networks

networks

1. advantages

   • you can use any computer
   • print from any device
   • you can access files from any computer

2. disadvantages

   • it is expensive
   • difficult to remove virus from networks
   • more room for virus

3. LAN

   • local area network
     • geographical location of organisation

4. WAN

   • wide area network
     • often consists of multiple organisations

5. topologies

   • bus topology
     • the network consists of a single cable
       • all devices attached to a single cable
         • advantages
           • cheap install
             • disadvantages
               • failure likely
   • ring topology
     • cheap to install
     • high chance failure
     • advantages
       • disadvantages
         • high chance failure
     • computers are connected to each other in a ring
   • star topology
     • advantages
       • disadvantages
         • expensive
       • fast one cable
     • all computers are connected to a central switch

6. ip address

   • the internet is to big to give every device a unique ip address.
   • we get around this by assigning an external ip address to each house or business
   • ip address can range from 0, 255

7. the internet

   • giant mesh of computers
   • multiple different routed
     • data travels in packets huge
       • each pack is sent along the lowest cost route