Microsoft Certified: Azure Fundamentals (AZ-900) Practice Exam

All the listed options represent Azure services designed to enhance network security, making "all of the above" the correct answer.

Virtual network security involves measures and tools offered by Azure to protect your virtual networks, including network segmentation, private networks, and the configuration of security policies. It ensures that traffic between resources within your virtual network is secure.

Azure Application Gateway acts as a web traffic load balancer and includes a built-in web application firewall (WAF) service. This helps protect your web applications from common threats and vulnerabilities, securing HTTP traffic.

Azure Firewall is a cloud-native network security service that protects Azure Virtual Network resources. It provides a centralized, highly available network protection layer to manage and enforce settings, as well as application-level protections.

Since each of these components plays an essential role in securing your Azure network environments, consolidating them under the umbrella of network security services reinforces the comprehensive nature of Azure's offerings in this area.