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Network is connecting set of two or more computers that can share thier details such as document file, video, audio, printers, software, and internet connections. Networked computers can also share files without having to transfer the data using a disk or USB drive. And users of networked computers can also communicate electronically without use of the internet.
Computers within a network can be linked several ways: though cables, telephone lines, radio waves, satellites, or infrared beams. There are also three basic types of networks:
Local Area Networks (LANs),
Metropolitan Area Networks (MANs),and
Wide Area Networks (WANs).
Local Area Networks
A Local Area Network (LAN) is basically a smaller network that's connect to a small area. Examples of common LANs are networked computers within a building, school, small office or lab.
Within a LAN network, one computer is the file server. This means that it stores all data that controls the network, and it also stores the data that can be shared the computers within the network. The file server should consider the heart of the network.Most of LANS are connected through cables(eg. Straight cable, cross cable.)
The computers attached to the file server are called workstations. Workstations can be less powerful than the file server because they don't have to store as many data's and applications as the file server, and they are not always on and working to keep the network up and running.
Metropolitan Area Networks
A Metropolitan Area Network (MAN) connect two or more computers(LANs) together but not the boundaries of a city, town, or metropolitan area. Within this type of network is also the Campus Area Network, which is generally smaller than a MAN, connecting LANs within a limited specific area, like a university campus, military base, or industrial complex.
Wide Area Networks
Wide Area Networks (WAN) connect larger functional areas. Often, smaller LANs are interconnected to large WAN. For instance, an office LAN in United States may be connected to office LANs for the same company in UK, Paris, ect to form a WAN spanning the whole company. The individual offices are no longer part of individual LANs, they are instead part of a worldwide WAN.
The connection of this type of network is complicated. WANs are normally connected using multiplexers connect local and metropolitan networks to global communications networks like the Internet.
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