Poe switch desktop switch switching ports 8 gigabit ethernet ports 8 x rj 45 2 x sfp switch type standalone management managed layer 2 network standards quality of services qos igmp snooping power over ethernet poe access control list acl link aggregation lag spanning tree protocol stp vlan link aggregation control protocol lacp power over ethernet poe port mirroring dhcp snooping link layer discovery protocol lldp backplane bandwidth 20 gbs