Rackmount switch poe switch switching ports 28 10 gigabit ethernet ports 2x sfp 2x rj 45 gigabit ethernet ports 24 x rj 45 switch type stackable management managed layer 3 network standards power over ethernet poe access control list acl quality of services qos multicast igmp snooping mld snooping link layer discovery protocol lldp energy efficient ethernet spanning tree protocol stp vlan link aggregation lag link aggregation control protocol lac