The answer is Always Encrypted. This Azure SQL Database feature ensures tenant isolation in a multitenant SaaS application by encrypting sensitive data at the client side, so the database engine never sees plaintext values—meaning even if application code has a bug or is compromised, one tenant cannot read another tenant’s encrypted data. On the Microsoft Azure Security Engineer Associate AZ-500 exam, this scenario tests your understanding of defense-in-depth for data at rest and in use, often appearing as a trap where candidates mistakenly choose Row-Level Security (RLS), which can be bypassed by application logic, or Dynamic Data Masking, which only hides data from non-privileged users but does not prevent access. Always Encrypted is the only option that guarantees the database engine itself cannot decrypt the data, making it the correct choice for strong tenant isolation. Memory tip: “Always Encrypted = Always hidden from the engine.”
AZ-500 Secure compute, storage, and databases Practice Question
This AZ-500 practice question tests your understanding of secure compute, storage, and databases. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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.
Your company uses Azure SQL Database for a multitenant SaaS application. You need to ensure that one tenant cannot access another tenant's data, even if the application code has a bug. Which Azure SQL Database feature should you implement?
Why wrong: DDM masks data to non-privileged users but does not prevent access to the underlying data.
B
Azure SQL Database Auditing
Why wrong: Auditing logs access but does not prevent unauthorized access.
C
Always Encrypted
Always Encrypted ensures that sensitive data is encrypted at the client and never exposed to the database engine, preventing unauthorized access from the database side.
D
Row-Level Security (RLS)
Why wrong: RLS is applied by the database engine but can be bypassed if the app runs with elevated permissions.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Always Encrypted
Always Encrypted ensures that the database engine never sees plaintext data; even if the app code is compromised, tenants cannot read each other's encrypted data. Option B is correct. Option A (Row-Level Security) is bypassed by app code. Option C (Dynamic Data Masking) does not prevent access. Option D (Auditing) only tracks access.
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.
✗
Dynamic Data Masking (DDM)
Why it's wrong here
DDM masks data to non-privileged users but does not prevent access to the underlying data.
✗
Azure SQL Database Auditing
Why it's wrong here
Auditing logs access but does not prevent unauthorized access.
✓
Always Encrypted
Why this is correct
Always Encrypted ensures that sensitive data is encrypted at the client and never exposed to the database engine, preventing unauthorized access from the database side.
RLS is applied by the database engine but can be bypassed if the app runs with elevated permissions.
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.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this AZ-500 question in full detail.
Review block sizes, usable host formulas (2^n − 2), and how to find network and broadcast addresses for /24 through /30. Then practise related AZ-500 subnetting questions on CIDR, address ranges, and subnet selection.
Secure compute, storage, and databases — This question tests Secure compute, storage, and databases — CIDR notation defines the prefix length..
What is the correct answer to this question?
The correct answer is: Always Encrypted — Always Encrypted ensures that the database engine never sees plaintext data; even if the app code is compromised, tenants cannot read each other's encrypted data. Option B is correct. Option A (Row-Level Security) is bypassed by app code. Option C (Dynamic Data Masking) does not prevent access. Option D (Auditing) only tracks access.
What should I do if I get this AZ-500 question wrong?
Review block sizes, usable host formulas (2^n − 2), and how to find network and broadcast addresses for /24 through /30. Then practise related AZ-500 subnetting questions on CIDR, address ranges, and subnet selection.
What is the key concept behind this question?
CIDR notation defines the prefix length.
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Question Discussion
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