Networks

Networks

1. Advantages

   • share files
   • share resources
   • share logins

2. disadvantages

   • cost of networks is expensive
   • increased risk- problems viruses affect every computer
   • difficulty- expertise is needed to set up and mantain network

3. LAN

   • local area network

4. WAN

   • wide area network

5. Network topologies

   • a network topology is the arrangment of computers and and other elements of a network
   • bus topology
     • advantage
       • cheap to install
     • disadvantages
       • high chance of catastrophic failure
       • lots of collisions
       • slows down as more computers are added
   • ring topology
     • advantages
       • cheap to install
       • no collisons
     • disadvantages
       • high chance of catastrophic failure
       • difficult to expand
   • star topology
     • advantages
       • low chance of failure
       • no collisions
     • disadvantages
       • expensive lots of cabling needed
       • always dependent on one switch

6. IP Address

   • 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
   • there are not enough IP Addresses to cover every computer on the internet so some are reused
     • unique addresses are assigned to bussinessess and houses
     • these houses and businessess run their own mini network inside with different IP addresses

7. A network is a connection of computers