Networks

Networks

1. Network is a group of computers connected together.

2. advantages:

   • share files,files are available on any computer you log onto
   • share resources,such as printers and internet connectoin
   • share logins,the same username and password can be used in a different

3. disvantages:

   • expensive,extra hardware needed
   • more room for error,if somthing goes wrong it can affect every computer
   • difficult,it requires a technical experties
   • malware,viruses and software could spread through the network

4. different types of network:

   • WAN:
     • wide area network
     • consits multiple LANs network
     • spans a large geographical area or multiple organisations
   • LAN:
     • local area network
     • a network contained in a single geographical are

5. NETWORK TOPOLIGIES:

   • BUS:
     • advantages: cheap to install (only one needed)
     • disavantages: high chance of catastrophic failure , high chance of collisoins, more computers mean more collisoins(network gets slower)
   • RING:
     • advantages: cheap to instull (only one cable per computer)
       • no collisoins: 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 collisoin)
       • easy too add on new computers and a low chance of catastrophic
     • disavantages: expensive (needs lots of cabling) and the failure of the switch will take down the network

6. IP adressing:

   • An IP address is an 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 wether or not to keep the message