Cisco ISR4331/K9 4331 Integrated Services Router

The Cisco ISR4331/K9 is part of the Cisco 4000 Series Integrated Services Routers (ISR), engineered to deliver secure, high-performance, and intelligent network services for branch offices and growing enterprises. Featuring a modular architecture, it supports a wide range of WAN interfaces, integrated security, and advanced application optimization.

With performance up to 100 Mbps (upgradeable to 300 Mbps), the ISR4331/K9 provides the agility and scalability modern businesses need. It seamlessly integrates routing, security, voice, and application services into a single platform — reducing hardware costs while simplifying network management.

Key Features

• 3 × Integrated WAN or LAN 10/100/1000 ports for flexible deployment

• Modular architecture supporting various interface modules and expansion cards

• Upgradable performance license (from 100 Mbps to 300 Mbps throughput)

• Built-in security features including firewall, VPN, and encryption

• Application Visibility and Control (AVC) for network performance monitoring

• Cisco Unified Communications support for integrated voice and collaboration

• Dual power supply options for redundancy and reliability

• Compact 1RU form factor for efficient rack space utilization

Benefits

• Secure and reliable connectivity: Protects data and ensures business continuity with integrated VPN and firewall features.

• Future-ready scalability: Modular design allows for easy upgrades as network needs grow.

• Simplified branch operations: Combines multiple services — routing, voice, and security — into one device.

• Enhanced visibility: Application monitoring tools provide insights into bandwidth usage and traffic patterns.

• Optimized performance: Intelligent traffic routing improves speed and reduces latency across WAN links.

• Energy-efficient and cost-effective: Designed for long-term use with reduced power consumption and maintenance costs.

Technical Specifications