Networks

Networks

1. Disadvantages

   • Viruses can spread easily.
   • It can be difficult to set up.
   • It is expensive as alot of computers are needed.
   • If something goes wrong, it affects every computer.

2. Advantages

   • Files can be shared
   • Resources can be shared e.g printers
   • Logins can be shared

3. Types of Networks

   • LAN
     • Local Area Network
   • WAN
     • Wide Area Network

4. Topologies

   • Bus
     • Advantages
       • Cheap to install
     • Disadvantages
       • Lots of collisions
       • High chance of catastrophic failure
       • Slows down as more computers are added
   • Star
     • Advantages
       • Low chance of failure
       • No collisons (fast)
     • Disadvantages
       • Expensive
       • Depends on a switch
   • Ring
     • Advantages
       • Cheap to install
       • No collisions (fast)
     • Disadvantages
       • High chance of catastrophic failure
       • Difficult to expand

5. IP Addresses

   • A unique value assigned to every computer on a network for identificatiom
   • It comes out as 0s and 1s so it is changed to every 4 bit binary

6. Internet

   • Mesh Topologies
     • A message can take multiple routes if a path to the needed node is interrupted, it can take another path.
   • Routing
     • Each Node tests multiple different connections and assigns each a cost- lower cost, faster connection.
   • Packets
     • All data is split into small chunks and sent independently.
     • It means it may end up taking a completely different route, but will be re assembled on the other side.