This document discusses Azure network security features for securing the cloud perimeter and implementing a zero trust architecture. It covers Azure Virtual WAN for connecting and segmenting networks, Azure Firewall for security policy enforcement across distributed networks, and Azure Private Link for private connectivity to PaaS resources without an internet accessible IP address. Other relevant security services mentioned include Azure Web Application Firewall, Azure Bastion for secure RDP/SSH access without a public IP, and Azure DDoS Protection.