The correct choice is to enable the public endpoint and create a firewall rule allowing only the on-premises static IP address. This configuration is most secure because Azure SQL Managed Instance’s public endpoint firewall evaluates source IPs against allowed rules before any connection is established, effectively blocking all public traffic except the trusted static IP from your on-premises network. On the DP-300 exam, this scenario tests your understanding of network security controls for managed instances, often appearing as a trap where candidates mistakenly suggest a private endpoint or VPN—both of which are unnecessary when a single static IP needs access. Remember that the public endpoint firewall is a simple, built-in layer of defense that does not require additional infrastructure. A useful memory tip: “One IP, one rule—public endpoint is the tool.”
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.
Your Azure SQL Managed Instance stores sensitive healthcare data. You need to restrict access to the database from public networks while allowing a specific on-premises application to connect. The on-premises network has a static public IP address. What is the most secure way to configure connectivity?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Enable the public endpoint and create a firewall rule allowing only the on-premises static IP address
Enabling the public endpoint with a firewall rule that restricts access to only the on-premises static IP address is the most secure way to allow a specific external application to connect while blocking all other public traffic. This approach leverages Azure SQL Managed Instance's built-in public endpoint firewall, which evaluates source IP addresses against configured rules before allowing connections, ensuring that only the trusted on-premises application can reach the sensitive healthcare data.
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 public endpoint without any firewall rules
Why it's wrong here
This would allow any public IP to attempt connections.
✓
Enable the public endpoint and create a firewall rule allowing only the on-premises static IP address
Why this is correct
This allows secure access from the specific on-premises IP while blocking all other public traffic.
Related concept
Read the scenario before looking for a memorised answer.
✗
Configure a service endpoint on the VNet where the Managed Instance is deployed
Why it's wrong here
Service endpoints connect Azure VNets to Azure services, not on-premises networks.
✗
Disable the public endpoint and configure a point-to-site VPN for the on-premises application
Why it's wrong here
This is overly complex and not necessary for a single static IP.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse Azure SQL Managed Instance's public endpoint firewall with Azure SQL Database's firewall, or incorrectly assume that service endpoints or VPNs are always more secure than a simple IP-based firewall rule, when in fact a properly configured firewall rule with a static IP is the most secure and efficient solution for this specific scenario.
Detailed technical explanation
How to think about this question
Azure SQL Managed Instance's public endpoint uses a layer-4 firewall that inspects the source IP address of each TCP connection attempt on port 3342 (default for public endpoint). The firewall rules are stored in the `sys.firewall_rules` system view and are evaluated in order; if no rule matches, the connection is dropped. In a real-world scenario, combining this with Azure Private Link for internal traffic and a public endpoint firewall for the specific on-premises static IP provides a defense-in-depth approach, ensuring that even if the firewall rule is misconfigured, the data remains protected.
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 public endpoint and create a firewall rule allowing only the on-premises static IP address — Enabling the public endpoint with a firewall rule that restricts access to only the on-premises static IP address is the most secure way to allow a specific external application to connect while blocking all other public traffic. This approach leverages Azure SQL Managed Instance's built-in public endpoint firewall, which evaluates source IP addresses against configured rules before allowing connections, ensuring that only the trusted on-premises application can reach the sensitive healthcare data.
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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