The correct answer is to set the public endpoint to 'Disabled' and configure a private endpoint in the same virtual network with a private DNS zone. This configuration is necessary because Azure SQL Managed Instance, by default, allows public traffic unless explicitly turned off; disabling the public endpoint ensures no external connections can reach the instance, while the private endpoint assigns it a private IP within your virtual network. The private DNS zone is critical here—it maps the managed instance’s FQDN to that private IP, so client applications automatically resolve to the private endpoint instead of attempting a public connection. On the DP-300 exam, this scenario tests your understanding of network isolation for managed instances, often appearing as a design question where a common trap is forgetting the DNS zone linkage, leaving clients unable to resolve the private IP. A helpful memory tip: “Disable public, enable private, and don’t forget the DNS tie.”
DP-300 Implement a secure environment Practice Question
This DP-300 practice question tests your understanding of implement a secure environment. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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 designing a secure environment for Azure SQL Managed Instance. You need to ensure that all connections from client applications use a private endpoint, and no public endpoint is accessible. What should you configure?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Set the public endpoint to 'Disabled' and configure a private endpoint in the same virtual network with a private DNS zone.
Option C is correct because Azure SQL Managed Instance requires the public endpoint to be explicitly disabled to ensure no public traffic can reach it. By configuring a private endpoint within the same virtual network and linking it to a private DNS zone, client applications resolve the managed instance's fully qualified domain name (FQDN) to the private IP address, enforcing all connections through the private endpoint and eliminating public endpoint accessibility.
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.
✗
Set the public endpoint to 'Enabled' and create a firewall rule with a deny-all rule.
Why it's wrong here
The public endpoint is still accessible.
✗
Enable the public endpoint and use a VNet service tag in a firewall rule.
Why it's wrong here
A service tag still allows public endpoint traffic.
✓
Set the public endpoint to 'Disabled' and configure a private endpoint in the same virtual network with a private DNS zone.
Why this is correct
This completely removes public access and forces private connections.
Related concept
Read the scenario before looking for a memorised answer.
✗
Use a VNet service endpoint for Azure SQL Managed Instance and configure a network security group.
Why it's wrong here
Service endpoints are for Azure SQL Database, not Managed Instance.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse Azure SQL Database's firewall rules and service endpoints with Azure SQL Managed Instance's networking model, where only private endpoints can fully disable public access, and service endpoints are not a valid option for Managed Instance.
Detailed technical explanation
How to think about this question
When the public endpoint is disabled on Azure SQL Managed Instance, the instance's DNS name resolves only within the virtual network via a private DNS zone, which automatically creates an A record mapping the FQDN to the private endpoint's IP address. Under the hood, the private endpoint uses a network interface (NIC) in the VNet with a private IP, and traffic flows through the Microsoft backbone network, never traversing the public internet. A real-world scenario is a financial application requiring compliance with PCI DSS, where any public endpoint exposure is prohibited; disabling the public endpoint and using a private endpoint ensures that all traffic remains within the customer's virtual network boundary.
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: Set the public endpoint to 'Disabled' and configure a private endpoint in the same virtual network with a private DNS zone. — Option C is correct because Azure SQL Managed Instance requires the public endpoint to be explicitly disabled to ensure no public traffic can reach it. By configuring a private endpoint within the same virtual network and linking it to a private DNS zone, client applications resolve the managed instance's fully qualified domain name (FQDN) to the private IP address, enforcing all connections through the private endpoint and eliminating public endpoint accessibility.
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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