Cisco 2921. Piawaian rangkaian: IEEE 802.1Q, IEEE 802.1ag, IEEE 802.3, IEEE 802.3ab, IEEE 802.3af, IEEE 802.3ah, IEEE 802.3u, Jenis antara muka ethernet: Ethernet gigabit, Teknologi perkabelan: 10/100/1000Base-T(X). Protokol penghalaan: BGP, EIGRP, OSPF, Protokol pengurusan: CBWFQ, WRED, PBR, PfR, NBAR, SOAP, EEM, PSLA, SNMP, RMON, Syslog, NetFlow, TR-069, LMS, GOLD, NCM, Protokol yang disokong: IPv4, IPv6, IS-IS, IGMPv3, PIM SM, SSM, DVMRP, IPSec, GRE, BVD, MPLS, L2TPv3, PPP, MLPPP, MLFR,.... Keselamatan tembok api: Cisco IOS. Memori kilat: 256 MB, Memori dalaman: 512 MB, Keselamatan: UL 60950-1, CAN/CSA C22.2 No. 60950-1, EN 60950-1, AS/NZS 60950-1, IEC 60950-1. Product color: Hitam, Kapasiti rak: 2U