Senin, 15 November 2010

Computer Networking Fundamentals

A computer network is a set of two or more computers in communication with one another through a medium. The media can be, etc., by radio waves, infrared fiber cable, optical the network is an integral part of our daily lives, the main reason is that of communication. The use of computer networks to share resources like fax machines, printers, files, etc., and other uses of the database server, server, email, chat, internet, etc. The computing resources are connected, called servers and other computers access to the resource are called clients. In peer-to-peer computer network, no server.

The sharing of fax machines, printers and modems used by many computers and users reduce operating costs. A database on a computer network is a very important question as it manages and saves a lot of important data and jobs. E-mail and instant messaging can be used for instantaneous communication and transfer files on a computer network.

Computer networks are classified by size, such as local area networks (LAN), Wide Area Networks (WAN), metropolitan area networks (MAN) and Personal Area Network (PAN). The topology (topology is the way of computer and network resources are connected), networks can be classified as a bus network, the network of ring and star network.

The network hardware consists mainly of cables, network cards and a hub. PC cards, so that a computer can understand what "speaks" the other team needs. The network cards have unique MAC address to identify computers on a network. Hub to connect all the computers on the network. Hubs can also be used to connect to other centers with the size of the computer network to increase. Two teams can be available within a price of $ 100 in network cards or telephone lines or power lines to communicate with the hardware kit.

If the number of computers in an office or home, increasing the number of wires, wireless networks a practical solution. In wireless networks, transmission of radio receivers, or infrared signals used for communication between computers and devices. Examples of wireless networks Wi-Fi and Bluetooth technology, or who may be involved in security issues of wireless networks. However, there is certainly a strong preference among consumers in wireless networks today.

Computer networks are a new dimension included the 21 st century. Today, the cyber-world is much faster and wider than the real world. All this is possible through the computer. Computer networks have revolutionized business, communication, travel, research, defense, society, and almost all human activities. The development of information networks has contributed to the technological revolution, a great leap forward.

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