24-port 10/100/1000 Gigabit Smart Switch including 4 Combo 1000BaseT/SFP * 20 x 10/100/1000Mbps Auto-Negotiating Ports * 4 x Combo 1000BaseT/Mini-GBIC SFP ports * Advance power saving features * Fanless design * Half-/Full-Duplex, auto-negotiation, Auto MDI/MDIX * IEEE 802.3x Flow Control * 802.3ad Link Aggregation * Asymmetric VLAN, Auto Voice VLAN * 802.1p priority queues * MAC/IP filtering * MAC/IP-based ACL * 802.1X port-base Access Control, Port Security * D-Link Safequare Engine * Smart Console Utility, web based management, compact CLI * D-View 6.0 support * 19" Rackmount Installation