Quick overview from the supplier:
TP-LINK TL-SG3428 24-port Pure-Gigabit L2 Managed Switch, 24 10/100/1000Mbps LAN ports including 4 Gigabit SFP slots, 1 consol port RJ-45, 1 consol port MicroUSB, GVRP, STP/RSTP/MSTP, IGMP V1/V2/V3 Snooping, L2/L3/L4Traffic Classification
