- A
TDE with a service-managed key, enforce TLS 1.2, and Always Encrypted with a column master key in Key Vault.
Why wrong: Service-managed key does not meet customer-managed key requirement.
- B
TDE with a customer-managed key in Key Vault, enforce TLS 1.2, and use Dynamic Data Masking.
Why wrong: Dynamic Data Masking is not encryption in use; it masks data at query time.
- C
TDE with a customer-managed key in Key Vault, enforce TLS 1.2, and Always Encrypted with a column master key stored in Windows Certificate Store.
Why wrong: Windows Certificate Store does not provide HSM-backed key storage.
- D
TDE with a customer-managed key in Azure Key Vault (HSM-backed), enforce TLS 1.2, and Always Encrypted with a column master key in Azure Key Vault (HSM-backed).
This combination meets all requirements: at rest, in transit, in use, and HSM-backed customer-managed keys.
Quick Answer
The correct answer is to combine TDE with a customer-managed key in an HSM-backed Azure Key Vault, enforce TLS 1.2, and implement Always Encrypted with a column master key also in an HSM-backed Key Vault. This configuration satisfies the full security mandate because TDE encrypts data at rest using a customer-managed key stored in a hardware security module, enforcing TLS 1.2 secures data in transit by preventing downgrade attacks, and Always Encrypted protects data in use by ensuring it remains encrypted during query processing, with the column master key likewise hardware-protected and customer-controlled. On the DP-300 exam, this scenario tests your ability to map each encryption state to the correct Azure feature, with a common trap being to confuse Always Encrypted with Transparent Data Encryption or to overlook that both TDE and Always Encrypted can leverage the same HSM-backed Key Vault for key management. A reliable memory tip is to think of the three states as “disk, wire, and compute”—TDE for disk, TLS for wire, and Always Encrypted for compute—and remember that customer-managed HSM keys require Azure Key Vault Premium or Managed HSM.
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 are deploying an Azure SQL Database that will contain highly sensitive personal data. The security policy requires that the data be encrypted at rest, in transit, and in use. Additionally, the encryption keys must be stored in a hardware security module (HSM) and be customer-managed. Which combination of features should you implement?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
TDE with a customer-managed key in Azure Key Vault (HSM-backed), enforce TLS 1.2, and Always Encrypted with a column master key in Azure Key Vault (HSM-backed).
Option D is correct because it satisfies all requirements: encryption at rest via TDE with a customer-managed key stored in an HSM-backed Key Vault, encryption in transit by enforcing TLS 1.2, and encryption in use via Always Encrypted with the column master key also stored in an HSM-backed Key Vault. This ensures that all three states of data are encrypted and that keys are both customer-managed and hardware-protected.
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.
- ✗
TDE with a service-managed key, enforce TLS 1.2, and Always Encrypted with a column master key in Key Vault.
Why it's wrong here
Service-managed key does not meet customer-managed key requirement.
- ✗
TDE with a customer-managed key in Key Vault, enforce TLS 1.2, and use Dynamic Data Masking.
Why it's wrong here
Dynamic Data Masking is not encryption in use; it masks data at query time.
- ✗
TDE with a customer-managed key in Key Vault, enforce TLS 1.2, and Always Encrypted with a column master key stored in Windows Certificate Store.
Why it's wrong here
Windows Certificate Store does not provide HSM-backed key storage.
- ✓
TDE with a customer-managed key in Azure Key Vault (HSM-backed), enforce TLS 1.2, and Always Encrypted with a column master key in Azure Key Vault (HSM-backed).
Why this is correct
This combination meets all requirements: at rest, in transit, in use, and HSM-backed customer-managed keys.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may confuse Dynamic Data Masking with encryption in use, or overlook that storing keys in Key Vault does not automatically imply HSM protection unless the vault is specifically HSM-backed.
Detailed technical explanation
How to think about this question
TDE with customer-managed keys in Azure Key Vault uses the vault's HSM-backed key option (Premium tier) to protect the TDE protector, which encrypts the database encryption key. Always Encrypted with column master keys in an HSM-backed Key Vault ensures that the column encryption keys are never exposed to the database engine in plaintext, even during query processing. In a real-world scenario, this combination is critical for compliance with regulations like GDPR or HIPAA that mandate full lifecycle encryption and customer-controlled key storage.
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.
What to study next
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FAQ
Questions learners often ask
What does this DP-300 question test?
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: TDE with a customer-managed key in Azure Key Vault (HSM-backed), enforce TLS 1.2, and Always Encrypted with a column master key in Azure Key Vault (HSM-backed). — Option D is correct because it satisfies all requirements: encryption at rest via TDE with a customer-managed key stored in an HSM-backed Key Vault, encryption in transit by enforcing TLS 1.2, and encryption in use via Always Encrypted with the column master key also stored in an HSM-backed Key Vault. This ensures that all three states of data are encrypted and that keys are both customer-managed and hardware-protected.
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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Last reviewed: Jun 24, 2026
This DP-300 practice question is part of Courseiva's free Microsoft certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the DP-300 exam.
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