Protect the Application Where It Resides. The increasing sophistication, frequency, and diversity of today’s network attacks are overwhelming conventional stateful security devices at the edge of the data center. The F5 Application Delivery Firewall (ADF) solution is a modern threat mitigation platform that provides complete protection from the bottom to the top of the network stack. A convergence of highly scalable security products and services, ADF architectures are ideal for protecting Internet-facing data-center-applications, wherever they reside.