The correct answer is Always Encrypted, because it provides column-level encryption with transparent querying, allowing authorized applications to retrieve encrypted credit card numbers without application code changes. This feature works by encrypting sensitive data at the client side using a column encryption key, then storing the ciphertext in the database; when a query is executed, the client driver automatically decrypts the data for authorized users, ensuring unauthorized access is blocked even from database administrators. On the AZ-500 exam, this scenario tests your ability to distinguish between encryption solutions: TDE encrypts the entire database at rest but lacks column granularity, Dynamic Data Masking only obscures data without encryption, and Azure Storage encryption is irrelevant for SQL Database. A common trap is confusing masking with encryption—remember that masking hides data visually but does not protect it from being read in backups or logs. Memory tip: “Always Encrypted = column-level + client-side decryption” for transparent querying.
AZ-500 Secure compute, storage, and databases Practice Question
This AZ-500 practice question tests your understanding of secure compute, storage, and databases. 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 have an Azure SQL Database that stores financial data. You need to prevent unauthorized access by encrypting specific columns containing credit card numbers. The solution must allow authorized applications to query the data transparently. What should you implement?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Always Encrypted
Option D is correct because Always Encrypted encrypts sensitive columns and allows authorized applications to decrypt transparently using the client driver. Option A is wrong because TDE encrypts the entire database at rest but does not provide column-level granularity or transparent querying for applications. Option B is wrong because Dynamic Data Masking only masks data but does not encrypt it. Option C is wrong because Azure Storage encryption applies to Azure Storage, not SQL Database.
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.
✗
Azure Storage service encryption
Why it's wrong here
This applies to Azure Storage, not Azure SQL Database.
✗
Transparent Data Encryption (TDE)
Why it's wrong here
TDE encrypts the entire database at rest, not specific columns, and does not allow transparent decryption for queries.
✗
Dynamic Data Masking
Why it's wrong here
Dynamic Data Masking hides data from unauthorized users but does not encrypt it.
✓
Always Encrypted
Why this is correct
Always Encrypted encrypts specific columns and allows authorized applications to decrypt transparently.
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 media company stores terabytes of video archives that are accessed once a year for audit purposes. Moving these objects to a cold storage tier (Azure Archive, S3 Glacier, or Google Nearline) costs a fraction of hot storage. Questions like this test whether you understand storage tiers, access frequency tradeoffs, and retrieval latency requirements.
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 — Option D is correct because Always Encrypted encrypts sensitive columns and allows authorized applications to decrypt transparently using the client driver. Option A is wrong because TDE encrypts the entire database at rest but does not provide column-level granularity or transparent querying for applications. Option B is wrong because Dynamic Data Masking only masks data but does not encrypt it. Option C is wrong because Azure Storage encryption applies to Azure Storage, not SQL Database.
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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