Floppy disks and CD-ROMs are very interesting media for people to share data or files. That was roughly in the 1990s. How to transmit data between computers with remote locations will be very difficult, but we really need and often transmit files or data. We are still dependent on the data storage medium.
As a result of problems with the difficulty of transmitting data between computers with each other, the concept of a network to combine two or more computers appears. Computer networks are formed by connecting 2 or more computers using a network cable that later in the plug in the computer port. Each computer has a network port that is used as the id of the computer. When inter computers can share files and data then the storage of mobile storage is not so needed anymore.
Computer networks consist of many types and uses. Talking about the network means we have to understand the concept of the network itself. The network can be in the form of region or local area only, depending on the needs and how often the data sharing needs are done, because in the network will involve some aspects of security.
First, computer networks are classified by geographic region. The classification in this case is the size of the network to be used. There are three classifications of computer networks, among others are LAN, WAN and MAN. LAN (Local Area Network) is the smallest network classification compared to others. LAN is a computer network that can include small rooms such as office space, factory, or can also be between adjacent buildings or offices. MAN (Metropolitan Area Network) covers the city even up to a country. While the WAN, the scope can be more extensive, can include countries, groups or some countries even to the world scale can be included in the WAN.
Second, the classification based on the distribution of data across the network and the behavior of the computers connected in the network. In this second network classification there are two types of networks that need to be known. First is the type of peer to peer network where computers within a network are treated equally all without distinction. Treated the same meaning, the speed of data access, processing and data storage there is no limit between one computer and another. There is no special treatment on any computer connected in the network.
The second type is the client-server type. Can be interpreted otherwise with peer to peer, meaning that every computer on this type of network have different access rights between computers one and other. In this network there is one computer that serves as SERVER, where this computer has the most complete treatment than other computers such as power in data processing and data storage has the largest capacity than others. A computer other than SERVER is called CLIENT. Normally CLIENT computers have lower specifications than SEVER. The CLIENT computer will always need data that is shared from the SERVER because this CLIENT computer has less memory and processor power.