The correct answer is Transparent Data Encryption (TDE), Always Encrypted, and enforcing TLS 1.2 or higher. TDE encrypts the entire database at rest, including the credit card column, while Always Encrypted provides client-side encryption of the specific column so that even database administrators cannot view the plaintext data. TLS 1.2 or higher then secures the data in transit between the application and Azure SQL Database, ensuring that all queries and results are encrypted over the network. On the DP-300 exam, this scenario tests your ability to layer encryption technologies for comprehensive protection, as no single feature covers both at-rest and in-transit column-level encryption. A common trap is choosing only TDE for at-rest encryption and forgetting that Always Encrypted is needed for column-level granularity, or assuming TLS alone handles at-rest data. Remember the mnemonic “TAT”: TDE for rest, Always Encrypted for the column, and TLS for transit.
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 need to ensure that all queries accessing a specific column containing credit card numbers are encrypted both at rest and in transit between the application and Azure SQL Database. Which THREE technologies should you implement? (Choose three.)
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Enforce TLS 1.2 or higher for client connections
Option A is correct because enforcing TLS 1.2 or higher for client connections encrypts data in transit between the application and Azure SQL Database. TLS ensures that all queries and their results, including the credit card column, are protected from interception during network transmission.
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.
✓
Enforce TLS 1.2 or higher for client connections
Why this is correct
TLS encrypts data in transit between application and database.
Related concept
Read the scenario before looking for a memorised answer.
✓
Always Encrypted with column encryption key stored in Azure Key Vault
Why this is correct
Always Encrypted encrypts column data at rest and in transit from client.
Related concept
Read the scenario before looking for a memorised answer.
Read the scenario before looking for a memorised answer.
✗
Row-Level Security
Why it's wrong here
RLS restricts row access but does not encrypt data.
✗
Dynamic Data Masking
Why it's wrong here
Masking hides data from users but does not encrypt it.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse Dynamic Data Masking or Row-Level Security with encryption, but neither provides actual encryption of data at rest or in transit, which is explicitly required by the question.
Detailed technical explanation
How to think about this question
Always Encrypted with column encryption key stored in Azure Key Vault ensures that the credit card column is encrypted at rest and remains encrypted in transit between the application and the database, as the encryption/decryption occurs on the client side. Transparent Data Encryption (TDE) encrypts the entire database at rest, including the credit card column, using a database encryption key (DEK) stored in the database boot record. Together, these three technologies provide a defense-in-depth approach: TDE for storage-level encryption, Always Encrypted for column-level encryption with client-side key management, and TLS for network encryption.
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 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 DP-300 question in full detail.
Implement a secure environment — This question tests Implement a secure environment — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Enforce TLS 1.2 or higher for client connections — Option A is correct because enforcing TLS 1.2 or higher for client connections encrypts data in transit between the application and Azure SQL Database. TLS ensures that all queries and their results, including the credit card column, are protected from interception during network transmission.
What should I do if I get this DP-300 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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