Ethernet cards are essential parts of a network. They connect a computer to another computer or to a server by using a cable, an alternative to a wireless network.

Ethernet Network – The Role of Ethernet in Computer Networks
An ethernet network is a situation in which multiple computers are connected to one another and share the same Internet protocol address.

An ethernet network has multiple computers on the same server. The benefit in this is that multiple networks do not need to be created.
The downside to an ethernet network is that the connection of multiple computers leaves each computer open to hacking, malware, and viruses — in the event that a virus should attack one computer on the system.
There are certain components necessary for an ethernet network: * Ethernet cable * Ethernet hub * Crossover cable * Router
Ethernet Cable
An ethernet cable is a necessary cord to connect two or more computers to the same network. Each computer must have its own ethernet cable in order to operate on the same ethernet network.
Ethernet Hub
An ethernet hub is a device used to string together each ethernet cable, which connects each computer on the same network. An ethernet hub contains several ethernet ports.
Crossover Cable
A crossover cable is a substitute for ethernet cables when one wants to connect two or more computers to the same ethernet network.
Router
A router is similar to an ethernet cable in that it connects two or more devices. Routers are more often used for local area networks that are small in size. Businesses and universities, for example, often use ethernet cables to connect computers. Small schools or elementary and middle schools (including high schools) use routers.
WANs, or wide area networks, require ethernet cables instead of routers — since routers can only work in circumstances of short distances. Certain ethernet networks require