Networks

Networks

1. LANS (Local Area Network)

   • Used in single organisations
     • School

2. WANS (Wide Area Network)

   • Used in large areas
     • World Wide Web

3. Network Topologies

   • Ring Topology
     • Connected in a circle
     • Fast because all data travels in one direction
     • If one cable breaks, all the computers will not work
   • Bus Networks
     • Joins all computers to one big cable called the backbone
     • Cheap and easy to install
     • If the backbone breaks, the whole network is unavailable
     • Not suitable for large LANs as too many computers can slow down the network
   • Star Network
     • Computers connected directly to the server using hubs or switches
     • If one cable breaks, all of the other cables will still work
     • Fast as each computer has their own line to the server
     • Expensive to buy hardware

4. Services and Hardware

   • Internet
     • WAN made up of smaller networks
   • Extranet
     • External network which can be viewed by different people at an organisation
   • Intranet
     • Internal network that is private to one organisation and viewable to employees only

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