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.
Your company is migrating on-premises SQL Server databases to Azure SQL Database. As part of security compliance, you must ensure that all data at rest is encrypted using customer-managed keys stored in Azure Key Vault. Which Azure SQL Database feature should you enable?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Transparent Data Encryption with customer-managed keys in Azure Key Vault
Transparent Data Encryption (TDE) with customer-managed keys in Azure Key Vault is the correct feature because it encrypts SQL Server, Azure SQL Database, and Azure Synapse data files at rest using a customer-controlled key stored in Azure Key Vault. This meets the compliance requirement for encrypting all data at rest with customer-managed keys, as TDE performs real-time I/O encryption and decryption of the database, backups, and transaction log files without requiring application changes.
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.
✗
Dynamic Data Masking
Why it's wrong here
Dynamic Data Masking obfuscates data to non-privileged users but does not encrypt at rest.
✗
Always Encrypted
Why it's wrong here
Always Encrypted encrypts data in memory and during queries, not at rest.
✗
Row-Level Security
Why it's wrong here
Row-Level Security restricts row access based on user identity, not encryption.
✓
Transparent Data Encryption with customer-managed keys in Azure Key Vault
Why this is correct
TDE with CMK encrypts the database at rest using keys stored in Key Vault.
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 often confuse 'Always Encrypted' (which protects sensitive columns from DBAs) with 'Transparent Data Encryption' (which encrypts the entire database at rest), leading them to select Always Encrypted when the requirement is for full data-at-rest encryption with customer-managed keys.
Detailed technical explanation
How to think about this question
TDE with customer-managed keys uses the 'TDE protector' stored in Azure Key Vault, which is an asymmetric key (RSA 2048 or 3072) that encrypts the database encryption key (DEK). The DEK, a symmetric key stored in the database boot record, is then used for actual I/O encryption. A subtle behavior is that when using customer-managed keys, you must grant the Azure SQL logical server 'Get, WrapKey, UnwrapKey' permissions on the Key Vault, and if the key is disabled or revoked, the database becomes inaccessible within minutes.
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 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: Transparent Data Encryption with customer-managed keys in Azure Key Vault — Transparent Data Encryption (TDE) with customer-managed keys in Azure Key Vault is the correct feature because it encrypts SQL Server, Azure SQL Database, and Azure Synapse data files at rest using a customer-controlled key stored in Azure Key Vault. This meets the compliance requirement for encrypting all data at rest with customer-managed keys, as TDE performs real-time I/O encryption and decryption of the database, backups, and transaction log files without requiring application changes.
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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Question Discussion
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