DP-300 Implement a secure environment Practice Question
You are configuring Azure SQL Database firewall rules for a new application. The application runs on Azure VMs in the same region. To minimize latency and security risk, which approach should you use?
⚠ Common exam trap
Watch out — candidates often confuse 'allowing Azure services' (a broad, insecure setting) with the more secure virtual network service endpoint approach, or they mistakenly think adding individual VM public IPs is sufficient for security and latency.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Configure a virtual network service endpoint and a virtual network firewall rule.
Using a virtual network service endpoint and a virtual network firewall rule allows Azure SQL Database to accept traffic only from the specific subnet hosting the application VMs, without exposing the database to the public internet. This minimizes latency by keeping traffic within the Azure backbone network and reduces the security risk by eliminating broad IP-based rules.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Add a firewall rule allowing all Azure IP addresses.
Why it's wrong here
Allowing all Azure IP addresses admits traffic from every Azure tenant, not just your VMs, so it fails the security requirement. It is tempting because it removes connectivity friction, and it would be correct for a service needing broad access from many unrelated Azure deployments.
- ✓
Configure a virtual network service endpoint and a virtual network firewall rule.
Why this is correct
A virtual network service endpoint routes traffic to Azure SQL over the Microsoft backbone, keeping it off the public internet. The virtual network firewall rule then permits only that subnet, minimising both latency and exposure for same-region VMs.
- ✗
Add a firewall rule for each VM's public IP address.
Why it's wrong here
VM public IP addresses route traffic over the public internet rather than the Azure backbone, adding latency and exposing the database endpoint. It is tempting because it restricts access to known addresses, and it would be correct for clients outside Azure with static public IPs.
- ✗
Add a firewall rule allowing all Azure services to access the database.
Why it's wrong here
The all-Azure-services rule permits any Azure-hosted service, including other tenants', to reach the database, widening exposure beyond your VMs. It is tempting because it is quick to enable, and it would be correct for Azure platform services that cannot use a fixed outbound IP.
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Related to this question
Learn chapter
Deploying and Configuring SQL Server on Azure Virtual Machines
Key term
Azure SQL Performance Tuning
Azure SQL Performance Tuning is the process of optimizing the speed and efficiency of queries and database operations in Microsoft Azure SQL Database or SQL Managed Instance to reduce latency and improve throughput.
Key term
Azure SQL Firewall Rules
Azure SQL Firewall Rules are security settings that control which IP addresses or Azure services are allowed to connect to a SQL database hosted in Microsoft Azure.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This DP-300 practice question is part of Courseiva's free Microsoft certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the DP-300 exam.