The answer is that when azureAdOnlyAuthentication is set to true, the administratorLogin and administratorLoginPassword properties must not be specified. This is correct because enabling Azure AD-only authentication replaces SQL authentication entirely as the sole identity provider for the Azure SQL Database server, so the ARM template validation engine rejects any attempt to include SQL admin credentials, which would create a conflict between the two authentication methods. On the DP-300 exam, this scenario tests your understanding of how Azure AD-only authentication interacts with ARM template deployment—a common trap is assuming you can keep the SQL admin properties as fallback credentials, but the deployment will fail with a validation error. A reliable memory tip is to think of it as an exclusive switch: flipping azureAdOnlyAuthentication to true turns off the SQL admin login entirely, so leave those properties blank.
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.
Refer to the exhibit. You are reviewing an Azure Resource Manager template for deploying an Azure SQL Database server. The template sets publicNetworkAccess to Disabled, minimalTlsVersion to 1.2, and azureAdOnlyAuthentication to true. However, the deployment fails with an error. What is the most likely cause?
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
✓
When azureAdOnlyAuthentication is true, the administratorLogin and administratorLoginPassword properties must not be specified
When azureAdOnlyAuthentication is set to true in an Azure SQL Database ARM template, the administratorLogin and administratorLoginPassword properties must be omitted because Azure AD authentication replaces SQL authentication as the sole identity provider. Including these properties causes a validation conflict, as the deployment expects no SQL admin credentials when Azure AD-only authentication is enabled.
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.
✗
minimalTlsVersion 1.2 is not supported in Azure SQL Database
publicNetworkAccess Disabled requires a private endpoint to be defined in the same template
Why it's wrong here
A private endpoint can be created separately, but it is not mandatory in the same template.
✓
When azureAdOnlyAuthentication is true, the administratorLogin and administratorLoginPassword properties must not be specified
Why this is correct
Azure AD-only authentication disables SQL authentication, so providing SQL admin credentials is invalid.
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 password does not meet complexity requirements
Why it's wrong here
The password 'P@ssw0rd!' meets typical complexity requirements.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates assume the deployment fails due to a missing private endpoint or password issue, but the real conflict is the simultaneous presence of SQL admin credentials and Azure AD-only authentication, which the ARM template validation explicitly rejects.
Detailed technical explanation
How to think about this question
Azure AD-only authentication enforces that all authentication to the logical server must use Azure AD identities, eliminating the SQL Server admin login. Under the hood, the ARM resource provider checks for the presence of administratorLogin and administratorLoginPassword when azureAdOnlyAuthentication is true and rejects the deployment with a validation error. This design aligns with security best practices to prevent fallback to SQL authentication and is enforced at the control plane level.
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: When azureAdOnlyAuthentication is true, the administratorLogin and administratorLoginPassword properties must not be specified — When azureAdOnlyAuthentication is set to true in an Azure SQL Database ARM template, the administratorLogin and administratorLoginPassword properties must be omitted because Azure AD authentication replaces SQL authentication as the sole identity provider. Including these properties causes a validation conflict, as the deployment expects no SQL admin credentials when Azure AD-only authentication is enabled.
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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