- A
Create views that exclude sensitive columns and grant developers access to the views instead of the base tables.
Why wrong: Creating views that exclude sensitive columns would require altering the data model (adding views) and forcing developers to query views instead of tables, which may violate the requirement of no code changes.
- B
Configure dynamic data masking on the sensitive columns, and add the database administrator to the unmask permission.
Dynamic Data Masking can be applied directly to sensitive columns, automatically masking data for all users except those with unmask permission, meeting all requirements.
- C
Implement Always Encrypted with column encryption, and grant the developers access to the encryption keys.
Why wrong: Always Encrypted encrypts data at the client side and requires application code to use specific drivers and manage encryption keys, which contradicts the requirement of no application code changes.
- D
Create a row-level security policy that denies access to sensitive rows for developers.
Why wrong: Row-Level Security filters entire rows based on a predicate, but it does not mask individual column values; it can only deny access to entire rows, not obfuscate specific fields.
DP-300 Dynamic Data Masking 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. A key principle to apply: dynamic Data Masking. 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.
You are setting up a new Azure SQL Database for a development team. The database will contain test data that mimics production but with some sensitive fields obfuscated. You need to ensure that developers can query the database without seeing the actual sensitive data. The developers will use Microsoft Entra ID authentication. You have the following requirements: - The sensitive data should be automatically masked in query results for all developers except the database administrator. - The masking should be applied without modifying the application code. - The solution should be easy to manage and not require changes to the data model.
What should you implement?
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
Configure dynamic data masking on the sensitive columns, and add the database administrator to the unmask permission.
Option B is correct because Dynamic Data Masking (DDM) can be configured on sensitive columns to automatically mask data in query results without modifying application code or the data model. The database administrator can be added to the unmask permission to see the actual data. Option A is incorrect because creating views would require changes to the data model and application queries. Option C is incorrect because Always Encrypted requires application code changes to handle encryption/decryption. Option D is incorrect because Row-Level Security filters rows based on predicates, not columns, and does not mask data.
Key principle: Dynamic Data Masking
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Create views that exclude sensitive columns and grant developers access to the views instead of the base tables.
Why it's wrong here
Creating views that exclude sensitive columns would require altering the data model (adding views) and forcing developers to query views instead of tables, which may violate the requirement of no code changes.
- ✓
Configure dynamic data masking on the sensitive columns, and add the database administrator to the unmask permission.
Why this is correct
Dynamic Data Masking can be applied directly to sensitive columns, automatically masking data for all users except those with unmask permission, meeting all requirements.
Related concept
Dynamic Data Masking
- ✗
Implement Always Encrypted with column encryption, and grant the developers access to the encryption keys.
Why it's wrong here
Always Encrypted encrypts data at the client side and requires application code to use specific drivers and manage encryption keys, which contradicts the requirement of no application code changes.
- ✗
Create a row-level security policy that denies access to sensitive rows for developers.
Why it's wrong here
Row-Level Security filters entire rows based on a predicate, but it does not mask individual column values; it can only deny access to entire rows, not obfuscate specific fields.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Candidates often confuse Dynamic Data Masking with other security features like Always Encrypted or Row-Level Security. DDM masks data in query results at the database level without altering the underlying data or requiring application changes.
Detailed technical explanation
How to think about this question
Treat this as a scenario question. Identify the problem, the constraint, and the best action. Then compare each option against those facts.
KKey Concepts to Remember
- Dynamic Data Masking
- Unmask Permission
- Always Encrypted
- Row-Level Security
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
Dynamic Data Masking
Real-world example
How this comes up in practice
A company's IT admin needs to give a contractor read-only access to production logs without sharing account credentials. Using role-based access control (RBAC) and temporary scoped permissions — not a permanent shared password — is the correct pattern. Questions like this test whether you can apply least-privilege access across cloud identity services.
What to study next
Got this wrong? Here's your next step.
Review dynamic Data Masking, then practise related DP-300 questions on the same topic to reinforce the concept.
- →
Implement a secure environment — study guide chapter
Learn the concepts, then practise the questions
- →
Implement a secure environment practice questions
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Microsoft Azure Database Administrator Associate DP-300 study guide
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FAQ
Questions learners often ask
What does this DP-300 question test?
Implement a secure environment — This question tests Implement a secure environment — Dynamic Data Masking.
What is the correct answer to this question?
The correct answer is: Configure dynamic data masking on the sensitive columns, and add the database administrator to the unmask permission. — Option B is correct because Dynamic Data Masking (DDM) can be configured on sensitive columns to automatically mask data in query results without modifying application code or the data model. The database administrator can be added to the unmask permission to see the actual data. Option A is incorrect because creating views would require changes to the data model and application queries. Option C is incorrect because Always Encrypted requires application code changes to handle encryption/decryption. Option D is incorrect because Row-Level Security filters rows based on predicates, not columns, and does not mask data.
What should I do if I get this DP-300 question wrong?
Review dynamic Data Masking, then practise related DP-300 questions on the same topic to reinforce the concept.
What is the key concept behind this question?
Dynamic Data Masking
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Last reviewed: Jun 21, 2026
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