Communication Tools

Communication Tools

How the radio functional

TYPES OF NETWORK

Network A network consists of two or more computers that are linked in order to share resources (such as printers and CD-ROMs), exchange files, or allow electronic communications. The computers on a network may be linked through cables, telephone lines, radio waves, satellites, or infrared light beams.

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Network Network are usually classified as a LAN, MAN and WAN. The main differentiation among these classification is their area of coverage. The differentiation among the network scheme is involve the orientation and the distance.

LAN LAN- local area network is a network Developed in 1970s. connects computers and devices in a limited geographical area such as a home, school computer laboratory, office building or closely positioned group of buildings.

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LAN Each computer or device on the network called a node, often shares resources such as printers, large hard disk and programs. It have server file which contains programming and data which will used by message. It also contains all software which control the management of network system.

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LAN A LAN usually using bus topology, star topology and ring topology. Medium : optical fibres, coaxial cables, twisted pair, wireless.

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LAN Three LAN Implementations Are Used Most Commonly

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LAN WLAN- a wireless LAN that uses no physical wires. Computers and devices that access a wireless LAN must have built-in wireless capability or the appropriate wireless network card, PC Card or Flash Card. A wireless LAN communicates with a wired LAN for access to its resources, such as software, hardware and the Internet.

MAN MAN-Metropolitan area network Developed in 1980s. Is a high-speed network that connects local area networks (LAN) in metropolitan area such as a city or town and handles the bulk of communications activity across that region.

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MAN A MAN typically includes one or more LANs but covers a smaller geographic area than a WAN. Generally covers towns and cities (50 kms)

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MAN MAN usually is managed by a consortium of users or by a single network provider that sells the service to the user. It used telephone companies, cable television operators and other organizations provides users with connections to the MAN. It have server to access a terminal to communicate with other computers.

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MAN Metropolitan area network

WAN WAN-A wide area network Developed in 1960s. Is a network that covers a large geographic area such a city, country or the world.

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WAN A WAN is more complicated and complex. Its required for many hardware and software to allow local network and Metropolitan network communicated. communication circuits connected by routers. Routers forwards packets from one to another following a route from the sender to the receiver. Store-and-Forward Hosts are typically connected (or close to) the routers

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WAN It using a communications channel that combines many types of media such as telephone lines, cables, and radio waves. A WAN can be one large network or can consist of two or more LANs connected together. The internet is the world’s largest WAN

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WAN The basic WAN service usually offers (for many years) is a Leased Line. A Leased Line is a point-to-point connection between two places, implemented by different transmission media, which creates one link between its nodes. An organization whose networks are based on such lines has to connect each office with one line, meaning that each office is connected to as many lines as the number of offices it is connected to, as shown in the figure below.

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Basic WAN

Differentiation of LAN, MAN and WAN LAN

MAN

WAN