networks

networks

1. advantages

   • share files
     • so the same files are available whichever computer you use.
   • share resources
     • such as printers and internet connection.
   • share logins
     • so the same username and passwords can be used on every computer on the network

2. disadvantages

   • cost
     • networks are expensive to set up
   • increased risk
     • problems such as viruses can affect
   • difficulty
     • expertise to set up and maintain a network

3. types of network

   • LAN
     • Local area network
     • a network in a small area or single organisation
   • WAN
     • wide area network
     • a network that spans a large area or multiple organisations

4. tropolgy

   • bus
     • advantages
       • it is cheap and only needs one wire
     • disadvantages
       • high chance of catastrophic failure
       • high chance of collisions
       • More computers means more collisions so the networks gets slower while it gets bigger
   • ring
     • advantages
       • cheap to install(one cable per computer
       • no collisions(only one computer is transmitting on each cable
     • disadvantages
       • high chance of catastrophic failure
       • difficult to add new computers
   • star
     • Advantages
       • fast (low chance of collisions)
       • Easy to add to new computers
       • low chance of catastrophic failue
     • Disadvantages
       • It is expensive s it needs a lot of cabling and a central switch
       • failure of the switch can take down the network

5. IP address

   • There are 4’228’250’625 ip addresses
     • for example 4’228’250’625 is my ip address and catmose
   • used to identify each computer and ip address is a unique address for each computer

6. internet

   • routes between nodes are chosen by the quickest time
     • the internet is a giant mesh of computers
   • large files are sent in smaller parts and are merged together at the end
   • the internet is a mesh topolgy