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Subnetting

  • Solves fundamental problem with classful addressing:
    • Too many host addressed assigned to each classful network
    • IP addresses get used up too quickly
    • E.g. Class B network can have 65,534 IP addresses
      • Difficult to manage such a highly populated LAN
      • Results in poor performance
  • Benefits
    • Network documentation is easier to manage
    • Problems are easier to locate and resolve
    • Routers can more easily manage IP address spaces that don't overlap
    • Routing is more efficient when IP address spaces are mathematically related at a binary level
  • Useful resources:

Computer Science Networking