computer science

computer science

1. wide area network big geographical area expensive to set up the internet is a wan

2. local area network small geographical network e.g schools homes and small offices

   • a client sever network is managed by a server every computer is connected to the main server
     • each layer serves the layer above it

3. bandwidth is the amount of data that can be transferred in a given time the greater the bandwidth the better the network

   • wired connections [ faster / reliable ]
     • clients send requests to the server
     • http ftp smtp tcp ip ethernet
       • tcp/ip is the protocol which dictates

4. user accounts are stored centrally sharing files is easier

   • layer 1 link layer layer 2 network layer layer 3 transport layer layer 4 application

5. you can communicate with lan users cheaply and easily with instant message

   • pop3 imap
   • a layer is a group of protocols which have similar functions

6. fibre optic cables can give better performance

7. you can share the same hardware like printers on a lan

8. the internet is the biggest wan