1.05a.  Local Area Networks (LANs) ◦ Small networks in a limited geographical area  Wide-Area Networks (WANs) ◦ Extensive networks that may span hundreds.

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Presentation transcript:

1.05a

 Local Area Networks (LANs) ◦ Small networks in a limited geographical area  Wide-Area Networks (WANs) ◦ Extensive networks that may span hundreds of miles  Public Access Networks (PANs)  Value Added Networks (VANs)  Virtual Private Networks (VPNs)  Metropolitan Area Network (MAN)

 Private networks, for businesses, organizations or schools, with computers located in the same building or area.  Provides convenience for multiple users to share programs, data, information, hardware, software and other computing resources.  Uses a special computer called a file server to house all network resources  Allows users to access programs and data from the file server.  The print server allows multiple users to share the same printer.  Using networks saves companies money in hardware, software, and related costs.

 Span large geographical areas connecting two or more LANs.  Use to share data between separate networks by Government, Universities, & large Corporations.  Typically make use of high-speed leased telephone lines, wireless satellite, or both.

 Wide-Area networks operated and maintained by a large company.  Provides voice and data communication for a fee.

 Value Added Networks (VANs) - Business that use facilities of large communication companies to provide subscribers with additional services.  Virtual Private Networks (VPNs) – a cost effective way to expand network use  Metropolitan Area Network (MAN) – a wide area network limited to specific site, such as a city or town.

 The layout or pattern by which the network is organized.  Common topologies ◦ Bus ◦ Star ◦ Ring

 A sing line of cable with two endpoints links all computers.  All communications travel the full length of the bus  Each computer network transceiver checks the message for its intended destination

 Multiple computers and peripheral devices are linked to a central computer called a host.  The host computer is generally a more powerful midrange or mainframe computer.

 There is NO Host Computer  Each computer is connected to two other computers in a circular path.

 Networked personal computers, workstations, or terminals (clients) can send request to, and receive services from, a more powerful computer (a server).

 Computers that comprise the network have equivalent capabilities and responsibilities.  Each computer acts as both client and server.