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What is Local Area Network(LAN), Wide Area Network(WAN), Metropolitan Area Network(MAN)?

 LAN  
  Local Area Network a group of computers connected within a 
building or a campus  (Example of LAN may consist of computers
located on a single floor or a building or it might link all the computers in a small company. 
            – Span office or building
            – Single hop (shared channel) (cheap!)
            –  User rates: 10 Mbps
            – 1 Gbps E.g., Ethernet, Token rings, Apple-talk

    MAN
Metropolitan Area Network is a network System that covers area of a single city.  Usually , MAN Connects more than one LANs in a city Town  that covers a small geographical area then a WAN .
               Example cable TV ,telephone companies . 

Fig:  Metropolitan Area Network

                                                                                                        

   WAN 
 A network consisting of computers of LAN's connected across a distance WAN can cover small to large distances, using different Topologies such as telephone lines, fiber optic cabling, satellite transmissions and microwave transmissions.
               – Span large areas (countries, continents, world)
            – Use leased phone lines (expensive!)
                       1980’s: 10 Kbps, 
                       2000’s: 2.5 Gbps 
                       User access rates: 56Kbps
             – 155 Mbps typical
             –  Shared comm links: switches and routers 
                  E.g, IBM SNA, X.25 networks, Internet
             
                                      Fig:  Wide Area Network

Difference between LAN and WAN?






                                                  

                                                   


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