This DP-900 practice question tests your understanding of identify considerations for relational data on azure. 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.
Which TWO features are available in Azure SQL Database to help protect data at rest?
Transparent Data Encryption (TDE)
TDE encrypts the entire database at rest.
Dynamic Data Masking
Why wrong: Dynamic Data Masking does not encrypt data; it masks it.
Always Encrypted
Always Encrypted encrypts column data at rest and in transit.
Auditing
Why wrong: Auditing is for logging, not encryption.
Row-Level Security
Why wrong: Row-Level Security controls access, not encryption.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Transparent Data Encryption (TDE)
Option A and Option C are correct. Transparent Data Encryption encrypts the database files at rest. Always Encrypted encrypts sensitive columns at rest and in use. Option B is wrong because Dynamic Data Masking does not encrypt data; it masks it in query results. Option D is wrong because Auditing is for tracking, not encryption. Option E is wrong because Row-Level Security controls access, not encryption.
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
For each option: why learners choose it and why it is or isn't the right answer here.
Transparent Data Encryption (TDE)
Dynamic Data Masking
Why it's wrong here
Dynamic Data Masking does not encrypt data; it masks it.
Always Encrypted
Auditing
Why it's wrong here
Auditing is for logging, not encryption.
Row-Level Security
Why it's wrong here
Row-Level Security controls access, not encryption.
Common exam traps
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
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.
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
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
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-900 subnetting questions on CIDR, address ranges, and subnet selection.
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FAQ
Identify considerations for relational data on Azure — This question tests Identify considerations for relational data on Azure — CIDR notation defines the prefix length..
The correct answer is: Transparent Data Encryption (TDE) — Option A and Option C are correct. Transparent Data Encryption encrypts the database files at rest. Always Encrypted encrypts sensitive columns at rest and in use. Option B is wrong because Dynamic Data Masking does not encrypt data; it masks it in query results. Option D is wrong because Auditing is for tracking, not encryption. Option E is wrong because Row-Level Security controls access, not encryption.
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-900 subnetting questions on CIDR, address ranges, and subnet selection.
CIDR notation defines the prefix length.
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Last reviewed: Jun 20, 2026
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