computer networking

computer networking

1. advantages

   • Malware – viruses and other malicious software can spread through the network
   • Difficult – it requires a technical expertise
   • More room for error – if something goes wrong it can affect every computer
   • Expensive – extra hardware and wiring needed

2. disadvantages

   • Share Logins, so the same username and password can be used on every computer on the network.
   • Share resources such as printers and Internet connection.
   • Share files, so the same files are available whichever computer you use

3. lan

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

4. wan

   • wide Area Network
   • A network that spans a large geographical area, or multiple organisations
   • Often consists of multiple LANs networked together

5. topoligies

   • bus
     • The network consists of a single cable that runs through the network
     • All devices attach to this single cable
     • disadvantages
       • High chance of catastrophic failure (a break in the central cable takes out the entire network) High chance of collisions (multiple communications on the same cable that corrupt each other, slowing down the network) More computers mean more collisions, so the network gets slower as it gets bigger
     • advantages
       • cheap
   • ring
     • Computers are connected to each other in a ring
     • Communication only goes in one direction
     • Each computer receives a message, and if it is not the intended recipient, passes it on to the next computer
     • No central cable, each connection is between two computers
   • 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 (if any cable breaks or any computer goes down, the entire network fails Difficult to add new computers
   • star
     • The switch directs the traffic to the appropriate computer
     • All computers are connected to a central switch.

6. IP Adress

   • each device has a unqui IP Adress
   • enternal
     • the houses house IP adress
   • internal
     • devises in the house.