Rackmount switch poe switch switching ports 52 10 gigabit ethernet ports 4x sfp gigabit ethernet ports 48 x rj 45 switch type standalone management managed layer 2 network standards energy efficient ethernet flow control link aggregation control protocol lacp link layer discovery protocol lldp spanning tree protocol stp vlan quality of services qos dhcp snooping address resolution protocol arp access control list acl broadcast storm control multicast