networks

networks

1. types of networks

   • LAN
     • local area networks: a network in a small area or single organisations.
   • WAN
     • Wide area network: a network that spans a large geographical area, or multiple organisations.

2. disadvantages

   • expensive: extra hard ware and writing needed.
   • difficult: it requiers a technical expert.
   • more room for error: if somthing goes wrong it can affect every computer.
   • malware: viruses and other maliuious software can spread through the network.

3. ADVANTAGES

   • share flies: 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 password can be used on every computer on the network

4. a network is a group of computers who together comunicate.

5. TOPOLOGY

   • Network topologies he arrangement of computers and other elements of a network.
     • BUS
       • advantages
         • cheap
       • disadvantages
         • catasrophic faliure
         • data collision
         • slow
     • RING
       • advantages
         • no data collisions
         • cheap
       • disadvantages
         • catasrophic faliure
         • difficult to extend
     • STAR
       • advantages
         • no data collisions
         • low chance of catasrophic faliure
       • disadvantages
         • more expensive

6. IP ADRESS

   • an ip address is a unique value assigned to every computer on a network used to identify it.
   • messages on a network have an IP address attached which is how a computer knows whether or not to keep the message
   • the internet is a huge network with more devices than is possible to assign a unique address too.
   • unique addresses are assigned to buisnesses and houses.
   • these houses and buisinesses run their own mini network inside IP addresses

7. MESH

   • this is the topology of which the internet is made up of.
   • NODES
     • there are multiple different routes between two nodes