Networks

Networks

1. LAN

   • groups of computers can be connected so the update can be given to all instead of doing it one by one
   • LAN means local area network

2. WAN

   • you can connect anywhere in the world from 1 account
   • Wan means wide area network

3. advantages

   • you can print, use the internet whenever and wherever and email people
   • you can use shared logins

4. disadvantages

   • USB can hold viruse can break into your computer and take control of the computer
   • If you change a password on 1 computer it will only change on that computer so people will be able to use another computer to get in

5. Bus topology

   • The network consistes of a single cable that runs through the network
   • All devices attach to this single cable
   • advantage
     • Cheap to install
   • Disadvantage
     • -High chance in catasrphie
     • High chance in collision
     • More computers mean more collisons

6. Ring Topology

   • Computers are connected to each of the ring
   • Each computer recieves a message and if it is not intended reciepent, passes it on to the next computer
   • Advantage
     • Cheap to install
     • No collisions
   • Disadvantage
     • High chance of catistrophie fail
     • Difficult to add new computers

7. Star topology

   • All the computers are connected to a central switch
   • The switch directs the traffic to the appropiete computer
   • Advantage
     • Fast
     • easy to add computers
     • Low chance of catistrophic failer
   • Disadvantage
     • Expenisve
     • Failure of the switch

8. IP addres

   • An address is a unique identifier given to something
   • Computers on a network also need an address to identify them
   • any thing that uses the internet will have an IP addres

9. The internet

   • The internet is a huge global inter-connected network of devices
   • The internet is a giant mesh of compters
   • There are multiple different routes between any two nodes
   • It is impossible to break the internet, since another route can always be found

10. Mesh Topology

    • In Mesh topology it uses nodes which connect to one or more other nodes
    • If any nodes become unavaible it will find a different route to get to its destination

11. Packets

    • Huge amounts of data goes around the internet
    • All data on the Internet is splits up and goes into packets