The correct configuration is to enable Transparent Data Encryption (TDE) and use a customer-managed key stored in Azure Key Vault as the TDE protector. This satisfies the regulation because TDE performs real-time encryption and decryption of your Azure SQL Database’s data and log files at rest, while the customer-managed key—rather than a Microsoft-managed key—gives you full control over key rotation, revocation, and access auditing, which is the core requirement for compliance. On the DP-300 exam, this scenario tests your understanding of the TDE protector hierarchy and the distinction between service-managed and customer-managed keys; a common trap is confusing TDE with Always Encrypted, but remember that TDE handles at-rest encryption of the entire database, whereas Always Encrypted protects specific columns in transit and at rest. A helpful memory tip: “TDE locks the whole house, but the customer key is your own padlock on the front door.”
DP-300 Implement a secure environment Practice Question
This DP-300 practice question tests your understanding of implement a secure environment. 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.
Your organization needs to comply with a regulation that requires data to be encrypted at rest using a customer-managed key stored in Azure Key Vault. You have an Azure SQL Database. What should you configure?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Enable Transparent Data Encryption (TDE) and use a customer-managed key in Azure Key Vault as the TDE protector.
Transparent Data Encryption (TDE) with a customer-managed key in Azure Key Vault meets the requirement for data at rest encryption using a customer-controlled key. TDE encrypts the database files (data and log files) at rest, and by using a customer-managed key as the TDE protector, you retain control over key rotation and revocation, satisfying regulatory compliance.
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 Azure Policy to enforce encryption at rest.
Why it's wrong here
Azure Policy can audit compliance but does not implement encryption.
✗
Enable Always Encrypted and store the column master key in Azure Key Vault.
Why it's wrong here
Always Encrypted is for column-level encryption, not the entire database at rest.
✗
Configure Azure Storage Service Encryption for the database files.
Why it's wrong here
Azure SQL Database manages its own storage; Storage Service Encryption is not directly configurable.
✓
Enable Transparent Data Encryption (TDE) and use a customer-managed key in Azure Key Vault as the TDE protector.
Why this is correct
TDE with customer-managed key in Key Vault provides encryption at rest with customer control.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is confusing Always Encrypted (which encrypts specific columns at the application level) with TDE (which encrypts the entire database at rest), leading candidates to choose Option B when the requirement is for full database encryption at rest with a customer-managed key.
Detailed technical explanation
How to think about this question
TDE in Azure SQL Database uses a database encryption key (DEK) that is protected by a TDE protector stored in Azure Key Vault. When using a customer-managed key, the DEK is encrypted by the key in Key Vault, and the SQL Database service must have permissions to access that key via a managed identity or service principal. This setup allows the customer to control key lifecycle (rotation, revocation) and audit key usage, which is critical for compliance with regulations like GDPR or HIPAA.
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.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this DP-300 question in full detail.
Implement a secure environment — This question tests Implement a secure environment — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Enable Transparent Data Encryption (TDE) and use a customer-managed key in Azure Key Vault as the TDE protector. — Transparent Data Encryption (TDE) with a customer-managed key in Azure Key Vault meets the requirement for data at rest encryption using a customer-controlled key. TDE encrypts the database files (data and log files) at rest, and by using a customer-managed key as the TDE protector, you retain control over key rotation and revocation, satisfying regulatory compliance.
What should I do if I get this DP-300 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
About these practice questions
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These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. Which THREE of the following are required to configure Transparent Data Encryption (TDE) with customer-managed keys in Azure Key Vault for Azure SQL Database?
hard
✓ A.The key encryption key must be stored in Azure Key Vault.
B.The Azure Key Vault must be in the same region as the database.
✓ C.The Azure Key Vault must have soft-delete and purge protection enabled.
✓ D.The Azure SQL Database server must have an Azure AD identity.
E.The SQL server must have an RBAC role assignment on the key vault.
Why A: Option A is correct because Transparent Data Encryption (TDE) with customer-managed keys requires the key encryption key (KEK) to be stored in Azure Key Vault. This KEK is used to protect the database encryption key (DEK), which is stored in the database boot record. Without the KEK in Key Vault, the customer-managed key scenario cannot be implemented, as Azure SQL Database must be able to access the key to perform encryption operations.
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Question Discussion
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