History of the development of computer networks
Computer network is a system for connecting two or more using one of the techniques of
communication systems for the exchange of information and resources, including the data available to the network, such as the typewriter or applied programs of any kind, as well as allow direct communication between users. In general, the study of computer networks is considered one of the branches of science communication. It is possible that the computers in the network are very close to each other and so like to be in one room and called the network in this case a LAN. It is possible that composed the network be set devices in distant places such as networks between cities or countries and even continents are connected such networks often to the Internet or satellite (Satellite) and the network called then Wide area network WAN, there is also the return of personal network PAN and the devices that connect a group close to the user.
Date of networks:
Internet has evolved as a result of research began in the early sixties when I decided Pentagon entry linking the main computer and then the Ministry of Defence to communicate with each other; and to the formation of several centers network.
They fit any network itself, and the network that is designed, known as ARPANET) A dvanced Research Project Agency Net). In the eighties took the National Science Foundation (NSF US) National Science Foundation expanded program to link the central supercomputers with the ARPANET, and began to universities and other centers of research in the world to join the network in 1991 originated the World Wide Web (www), Tim Berners-Lee developed a code (www ) World Wide Web (World Wide Web). then in 1993, he was a charter Internet community (ISOC), the number of hosts (users) 1,000,000 Internet and in 1994 the emergence of Netscape Navigator program.
1996 Tjoaz number of hosts (users) ten million Internet, the web covered ball Alerdah.mn late nineties of the twentieth century, and yet doubles the number of Internet users every six months exceeded the number of hosts (users) Internet 110 Mleon.fa 2001
Private network features: the work of a computer network must meet the following requirements:
Broker "is a wire or wireless transmission media.
Maaúm to connect those arguments to the network.
Dividing networks:
Networks are divided into several sections depending on the network to:
Broad network or WAN networks using remote local area networks such as the Internet is used to haul the nearest such networks that are used in universities distances. Local Area Network LAN covers this type of networks are usually small geographic areas, such as universities or branches of a large corporate computer network or in a house. The number of computers in this type ranges of at least two to 500 and to link these devices need to arrest a device called a hub or switch, switch position or any carrier that connects devices together and enable them to communicate with each other.
Used to connect devices usually in this kind of networks of wires, a special type of data transfer or hardware Allaslkih.eetmkn caller in the network of vision and files the information on other devices that allowed him Bzlk.istkhaddm this type usually in small enterprises and universities in order to facilitate the work and the transfer of information shared between departments quickly.
Several methods are available to connect the computer network, including the contract:
1 hybrid mesh networks connecting method:
2 interfaces stellar star networks method:
3 interfaces linear way bus networks:
4 way link tree tree networks:
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