Cisco 1721, SMDS, X.25, Frame Relay, ATM, Ethernet, OSPF, Ethernet, Fast Ethernet, RADIUS, TACACS+, CHAP, PAP, RISC, 16 MB
Cisco 1721. Protokol peralihan: SMDS, X.25, Frame Relay, ATM, Ethernet, Protokol penghalaan: OSPF, Protokol pepaut data: Ethernet, Fast Ethernet. Kaedah pengesahan: RADIUS, TACACS+, CHAP, PAP. Processor architecture: RISC, Memori kilat: 16 MB, Memori dalaman: 48 MB. Penunjuk LED: Kuasa. Keserasian: IEEE 802.3-LAN, IEEE 802.3U-LAN, IEEE 802.1Q, Keperluan kuasa: AC 100/240 V ( 50/60 Hz ), Kadar pindahan data maksimum: 0,1 Gbit/s