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Wired networks are capable of transferring data at a (maximum) speed of 10Mbps (Megabits per second), 100Mbps, and the new Gigabit networks operating at a maximum 1000Mbps.
A NIC or Network Interface Card is required in a computer to enable it to communicate to other network devices. Most motherboards do have network capabilities built onto them and a NIC is not required.
A Hub is an electronic box that allows you to connect the different systems on a network to each other by using networking cables. It is possible to connect two computers to each other without the need for a hub by using a cross-over cable.