Work stations connected to a switch whats then connected to a server, the server gives a service to the nodes/workstations that are connected to the server. Some of these services are file servers, back ups, printing, email, access to the internet. When the node authenticates his access in the network it will go through the switch then through the cable and in the server where they can access all these services available. Then the server will figure out what services they are aloud to access and then give them, them services. Back up servers in client servers are very easy to get and use, a back up is to save all folders in the file server and stored off site away from the server.