Question 249 of 919
DP-300 Implement a secure environment Practice Question
You are deploying Azure SQL Database for a multi-tenant application. Each tenant's data must be isolated. You need to ensure that tenants cannot access each other's data even if there is a SQL injection vulnerability. Which security feature should you implement?
⚠ Common exam trap
A common mix-up: candidates confuse data-at-rest encryption (TDE or Always Encrypted) with access control, mistakenly believing encryption alone can prevent unauthorized row access during a SQL injection attack.
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
✓
Implement row-level security (RLS) with a security policy that filters rows by tenant ID.
Row-level security (RLS) is the correct choice because it enforces data isolation at the database engine level by filtering rows based on a tenant ID predicate. Even if a SQL injection vulnerability allows an attacker to execute arbitrary queries, RLS ensures that only rows belonging to the attacker's tenant are returned, preventing cross-tenant data access. This is a defense-in-depth measure that works regardless of application-layer flaws.
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 Always Encrypted to encrypt sensitive columns.
Why it's wrong here
Always Encrypted protects column data but does not prevent access to other rows.
- ✗
Configure Azure SQL Database auditing to monitor cross-tenant access.
Why it's wrong here
Auditing is detective, not preventive.
- ✗
Enable Transparent Data Encryption (TDE) on the database.
Why it's wrong here
TDE encrypts the entire database at rest but does not control row access.
- ✓
Implement row-level security (RLS) with a security policy that filters rows by tenant ID.
Why this is correct
RLS provides row-level isolation.
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Last reviewed: Jun 24, 2026
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