The correct answer is that the databases still have the service-managed key as protector and need to be updated. This is because when you configure a customer-managed key as the encryption protector at the Azure SQL Server level, that setting applies only to newly created databases; existing databases retain their original encryption protector, which is typically the service-managed key. The technical concept here is that the server-level encryption protector is not retroactive—it does not automatically re-encrypt existing databases. On the Microsoft Azure Database Administrator Associate DP-300 exam, this scenario tests your understanding of Transparent Data Encryption (TDE) lifecycle management and the distinction between server-level and database-level encryption settings. A common trap is assuming that changing the server’s protector propagates to all databases, but you must manually update each database using the ALTER DATABASE ENCRYPTION KEY statement or the Azure portal. Memory tip: think of the server protector as a “default for new kids on the block”—existing databases need a personal invitation to switch keys.
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 reviewing the encryption protector for an Azure SQL Server as shown in the exhibit. The server hosts multiple databases. You need to ensure that the databases are encrypted using the customer-managed key from Azure Key Vault. However, you find that the databases are not using this key. What is the most likely reason?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The databases still have the service-managed key as protector and need to be updated.
The exhibit shows that the server's encryption protector is set to a customer-managed key from Azure Key Vault, but this setting only applies to newly created databases. Existing databases retain their original encryption protector, which is typically the service-managed key. To enforce the customer-managed key on existing databases, you must manually update each database's encryption protector using the ALTER DATABASE ENCRYPTION KEY statement or through the Azure portal. Option C correctly identifies that the databases still have the service-managed key as protector and need to be updated.
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.
✗
The key version '123456' is incorrect.
Why it's wrong here
The version appears valid.
✗
The key vault is in a different subscription and not accessible.
Why it's wrong here
The URI indicates the vault is accessible.
✓
The databases still have the service-managed key as protector and need to be updated.
Why this is correct
Existing databases may not automatically switch to CMK.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
The 'serverKeyName' property is not set correctly.
Why it's wrong here
The key name is present.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates assume setting the server-level encryption protector automatically applies to all existing databases, but Azure SQL Database requires explicit per-database updates to change the protector.
Detailed technical explanation
How to think about this question
In Azure SQL Database, the encryption protector is a server-level setting that defines the key used for Transparent Data Encryption (TDE). However, this setting only affects databases created after the change; existing databases retain their previous protector (service-managed or customer-managed). To migrate an existing database to use the new protector, you must run 'ALTER DATABASE CURRENT SET ENCRYPTION PROTECTOR' or use the Azure portal to rotate the key for each database. This behavior is by design to avoid disrupting ongoing operations and ensures that key rotation is a controlled, database-by-database process.
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: The databases still have the service-managed key as protector and need to be updated. — The exhibit shows that the server's encryption protector is set to a customer-managed key from Azure Key Vault, but this setting only applies to newly created databases. Existing databases retain their original encryption protector, which is typically the service-managed key. To enforce the customer-managed key on existing databases, you must manually update each database's encryption protector using the ALTER DATABASE ENCRYPTION KEY statement or through the Azure portal. Option C correctly identifies that the databases still have the service-managed key as protector and need to be updated.
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: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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