Computer Networks

Computer network is a system consisting of computer and other network devices that work together to achieve a common purpose. The purpose computer network are:

Dividing resources: for example the use of shared printers, CPU, memory, hard drive
Communication: eg electronic mail, instant messaging, chat
Access to information: for example web browsing

Based on the criteria, a computer network is divided into 4, namely:

1. Based on the distribution of sources of information / data

- Network This network consists of a centralized computer where the client and the server that the client computer that serves as an intermediary to access sources of information / data derived from a single computer server

2. Based on the geographic reach is divided into:

- Network LAN is a network that connects 2 computers or more in coverage such as laboratories, offices, and in 1 cafe.

- Network MAN network is covering a large city and its local area. Examples of local telephone networks, cellular telephone systems, as well as some ISP's internet relay network.

- WAN Network A network with worldwide coverage.

3. Based on data transmission media

- Wired Network (Wired Network) In this network, to connect one computer to another computer network cables required.

- Wireless Network (Wireless Network) is a network with the medium in the form of electromagnetic waves.

4. Based on the roles and relationships of each computer in the process data.

- Network Client-Server In this network there are 1 or more server computers and client computers. As an intermediary for the client computer can access data on a server computer and the server computer provides the information required by the client computer.

Networking-Peer-to-peer network does not exist at the client computer and server computer because all computers can do the transfer and receipt of information so that all computers function as clients as well as a server.

Source : www.wikipedia.com