Networks

Networks

1. Types of networks

   • LAN
     • Local area networks
     • A network in a single geographical area
   • WAN
     • Wide network
     • Over a large geographical area
     • Usually consists of multiple LAN

2. Disadvantages of networks

   • Extra hardware and wiring needed
   • If something goes wrong it affects every computer
   • Needs professional expertise
   • Viruses spread throughout the whole network

3. Advantages of networks

   • The same files are available on whatever computer
   • The same username and password can be used on any computer
   • You can share printers and the internet

4. Topology

   • Bus
     • Advantages of bus
       • Cheap to install
     • Disadvantage
       • high chance of failure
       • Lots of collisions
       • Slows down speed of computers
   • Ring
     • Communication only goes in one direction
     • Disadvantages
       • high chance of failure
       • Difficult to add computers
     • Advantages
       • Cheap to install
       • No collisions
   • Star
     • All connected to a hub or switch
     • Advantages
       • fast
       • easy to add new computers
       • Low chance of failure

5. IP adress

   • A unique value assigned to every computer
     • on a networks used to identify it
   • Messages on a network have an IP adress attached
     • This is how a computer knows whether or not to keep the message

6. The Internet

   • The internet is arranged with devices in mesh topology
   • Mesh has excellent resilience to outages
   • A cots is assigned to each connection in a mesh
   • route finding algorithms are used to find the lowest cost route between two nodes
   • all data is split up into chunks called packets

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