DP-300 Implement a secure environment Practice Question
An Azure SQL Database contains personally identifiable information (PII). You need to mask the PII columns from non-administrative users while allowing administrators to see the actual data. Which feature should you use?
⚠ Common exam trap
Test-takers frequently confuse Dynamic Data Masking with Always Encrypted, thinking both hide data from the database engine, but DDM only masks output while Always Encrypted encrypts data at the client and prevents the server from ever seeing plaintext.
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
✓
Dynamic Data Masking
Dynamic Data Masking (DDM) is the correct choice because it selectively obscures sensitive PII columns in query results for non-administrative users, while leaving the data unmasked for users with elevated permissions (e.g., db_owner or the UNMASK permission). This is achieved by defining masking rules on specific columns, such as email or phone number, without altering the underlying stored data.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Always Encrypted
Why it's wrong here
Always Encrypted prevents even administrators from seeing plaintext without the key.
- ✗
Transparent Data Encryption (TDE)
Why it's wrong here
TDE does not provide column-level masking.
- ✓
Dynamic Data Masking
Why this is correct
DDM masks data for non-privileged users and can be bypassed for administrators.
- ✗
Row-Level Security
Why it's wrong here
RLS filters rows, not columns.
Go deeper
Related to this question
Learn chapter
Overview of Azure Data Platform Options
Key term
Azure SQL Performance Tuning
Azure SQL Performance Tuning is the process of optimizing the speed and efficiency of queries and database operations in Microsoft Azure SQL Database or SQL Managed Instance to reduce latency and improve throughput.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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