Cisco ISR4451-X-SEC/K9 Integrated Services Router

The Cisco ISR4451-X-SEC/K9 Integrated Services Router Security Bundle is a Cisco ISR 4000 Series device engineered for enterprise branch and edge networks, delivering up to 1–2 Gbps of throughput (license dependent) with integrated VPN, firewall, and advanced security services to protect and route traffic between headquarters, remote sites, and cloud services. It supports modular WAN connectivity via NIM slots and service modules, provides 4 Gigabit Ethernet LAN ports, and offers expansion options for additional interfaces, enabling flexible deployment in corporate offices, financial institutions, healthcare networks, government facilities, and other large distributed environments. Powered by a multi-core CPU with 4 GB of DRAM (expandable) and 8 GB of internal flash, this rack-mount router is designed for secure, high-performance operation in demanding networks, with a form factor suited to enterprise rack installations. Common replacements include Cisco ISR4431/K9, Cisco ISR4451-X/K9, and Cisco C3945E-VSEC/K9.