DP-300 Implement a secure environment Practice Question
You are designing a security strategy for Azure SQL Managed Instance. The compliance team requires that all database backups be encrypted at rest using a customer-managed key. Which feature should you enable?
⚠ Common exam trap
It's easy for candidates to confuse Always Encrypted (which encrypts column data but not backups) with TDE (which encrypts the entire database and backups), leading them to select Always Encrypted when the requirement explicitly mentions backup encryption.
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
✓
Transparent Data Encryption (TDE) with a customer-managed key stored in Azure Key Vault.
Transparent Data Encryption (TDE) with a customer-managed key stored in Azure Key Vault is the correct feature because it encrypts the database at rest, including all backup files, using a key that the customer controls. This satisfies the compliance requirement for customer-managed key encryption of backups, as TDE automatically encrypts backups when the database is encrypted.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Transparent Data Encryption (TDE) with a customer-managed key stored in Azure Key Vault.
Why this is correct
TDE encrypts the underlying database files and backups at rest.
- ✗
Always Encrypted with a column master key in Azure Key Vault.
Why it's wrong here
Always Encrypted protects sensitive columns, not entire backups.
- ✗
Transparent Data Encryption (TDE) with a service-managed key.
Why it's wrong here
Service-managed key does not satisfy customer-managed key requirement.
- ✗
Row-Level Security (RLS) with a custom authorization function.
Why it's wrong here
RLS is for access control, not encryption.
Go deeper
Related to this question
Learn chapter
Overview of Azure Data Platform Options
Key term
Azure SQL Managed Instance
Azure SQL Managed Instance is a fully managed cloud database service that gives you nearly all the features of Microsoft SQL Server on your own server, without you having to manage the hardware or operating system.
Key term
Transparent Data Encryption
Transparent Data Encryption is a security feature that automatically encrypts data written to a database and decrypts it when read, without requiring any changes to the application.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This DP-300 practice question is part of Courseiva's free Microsoft 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 DP-300 exam.