Poe switch rackmount switch switching ports 24 gigabit ethernet ports 24 x rj 45 4 x sfp switch type standalone management managed layer 2 network standards power over ethernet poe power over ethernet poe access control list acl igmp snooping quality of services qos dhcp snooping vlan address resolution protocol arp link aggregation control protocol lacp spanning tree protocol stp weighted round robin wrr loop detection flow control broadcast st