Networks

Networks

1. Types of Networks

   • WAN
     • Computers anywhere in the world connected
     • Connected by telephone network or satellites
     • Internet is an example of WAN
   • LAN
     • All networked computers on the same site
     • Direct links connecting computer
   • Star Network
     • Most expensive network
     • Reliable if one cable is broken, network continues
   • Ring Network
     • More affordable than star network
     • Data flows in one direction
     • If one cable is broken the network fails
   • Bus Network
     • More expensive than a ring network
     • Less expensive than a star network
     • Data flows both ways
     • Central cable is key

2. Internets and Intranets

   • Internet
     • Computers linked using existing telephone lines or satellites
     • Sharing of unlimited amount of data
       • messaging
       • shopping
       • Banking
       • Teaching
       • Advertising
     • Generally unrestricted by Governments
   • Intranet
     • provides similar services
     • Limited to one company or school
     • Access restricted