The answer is to implement Always Encrypted with secure enclaves and store the column master key in Azure Key Vault with access granted only to the application. This configuration prevents DBAs from viewing plaintext credit card numbers because the secure enclave processes encrypted data within a trusted execution environment, ensuring the data remains encrypted even during computations, while the column master key in Azure Key Vault is never accessible to database administrators. On the DP-300 exam, this scenario tests your understanding of how secure enclaves extend Always Encrypted to protect data in use, a critical requirement for PCI DSS compliance that goes beyond simply encrypting data at rest or in transit. A common trap is assuming that column-level encryption alone is sufficient, but without secure enclaves, DBAs with access to the database server could still intercept the decryption keys. Memory tip: think “enclave equals encryption everywhere” — the enclave keeps data encrypted even while being processed, so the DBA never sees plaintext.
DP-300 Implement a secure environment Practice Question
This DP-300 practice question tests your understanding of implement a secure environment. 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.
You are configuring Azure SQL Database for a financial application that must meet PCI DSS compliance. The database contains credit card numbers stored in a column encrypted with Always Encrypted. You need to ensure that database administrators cannot view the plaintext credit card numbers while allowing application users with the proper credentials to access them. What should you implement?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "always"
Why it matters: Absolute qualifier. An answer using 'always' is only correct if there are genuinely no exceptions — absolute statements are often wrong in networking.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Use Always Encrypted with secure enclaves and store the column master key in Azure Key Vault with access granted only to the application
Always Encrypted with secure enclaves ensures that credit card numbers are encrypted at all times, including during computation, and that the column master key is stored in Azure Key Vault with access granted only to the application. This prevents database administrators (DBAs) from viewing plaintext data because they never have access to the column master key, while authorized application users can decrypt the data via the client driver. This meets PCI DSS requirements for protecting cardholder data at rest and in use.
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.
✗
Use column-level encryption with a certificate stored in the database
Why it's wrong here
DBAs with access to the database can retrieve the certificate and decrypt data.
✗
Enable Transparent Data Encryption (TDE)
Why it's wrong here
TDE encrypts data at rest but does not protect against DBAs viewing plaintext data.
✓
Use Always Encrypted with secure enclaves and store the column master key in Azure Key Vault with access granted only to the application
Why this is correct
Always Encrypted ensures that only authorized clients can decrypt data, and secure enclaves allow computations without exposing data to DBAs.
Clue confirmation
The clue word "always" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
Implement Dynamic Data Masking (DDM)
Why it's wrong here
DDM can be bypassed by users with db_owner role.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse Dynamic Data Masking (DDM) with encryption, mistakenly believing that masking prevents administrators from seeing data, when in fact DDM can be bypassed by users with db_owner or CONTROL permissions, whereas Always Encrypted cryptographically enforces separation of duties.
Detailed technical explanation
How to think about this question
Always Encrypted with secure enclaves uses a column master key (CMK) stored in Azure Key Vault and a column encryption key (CEK) that is encrypted by the CMK. The enclave (e.g., Intel SGX) allows computations on encrypted data without exposing plaintext to the SQL Server engine, ensuring that even the database engine never sees unencrypted values. In practice, this means that even if a DBA runs a SELECT * query, the encrypted column returns ciphertext, and only the application with the proper client-side credentials can decrypt it.
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: Use Always Encrypted with secure enclaves and store the column master key in Azure Key Vault with access granted only to the application — Always Encrypted with secure enclaves ensures that credit card numbers are encrypted at all times, including during computation, and that the column master key is stored in Azure Key Vault with access granted only to the application. This prevents database administrators (DBAs) from viewing plaintext data because they never have access to the column master key, while authorized application users can decrypt the data via the client driver. This meets PCI DSS requirements for protecting cardholder data at rest and in use.
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.
Are there clue words in this question I should notice?
Yes — watch for: "always". Absolute qualifier. An answer using 'always' is only correct if there are genuinely no exceptions — absolute statements are often wrong in networking.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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