| Suppose two persons that have data stored on | | | | anther floor by means of the network. The same |
| some media, say hard drives. If the two persons | | | | is true for CD-ROM. This must be configured on |
| need to share this data with each other, what will | | | | both computers by the operating system. This |
| they do? | | | | benefit of networking makes it helpful for people |
| This question is the basis on which the networking | | | | to use remote devices on their office. Also it |
| principle is built. The two persons can send the | | | | reduced the cost because on printer or one |
| data to each other by copying it to movable drive | | | | CD-ROM is used for all members of the network. |
| say flash memory and giving it to each other. | | | | Mainly the network will be composed of a set of |
| This can be well if it will not be happening | | | | computers and a printer. This set of computers |
| continuously. But what if the two persons need to | | | | will be responsible for sending the data to each |
| send data every day or even every hour? It will | | | | other. One computer also may use the printer to |
| be difficult to send it to each other especially if | | | | print documents. If the network looked like this, it |
| they remote from each other. | | | | will be called peer to peer. In this scheme, all |
| The idea of networking has been arisen from | | | | computers are the same and have equal |
| such cases. Instead of sending data between two | | | | processing power. The information is also |
| or more people on movable devices such as | | | | distributed across them equally. There is no device |
| floppy disks, they can easily connect their | | | | that has more data in its hard drive. |
| computers to each other. Every person who | | | | On the other hand, if there is at least one |
| wants to transfer the data to his friend can easily | | | | computer in the network that has more stored |
| transfer it through the network. | | | | data and more processing power and speed, then |
| So how will the data be transferred across the | | | | the scheme will be called server-based networking. |
| network? Simply by connecting computers of | | | | The computer that has the more data storage |
| different persons to each other by means of | | | | and the higher processing power will be called the |
| cables the data can be easily transmitted. Thus | | | | server. This scheme can be defined also as a |
| the media will be cables rather than movable | | | | client-server based model because the other |
| devices although it can be also wireless device. | | | | computers in the network that have normal |
| The wireless device will send the data in air by | | | | processing power will b treated as clients that will |
| electromagnetic waves. It will be electrical pulses if | | | | request data from the server. The internet is build |
| the data are transmitted on cables. | | | | over this scheme where the home computers |
| In fact networks can be used not only to share | | | | are the clients and the computers that serve |
| data but also to share devices such as printers | | | | them are called servers. The most popular server |
| and CD-ROM. One user on a floor can use a | | | | type is the web server which forwards page to |
| printer that is connected to another computer on | | | | the clients in the home or offices. |