D-Link DGS-3120-24TC/SI 24-port L2 Stackable Managed Gigabit Switch, standard image, 20x gigabit, 4x gigabit/SFP

24-port 10/100/1000 Layer 2 Stackable Managed Gigabit Switch including 4-port Combo 1000BaseT/SFP with Standard Image - Managed Gigabit Ethernet Switch - 24 x 10/100/1000Mbps Auto-Negotiating Ports * Including 4 Combo 1000BaseT/Mini-GBIC SFP ports - 2 dedicated stacking ports for full-duplex 40Gbps stacking (up to 6 units/stack) - IEEE 802.1D/1w/1s Spanning Tree Protocol, 802.3ad Link Aggregation - LBD, Port Mirroring - IGMP/MLD Snooping - 802.1Q, Voice VLAN, Asymmetric VLAN, GVRP, Port/MAC-based VLAN - 802.1p, Bandwidth Control - ACL, Time-based ACL - SSH/SSL, Traffic Segmentation, ARP Spoofing Prevention, DHCP Server Screening, BPDU Attack Protection - Port/Host Based 802.1X, Identity-driven security policy assignment, Port/Host Based WAC/MAC, Microsoft NAP Support - SNMP, RMON v1/v2, DHCP Auto-configuration, Flash file system, LLDP, DHCP Relay, Multiple images/configuration - 1U height, 19" Rackmount Installation.