The answer is granting the managed instance identity the 'Directory Readers' role in Microsoft Entra ID, along with enabling a system-assigned managed identity for the instance and configuring Microsoft Entra admin credentials. This is required because Azure SQL Managed Instance uses its system-assigned managed identity to authenticate against Microsoft Entra ID, allowing it to securely fetch tokens and perform directory lookups for user authentication and authorization; without the Directory Readers role, the instance cannot read directory objects needed to validate logins. On the DP-300 exam, this prerequisite often appears as a trick where candidates mistakenly select user-assigned identities or forget that the role must be assigned in Microsoft Entra ID, not within SQL Server. A common trap is assuming that simply enabling Microsoft Entra authentication in the portal is enough, but the instance’s identity must explicitly hold the Directory Readers permission to function. Remember the mnemonic “MI-DR” for Managed Identity needs Directory Readers.
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.
Which THREE of the following are required to configure Microsoft Entra authentication for an Azure SQL Managed Instance?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Enable the managed instance system-assigned managed identity.
Enabling the system-assigned managed identity for Azure SQL Managed Instance is required because Microsoft Entra authentication relies on this identity to authenticate the instance itself against Microsoft Entra ID. Without a managed identity, the instance cannot securely obtain tokens or perform directory lookups needed for authentication and authorization.
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.
✓
Enable the managed instance system-assigned managed identity.
Why this is correct
The managed identity is used to authenticate to Entra ID.
Related concept
Read the scenario before looking for a memorised answer.
✓
Set a Microsoft Entra admin for the managed instance.
Why this is correct
An Entra admin must be configured to enable Entra authentication.
Related concept
Read the scenario before looking for a memorised answer.
✗
Ensure the managed instance is deployed in a different virtual network from the clients.
Why it's wrong here
VNet placement is independent of Entra authentication.
✓
Grant the managed instance identity the 'Directory Readers' role in Microsoft Entra ID.
Why this is correct
This permission allows the instance to query Entra ID for user/group membership.
Related concept
Read the scenario before looking for a memorised answer.
✗
Configure the managed instance to allow public network access.
Why it's wrong here
Public network access is not required; Entra auth works over private connections.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse the 'Directory Readers' role assignment (which is required) with optional network settings like VNet isolation or public access, leading them to incorrectly select C or E as necessary steps.
Detailed technical explanation
How to think about this question
Under the hood, the managed instance's system-assigned managed identity is used to request OAuth 2.0 tokens from Microsoft Entra ID, which are then presented to Azure SQL for authentication. The 'Directory Readers' role (Option D) is also required to allow the instance to read directory objects (e.g., group memberships) for authorization decisions. In a real-world scenario, if the managed identity lacks this role, Entra authentication will fail with permission errors even if the admin is set.
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: Enable the managed instance system-assigned managed identity. — Enabling the system-assigned managed identity for Azure SQL Managed Instance is required because Microsoft Entra authentication relies on this identity to authenticate the instance itself against Microsoft Entra ID. Without a managed identity, the instance cannot securely obtain tokens or perform directory lookups needed for authentication and authorization.
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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