The correct answer is to add a firewall rule for the App Service's outbound IP address range. This works because Azure App Service with a dynamic outbound IP address uses a set of possible addresses that can change over time, and Azure SQL Database firewall rules must specify static IP ranges to allow traffic. By configuring the firewall with the full outbound IP address range—available in the App Service properties or via the `WEBSITE_OUTBOUND_IP_ADDRESSES` app setting—you ensure the application can connect even as its specific outbound IP shifts, while blocking all other traffic. On the DP-300 exam, this scenario tests your understanding of network access controls for PaaS services, often appearing as a trap where candidates mistakenly choose VNet integration or private endpoints, which are overkill for simple IP-based restrictions. Remember the memory tip: “Dynamic IPs need a range, not a single change”—always look for the full address list when dealing with App Service’s variable outbound traffic.
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.
Your company uses Azure SQL Database for a customer-facing application. You need to ensure that only the application can access the database, and that access is restricted to specific IP ranges. The application runs on Azure App Service with a dynamic outbound IP address. What should you do?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Add a firewall rule for the App Service's outbound IP address range.
Option D is correct because the application runs on Azure App Service with a dynamic outbound IP address, and the requirement is to restrict access to specific IP ranges. By adding a firewall rule for the App Service's outbound IP address range (which can be found in the App Service properties or via the `WEBSITE_OUTBOUND_IP_ADDRESSES` app setting), you allow the application to connect to Azure SQL Database while blocking other traffic. This approach directly addresses the dynamic IP challenge without requiring VNet integration or private endpoints.
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.
✗
Configure a VNet integration for the App Service and set the SQL firewall to allow the VNet subnet.
Why it's wrong here
VNet integration requires Premium App Service plan and does not directly provide outbound IP control.
✗
Migrate the database to Azure SQL Managed Instance and use a service endpoint.
Why it's wrong here
Managed Instance is more complex and costly; not needed for this scenario.
✗
Create a private endpoint for the SQL Database and connect App Service to it via VNet peering.
Why it's wrong here
Private endpoint restricts access to the VNet, but App Service without VNet integration cannot use it natively.
✓
Add a firewall rule for the App Service's outbound IP address range.
Why this is correct
This allows App Service to connect even with dynamic IPs, as the range is known.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often assume VNet integration or private endpoints are always required for secure access, but the question explicitly states the application uses a dynamic outbound IP address, making a firewall rule for the IP range the most straightforward solution that meets the requirement of restricting access to specific IP ranges.
Trap categories for this question
Scenario analysis trap
Managed Instance is more complex and costly; not needed for this scenario.
Detailed technical explanation
How to think about this question
Azure App Service with dynamic outbound IPs uses a range of IP addresses that can change over time, but the full range is documented in the `possibleOutboundIpAddresses` property. When configuring SQL Database firewall rules, you can add the entire range (e.g., 40.83.0.0/16) to ensure connectivity even if the specific IP changes. This approach is simpler than VNet integration or private endpoints, which require additional networking components and may introduce latency or complexity for a simple IP-based access control requirement.
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: Add a firewall rule for the App Service's outbound IP address range. — Option D is correct because the application runs on Azure App Service with a dynamic outbound IP address, and the requirement is to restrict access to specific IP ranges. By adding a firewall rule for the App Service's outbound IP address range (which can be found in the App Service properties or via the `WEBSITE_OUTBOUND_IP_ADDRESSES` app setting), you allow the application to connect to Azure SQL Database while blocking other traffic. This approach directly addresses the dynamic IP challenge without requiring VNet integration or private endpoints.
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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