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computer networks

Powerful Essays
1. DEFINITION OF LAN

Local Area Network (LAN) is a communication system connecting hundreds of computers and peripherals within a radius of a few kilometres. Appeared in the 1970s, LAN has experienced a tremendous growth with the development of the microcomputer in the 1980s and the advent of the Ethernet communication standard. Conversely, the wide area network (WAN) can bring together thousands of computers that are separated by hundreds, or even thousands of kilometres.

There are also wireless LAN networks. A wireless LAN (Local Area Network) allows you to connect to your computers without wires or cables. Thanks to a wireless LAN network, employees can access easily to documents, e-mail messages, applications and other resources, and therefore enjoy full mobility. A wireless LAN network uses radio waves to enable mobile devices to connect and communicate within a certain area.

2. UTILITY

The local network is designed:

- pooling data common to several users (accounting files for example..)
- to share devices (FAX, MODEM, printers CD ROM drive..)
- to share access to the Internet
- to share applications: ex: sharing an application suite
- share documents (Excel workbook, text Word, shared database) to access an Intranet site;

In addition, older equipment may be connected to the network and benefit from the resources of the server.

3. CONCEPTS OF LAN
A network, used to connect computers together. But the needs are very different, since the home network or small business networks of large corporations. See two fundamentally different approaches that one could easily evolve into another.

3.1. “Peer to Peer”

• Workstations are simply connected together by the network. No machine plays a special r...

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...physical cables from one location to another; the installation is fast and inexpensive. It is also easier to provide network connectivity in difficult locations to access, such as warehouses or manufacturing plants.

• Scalability: a wireless LAN can usually be extended with existing equipment, so that a cable network may require extra cables or other equipment.

• Safety: the control and management of access to your wireless LAN network are important aspects for the success of its implementation. The latest advances in WiFi technology provide robust protection and allow you to ensure that your data are easily accessible through the wireless LAN network only to authorized persons.

• Cost: a wireless LAN network operating costs are relatively low, with a reduction or even a deletion of the costs of wiring when the reconfigurations, extensions or removals of offices.
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