The Cisco ISR4321/K9 is an Integrated Services Router designed for small to medium-sized branch offices. It offers a balance of performance and services, including security, voice, and WAN optimization. It has a default throughput of 50 Mbps, which can be upgraded to 100 Mbps. It supports multiple WAN/LAN ports, including Gigabit Ethernet and SFP, and Network Interface Modules (NIMs) for expansion.
