Question 343 of 953

Implement a secure environment →hardMultiple ChoiceObjective-mapped

Quick Answer

The correct answer is to configure dynamic data masking (DDM) on the sensitive columns and define a masking policy that excludes the compliance officers based on their UPN. This works because DDM operates at the query result level, automatically obscuring sensitive data like Social Security Numbers from unauthorized users without altering the underlying database or requiring application code changes. By setting a masking rule that excludes users whose user principal name matches a specific pattern—such as '@compliance.gov'—you ensure that only those compliance officers see the full data, while all others see the masked output. On the DP-300 exam, this scenario tests your understanding of DDM as a lightweight, policy-based security feature distinct from row-level security, which filters rows, or Always Encrypted, which requires client-side decryption. A common trap is confusing DDM with column-level permissions, but DDM does not block access—it simply hides the data. Memory tip: think of DDM as a “privacy curtain” that parts only for specific UPNs, not a locked door.

DP-300 Implement a secure environment Practice Question

This DP-300 practice question tests your understanding of implement a secure environment. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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.

You are a database administrator for a government agency that uses Azure SQL Database to store classified data. The database contains highly sensitive columns (e.g., Social Security Numbers) that must be masked for most users, but fully visible to a small group of compliance officers. The compliance officers authenticate using Microsoft Entra ID. You need to implement a solution that automatically masks the sensitive columns for all users except the compliance officers, without requiring application code changes. The solution must also ensure that the compliance officers are identified by their Microsoft Entra ID user principal name (UPN). What should you do?

Question 1hardmultiple choice

Full question →

A
Grant SELECT permission on the sensitive columns only to the compliance officers and deny SELECT to all other users
Why wrong: This would cause errors for other users when querying the table, rather than masking the data. It also requires application changes to handle the error.
B
Use Always Encrypted to encrypt the sensitive columns and configure the column master key to allow access only to compliance officers
Why wrong: Always Encrypted encrypts data at the column level but requires application changes to handle encryption keys and is transparent to the database.
C
Implement row-level security (RLS) to filter rows based on user's UPN
Why wrong: RLS filters rows, not columns. It cannot mask individual columns.
D
Configure dynamic data masking (DDM) on the sensitive columns and define a masking policy that excludes the compliance officers based on their UPN
DDM masks data at the column level for low-privileged users. You can exclude specific users by adding them to the excluded users list for each masking rule.

Full breakdown with real-world context →

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 (DDM) on the sensitive columns and define a masking policy that excludes the compliance officers based on their UPN

Option C is correct. Dynamic data masking (DDM) masks sensitive columns based on the user's identity. You can define a masking policy that excludes users with a specific UPN pattern (e.g., '@compliance.gov'). Option A is wrong because row-level security filters rows, not columns. Option B is wrong because always encrypted encrypts data and requires application changes. Option D is wrong because column-level security (GRANT permissions) requires application changes to handle permission errors and does not mask data.

Key principle: Count usable hosts — not total addresses — and remember that the network and broadcast addresses are not available to hosts in standard IPv4 subnets.

Answer analysis

Option-by-option breakdown

For each option: why learners choose it and why it is or isn't the right answer here.

✗
Grant SELECT permission on the sensitive columns only to the compliance officers and deny SELECT to all other users
Why it's wrong here
This would cause errors for other users when querying the table, rather than masking the data. It also requires application changes to handle the error.
✗
Use Always Encrypted to encrypt the sensitive columns and configure the column master key to allow access only to compliance officers
Why it's wrong here
Always Encrypted encrypts data at the column level but requires application changes to handle encryption keys and is transparent to the database.
✗
Implement row-level security (RLS) to filter rows based on user's UPN
Why it's wrong here
RLS filters rows, not columns. It cannot mask individual columns.
✓
Configure dynamic data masking (DDM) on the sensitive columns and define a masking policy that excludes the compliance officers based on their UPN
Why this is correct
DDM masks data at the column level for low-privileged users. You can exclude specific users by adding them to the excluded users list for each masking rule.
Related concept
CIDR notation defines the prefix length.

Common exam traps

Common exam trap: usable hosts are not the same as total addresses

Subnetting questions often tempt you into counting all addresses. In normal IPv4 subnets, the network and broadcast addresses are not usable host addresses.

Detailed technical explanation

How to think about this question

Subnetting questions test whether you can identify the network, broadcast address, usable range, mask and correct subnet. Slow down enough to calculate the block size correctly.

KKey Concepts to Remember

CIDR notation defines the prefix length.
Block size helps identify subnet boundaries.
Network and broadcast addresses are not usable hosts in normal IPv4 subnets.
The required host count determines the smallest suitable subnet.

TExam Day Tips

Write the block size before choosing the subnet.
Check whether the question asks for hosts, subnets or a specific address range.
Do not confuse /24, /25, /26 and /27 host counts.

Key takeaway

Count usable hosts — not total addresses — and remember that the network and broadcast addresses are not available to hosts in standard IPv4 subnets.

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 block sizes, usable host formulas (2^n − 2), and how to find network and broadcast addresses for /24 through /30. Then practise related DP-300 subnetting questions on CIDR, address ranges, and subnet selection.

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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 — CIDR notation defines the prefix length..

What is the correct answer to this question?

The correct answer is: Configure dynamic data masking (DDM) on the sensitive columns and define a masking policy that excludes the compliance officers based on their UPN — Option C is correct. Dynamic data masking (DDM) masks sensitive columns based on the user's identity. You can define a masking policy that excludes users with a specific UPN pattern (e.g., '@compliance.gov'). Option A is wrong because row-level security filters rows, not columns. Option B is wrong because always encrypted encrypts data and requires application changes. Option D is wrong because column-level security (GRANT permissions) requires application changes to handle permission errors and does not mask data.

What should I do if I get this DP-300 question wrong?

What is the key concept behind this question?

CIDR notation defines the prefix length.

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