networks

networks

1. LAN

   • local area network
     • smaller area
     • single organisation

2. WAN

   • wide area network
     • large area
     • multiple organisations

3. advantages

   • share files
   • share resources
   • share logins

4. disadvantages

   • cost
     • networks are expensive to set up
   • difficult
     • expertise is needed to set up a network
   • problems
     • viruses
       • effects every computer in the network

5. topology

   • bus
     • cheap
     • collisions
   • ring
     • cheap
     • hard to add computers
   • star
     • fast
     • expensive

6. IP addresses

   • • unique addresses
       • run their own mini network
   • its a unique value
   • messages have an IP address

7. the internet

   • a giant mesh of computers
   • impossible to break
   • routes
     • find the lowest cost route between two nodes
   • data is split into small chunks
     • packets
   • packets are sent on the cheapest route
   • packets can be re-assembled