The Cisco ISR4351-SEC/K9 is a powerful and secure enterprise-class router from the Cisco 4000 Series Integrated Services Routers (ISR) family, engineered to deliver high-performance networking, advanced security, and flexible connectivity for medium to large branch offices and enterprise edge deployments. Designed to support modern business applications, this router provides reliable performance, scalability, and integrated services within a single platform.
With up to 400Mbps throughput, the ISR4351-SEC/K9 ensures smooth and stable network performance for bandwidth-intensive applications such as cloud computing, video conferencing, VoIP communications, secure VPN connections, and large data transfers. Its optimized architecture allows multiple services to operate simultaneously without compromising speed or reliability, making it ideal for growing enterprise environments.
The router features 3 WAN/LAN Gigabit Ethernet ports, offering flexible configuration options for primary and backup internet links, load balancing, and network segmentation. These ports help organizations maintain high availability and improve network resilience by enabling redundant connectivity.
Additionally, the ISR4351-SEC/K9 includes 3 SFP (Small Form-factor Pluggable) ports, allowing fiber-optic connectivity for high-speed data transmission and long-distance networking. This capability enables seamless integration with enterprise fiber infrastructure, ensuring scalability and improved performance across distributed business locations.
Security is a core feature of this model. The SEC (Security) license provides advanced protection through integrated firewall services, secure VPN connectivity, intrusion prevention capabilities, and network segmentation. These features safeguard sensitive business data, secure remote access, and help organizations comply with modern cybersecurity standards. Cisco’s trusted security architecture ensures continuous protection against evolving threats.
Powered by Cisco IOS XE software, the ISR4351-SEC/K9 offers advanced network management, automation, and programmability. IT administrators benefit from centralized control, application visibility, and performance monitoring tools that simplify network operations. Built-in Quality of Service (QoS) prioritizes mission-critical traffic such as voice and video, ensuring consistent performance even during heavy network usage.
The router’s modular and rack-mountable design allows easy expansion with additional service modules or interfaces, making it a future-ready solution for expanding enterprise networks. Its durable enterprise-grade hardware ensures long-term reliability and stable operation in demanding business environments.
Whether deployed at a branch office, enterprise edge, or corporate infrastructure environment, the Cisco ISR4351-SEC/K9 delivers secure, scalable, and high-performance routing designed to meet modern enterprise networking requirements.
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