networks

networks

1. WAN

   • wide,area,network
   • a network that spans a large geographical area,or multiple organisations
   • often consists of multiple LANs networked together

2. LAN

   • local,area,network
   • a network contained in single geographical location or organisation

3. cost: networks are expensive to set up

4. increased risk: problems such as viruses can affect every computer in the network

5. difficulty: expertise is needed to set up and maintain a network

6. share files ,so the same files are available whichever computer you use

7. share resources such as printers and internet connection

8. share logins, so the same username and password can be used on every computer on the network

9. BUS, STAR, RING

   • BUS:a single cable runs through the network. It is cheep to instal.But there is a bid chance of a collision and slow the network down
   • STAR:All computers are connected by a switch.The switch directs the traffic to the appropriat computer.
   • RING:Computers are connected to each other through a ring.Communication only goes one way.Its cheep to instal and one cable per computer

10. network addresses

    • IP adresses-internet protical adress has to be unique
    • the internet is a huge network with more divices than it is possible to assign a unique address
    • unique addresses are assigned to businesses and houses.these house and busnisses run their own mini-network inside with cliffenent IP adresses