Classless addressing

• Forget old Class A, Class B, Class C terminology and restrictions

• Internet routing and address management today is classless

• CIDR = Classless Inter-Domain Routing

  • routing does not assume that class A,B,C implies prefix length /8,/16,/24

• VLSM = Variable-Length Subnet Masks

  • routing does not assume that all subnets are the same size

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