The Cisco FPR2120-NGFW-K9 is a 1-Rack-Unit (1RU) Next-Generation Firewall (NGFW) appliance from the Firepower 2100 Series, running the Firepower Threat Defense (FTD) software. It is designed for mid-sized enterprise and branch office deployments, providing comprehensive threat protection including application visibility and control (AVC), intrusion prevention (IPS), and advanced malware protection .