A Gigabit Ethernet network transmitting at 10 Mbps, 100 Mbps and 1 Gbps. Very old computers are limited to 10 Mbps, and most computers support 10/100 or 10/100/1000 speeds. See Ethernet
and Ethernet adapter
"Twisted Pair" Ethernet
All stations in 10/100/1000 Ethernet networks are wired to a central switch using twisted pair wires and RJ-45 connectors.