Cisco 2921 integrated services router offers three Gigabit Ethernet ports, four EHWIC slots, 512 MB RAM, 256 MB flash, and a PVDM332 UC/SEC license pack for IOS firewall, BGP, OSPF, EIGRP, IPv6, MPLS. It runs on AC 100‑240 V, consumes 60 W, fits a 2U rack, and operates from 0–40 °C with 10–85 % humidity.