NETWORKS

NETWORKS

1. Types of Network

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

2. Disadvantages

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

3. Advantages

   • Consistent user experience
     • Log on to any computer in the network
   • Files are always available
     • even if created on another computer
   • print
     • by using the internet, email or same software on any computer

4. types of topology

   • Bus Topology
     • cheap ( one wire needed )
     • high chance of catastrophic failure
     • high chance of collisions
     • slower as it gets bigger
   • ring topology
     • cheap
     • no collisions
     • high chance of catastrophic failure
     • difficult to expand
   • Star topology
     • low chance of failure
     • no collisions
     • expernsive
       • depends on switches

5. IP Addresses

   • Globally on the Internet there are 4’228’250’625 devices
   • the lowest is 0.0.0.0
   • the highest is 255.255.255.255
   • there are 'internal' and 'external' IP addresses
   • not enough IP addresses for the world

6. internet

   • mesh topology
   • multiple different routes
   • Data is split into small chunks called packets
   • The packets are re-assembled on the other side
   • Each packet is sent along the lowest cost route
   • A cost is assigned to each connection in a mesh
   • As the costs change because nodes become more or less busy, new routes are needed