ASHIMA KALRA

 COMPUTER NETWORK  Local Area Network (LAN) Local Area Network (LAN)  Metropolitan Area Network(MAN) Metropolitan Area Network(MAN)  Wide Area Network (WAN) Wide Area Network (WAN)

 Computer network, often simply referred to as a network, is a collection of hardware components and computers interconnected by communication channels that allow sharing of resources and information.  System of computers, print devices, and computer software linked by communications cabling or radio waves

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 Local area networks  Metropolitan area networks  Wide area networks BACK

 Local area network (LAN) is a network that connects computers and devices in a limited geographical area such as home, school, computer laboratory, office building, or closely positioned group of buildings.  Series of interconnected computers, printing devices, and other computer equipment that share hardware and software resources BACK

 Limited geographic limits  Limited number of users  Reliability and stability  Flexibility  Expendable  Security and administration BACK

 In expensive transmission media  In expensive devices to interface the media  Easy physical connection of devices to the media  High data transmission rates  High degree of inter-connection between devices BACK

 Local area networking software requires memory space in each of the computers used on the network  Adds another level of complexity to the computer operation  Security system must be implemented  Financial cost of networking is high in comparison with many other alternatives BACK

 Metropolitan area network (MAN) is a large computer network that usually spans a city or a large campus.  Links multiple LANs in a large city or metropolitan region BACK

 Wide area network (WAN) is a computer network that covers a large geographic area such as a city, country using a communications channel that combines many types of media such as telephone lines, cables, and air waves. A WAN often uses transmission facilities provided by common carriers, such as telephone companies.  Far-reaching system of networks that usually extends over 30 miles and often reaches across states and countries BACK

Example of a WAN

 Data Transmission speed is low.  Data Transmission cost is very high.  Data transmission error can occur.  More complexity.  Less reliable.  The communication medium used can be satellites links due to longer distances involved. BACK

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