Cisco ISR4221-SEC/K9 Integrated Services Router

The Cisco ISR4221-SEC/K9 Integrated Services Router is a secure WAN routing solution in the Cisco ISR 4000 Series, designed for enterprise branch networks such as branch offices, remote sites, and small campuses that require reliable gigabit performance with integrated security. It offers 2 x 10/100/1000 Gigabit Ethernet ports, Modular WAN interface support, and Network Interface Module expansion slots, plus USB ports for storage or configuration tasks. Security features include integrated VPN and firewall services to protect distributed networks, with throughput up to 35–75 Mbps depending on license, enabling secure VPN, application visibility, and traffic management. Management is via CLI, web interface, and SNMP, and the unit is rack-mountable for standard equipment deployments. Common replacements in this family include ISR4321/K9, ISR4331/K9, and ISR4221/K9, underscoring its role in scalable, secure branch connectivity for enterprise campuses, financial institutions, retail locations, and government networks.