Cisco ISR4351-SEC/K9 Router for Secure Enterprise Networks

What It Is

The Cisco ISR4351-SEC/K9 is a modular enterprise edge router from the Cisco ISR 4000 series, delivered as a security bundle with an embedded SEC license. This model is designed for medium-to-large branch offices and campus deployments, providing integrated routing, security, and WAN connectivity in a compact 2RU form factor. The SEC license enables advanced security features such as VPN, firewall, and threat protection without requiring additional hardware modules.

Technical Details

• Platform: Cisco ISR 4351 (part of ISR 4000 series)
• Bundle Type: SEC bundle with pre-installed SEC license
• MPN: ISR4351-SEC/K9
• Form Factor: Rack-mountable router for enterprise edge
• Integrated Services: Routing, security, and WAN optimization in one chassis
• Licensing: SEC license included (no separate purchase required)
• Series Compatibility: Operates within the Cisco ISR 4000 family, sharing common feature sets and management tools

Configuration & Options

• Chassis: ISR 4351 base unit with modular slots for network interface modules (NIMs) and service modules
• Security License: SEC license pre-activated, covering VPN, firewall, and content security features
• Software: Ships with Cisco IOS XE software (default IP base or equivalent, per platform standard)
• Expansion: Supports additional NIMs and SM-X modules for WAN interfaces (e.g., T1/E1, DSL, SFP) and services (e.g., voice, compute)

Operating Conditions

This router is deployed as a WAN aggregation point or primary gateway in branch offices, regional headquarters, or campus networks requiring integrated security and routing. It operates in controlled indoor environments (standard enterprise racks, telecom rooms, or data closets) with typical temperature and humidity ranges for IT equipment. Suitable for 24/7 continuous operation in medium-to-high throughput environments, supporting concurrent VPN tunnels, firewall inspection, and inter-VLAN routing.