Basic of Networking

Netowrk 

In computer Science network is a set of computers connected together for the purpose of sharing resources. The most common resource shared today is connection to the Internet. Other shared resources can include a printer or a file server.

A network Computers  can be connected through twisted pair cables, telephone lines, radio waves, satellites or optical fiber cables. The first computer network was designed by ‘Advanced Research Projects Agency Network (ARPANET)’ in the United States Department of Defense. There are three type of network technologies.

LAN: Local Area Network

A Local Area Network (LAN) is a network that is bound to a smaller physical areas like a university, house or a small office. Approximately all current LANs whether wired or wireless are based on Ethernet. On a ‘Local Area Network’ data transfer speeds are higher than WAN and MAN that can extend to a 10.0 Mbps (Ethernet network) and 1.0 Gbps (Gigabit Ethernet).

MAN:Metropolitan Area Network

We can take Bank network as a example of Metropolitan Area Network where all branches located in different districts are interconnected through head office by using fiber optic cables. In one sentense A Metropolitan Area Network (MAN) is a network that connects two or more computers, communicating devices or networks in a single network that has geographic area larger than that covered by even a large ‘Local Area Network’ but smaller than the region covered by a ‘Wide Area Network’.

WAN:Wide Area Network 

Internet is a perfect exaple of WAN. Wide Area Network is a computer network that covers relatively larger geographical area such as a state or country. It provides a solution to companies or organizations operating from distant geographical locations who want to communicate with each other for sharing and managing central data or for general communication.

WAN is made up of two or more Local Area Networks (LANs) or Metropolitan Area Networks (MANs) that are interconnected with each other, thus users and computers in one location can communicate with users and computers in other locations.


Basic IT Questions for exam