Many LANs mix elements from both client- server and peer-to-peer models.

Client-server LANs
A client-server LAN consists of the requesting micro –computer, called clients, and the supplying device that manages shared device, such as laser printers. The server microcomputer is usually a powerful one, running on a powerful chip such as a Pentium. Client-server network, such as those run under novels’ Netware operating system .are the most common type of LAN. 
Client-server LANs


There are maybe different servers for managing different tasks-files and a program, databases, printers, the one you may hear about the most often is the file server. A file server is a computer that stores the programs and data files shared by users on a LAN. It acts like a disk drive but is in a remote location. A database server is a computer in a LAN that stores data. Unlike a file server, it does not store programs, a print server is a computer in a LAN that controls one more printers, it stores the print –image output to the printer or printers one documents at a time. Fax servers are dedicated to managing fax transmissions, and mail server manages electronic mail.



Peer to peer LANs: 
The word peer denotes one who is equal in standing with another  (as in the phrases “peer pressure” or jury of one’s peers”) a peer-to- peer LAN is one in which all microcomputers on the network communicate directly with one another without relying on a server. Peer- to-peer network are less expensive than client-server network and work effectively with up to  many computers. Beyond that they slow down under heavy use. 
Peer-to-Peer


They are thus appropriate for work teams computing. It is also called collaborative computing. Enables teams of co- workers to use networks of microcomputers to share information and cooperate on project. Software used for peer-to-peer networking includes LANtastic by Microsoft. 

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