Importance of Part Sizes

• Determine Number of Possible Networks, Subnets, or Hosts

• If There are N Bits in the Part, there can be 2N possible Networks, Subnets, or Hosts

• Actually, 2N-2

  • All zeros cannot be used for a part
  • All ones cannot be used for a part

• Example: if part has 8 bits, 28-2 possibilities (254)

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