Cisco 4321 Integrated Service Router, ISR4321/K9

The Cisco ISR4321/K9 Integrated Services Router is a powerful and flexible networking solution designed for small to medium-sized branch offices and businesses. Part of Cisco’s 4300 Series, this router combines high performance, security, and advanced services in a compact form factor.

With its multi-core processor and 4 GB of RAM, the ISR4321 offers exceptional performance for routing, security, and application services, making it ideal for organizations requiring high throughput, reliability, and scalability. It supports 2 Gigabit Ethernet WAN ports for flexible external connectivity and 3 Gigabit Ethernet LAN ports for internal network connections, providing the foundation for robust communication and data transfer.

The ISR4321 is highly modular, featuring 2 EHWIC slots, 2 ISM slots, and a NIM slot, allowing businesses to expand and adapt the router to meet future needs, whether for additional WAN interfaces, security features, or voice services. Its support for VPNs, stateful firewalls, Intrusion Prevention Systems (IPS), and Access Control Lists (ACLs) ensures a secure and resilient network environment.

This router is also VoIP-ready, offering integration with Cisco Unified Communications and delivering high-quality voice and video services. The built-in Quality of Service (QoS) ensures that real-time applications such as voice and video are prioritized, minimizing latency and ensuring high performance.

Whether used for secure internet access, site-to-site VPNs, or unified communications, the Cisco ISR4321 provides the flexibility, performance, and security needed to support modern business applications. Additionally, with features such as IPv4/IPv6 routing, dynamic and static routing protocols, and WAN optimization, this router is an ideal choice for businesses looking to improve their network infrastructure while maintaining future-proof capabilities.