remain enabled in Key Vault. If it is disabled or deleted, the database becomes inaccessible.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Store the key in a different region for disaster recovery.
Why it's wrong here
Key location does not affect rotation.
- ✓
Ensure the previous key version remains enabled in Azure Key Vault.
Why this is correct
TDE uses the key version that was active when the data was written; disabling it causes decryption failures.
- ✗
Use a premium tier of Azure Key Vault.
Why it's wrong here
Standard tier supports TDE with AKV.
- ✗
Re-encrypt the database with the new key immediately after rotation.
Why it's wrong here
TDE automatically handles key rotation; manual re-encryption is not required.
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Last reviewed: Jun 11, 2026
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