The Cisco 4331 Integrated Services Router (ISR 4331-SEC/K9) is a powerful and highly flexible networking device designed for enterprise environments that require high-performance routing, security, and voice services. Featuring a 1.8 GHz quad-core processor, it delivers up to 100 Mbps of throughput with security features enabled and up to 300 Mbps with WAN optimization.

With two Gigabit Ethernet (GE) ports for both WAN and LAN connectivity, along with two built-in network module (NM) slots for expansion, the Cisco 4331 provides versatile connectivity options. It supports a range of routing protocols like OSPF, EIGRP, BGP, and RIP, and offers comprehensive security capabilities including firewall, IPsec VPN, SSL VPN, intrusion prevention, and malware protection. It also includes advanced QoS for traffic prioritization and optimization, ensuring efficient network performance.

The router is highly scalable, offering redundancy features such as optional hot-swappable power supplies, redundant fans, and integrated high availability (HA). It's optimized for voice and unified communications with support for VoIP, video, and Cisco Unified Border Element (CUBE). For ease of management, the device supports Cisco Configuration Professional (CCP), CLI, and web-based management, making it a versatile choice for businesses looking to streamline network operations.

Designed for 1U rack-mounted installations, the Cisco 4331 offers robust performance, security, and scalability, making it ideal for medium to large-sized enterprises requiring a secure, reliable, and flexible network solution.