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.
A company has an Azure SQL Database that stores personally identifiable information (PII) in columns. They need to encrypt those columns so that only authorized applications can decrypt the data, and even database administrators cannot view the plaintext. Additionally, they need to support equality comparisons (WHERE clauses) on the encrypted columns. Which encryption technology should they use?
Deterministic encryption supports equality comparisons because the same plaintext always produces the same ciphertext, allowing the database to perform WHERE clauses.
B
Always Encrypted with randomized encryption
Why wrong: Randomized encryption produces different ciphertext for the same plaintext, so equality comparisons are not supported.
C
Transparent Data Encryption (TDE)
Why wrong: TDE encrypts data at rest but DBAs with appropriate permissions can still query the data in plaintext.
D
Dynamic Data Masking
Why wrong: Dynamic Data Masking only hides data in query results; the actual data in the database is not encrypted and can be read by DBAs.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Always Encrypted with deterministic encryption
Always Encrypted with deterministic encryption is the correct choice because it encrypts PII columns at the client side, ensuring that even database administrators cannot view plaintext data. Deterministic encryption generates the same ciphertext for the same plaintext, which allows equality comparisons (WHERE clauses) on encrypted columns, meeting the requirement for query support.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✓
Always Encrypted with deterministic encryption
Why this is correct
Deterministic encryption supports equality comparisons because the same plaintext always produces the same ciphertext, allowing the database to perform WHERE clauses.
Related concept
Read the scenario before looking for a memorised answer.
✗
Always Encrypted with randomized encryption
Why it's wrong here
Randomized encryption produces different ciphertext for the same plaintext, so equality comparisons are not supported.
✗
Transparent Data Encryption (TDE)
Why it's wrong here
TDE encrypts data at rest but DBAs with appropriate permissions can still query the data in plaintext.
✗
Dynamic Data Masking
Why it's wrong here
Dynamic Data Masking only hides data in query results; the actual data in the database is not encrypted and can be read by DBAs.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse Always Encrypted with TDE, thinking TDE provides client-side encryption and column-level query support, but TDE only encrypts data at rest and does not prevent database administrators from seeing plaintext data in memory or during queries.
Detailed technical explanation
How to think about this question
Always Encrypted with deterministic encryption uses a column encryption key (CEK) protected by a column master key (CMK) stored in Azure Key Vault or Windows Certificate Store. The deterministic mode leverages a fixed initialization vector (IV) and AES-256-CBC to ensure repeatable ciphertext for equality searches, but it is vulnerable to frequency analysis attacks if the column has low cardinality. In practice, this trade-off is acceptable for PII columns like Social Security numbers where equality lookups are common, but randomized encryption should be used for columns with high sensitivity or where pattern analysis is a concern.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
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
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A cloud solutions architect for a retail company is evaluating services for a new workload. The correct answer here reflects best practice for the specific scenario described — not a general cloud recommendation. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Cloud exam questions reward reading the constraint carefully: the same technology can be right or wrong depending on the use case.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this AZ-500 question in full detail.
Secure compute, storage, and databases — This question tests Secure compute, storage, and databases — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Always Encrypted with deterministic encryption — Always Encrypted with deterministic encryption is the correct choice because it encrypts PII columns at the client side, ensuring that even database administrators cannot view plaintext data. Deterministic encryption generates the same ciphertext for the same plaintext, which allows equality comparisons (WHERE clauses) on encrypted columns, meeting the requirement for query support.
What should I do if I get this AZ-500 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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