Cisco ISR4321-V/K9 Integrated Services Router

The Cisco ISR4321-V/K9 Integrated Services Router provides secure WAN routing with integrated voice and data services for enterprise branch networks. With a rack-mountable form factor, it offers 2 × integrated Gigabit Ethernet WAN ports and 2 × LAN ports, up to 100 Mbps throughput by default (upgradeable via licenses), and includes a Unified Communications license for voice services. It features 4 GB DRAM (expandable), 4 GB internal flash, 2 × NIM slots for expansion, a PVDM4-32 DSP module, and a USB 2.0 port, plus console and auxiliary management interfaces. Security features include an integrated firewall, IPSec VPN, and encryption acceleration, and the model (MPN ISR4321-V/K9) is commonly paired with ISR4331-V/K9, ISR4321/K9, or C1111-8P as viable replacements.