Classful vs Classless - Classful vs Classless Routing IP...

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Classful vs. Classless Routing IP Classful subnetting ‘rules’ IP Classless subnetting ‘rules’ Classes identified by value of 1 st octet and class identifies purpose of 32 bits ( Network , Host ) Class A: 1 – 126 ( N . H.H.H ) /8 Class B: 128 – 191 ( N.N . H.H ) /16 Class C: 192 – 223 ( N.N.N. H ) /24 Note: 127 is reserved for loopback testing Classes identified by value of 1 st octet and class identifies purpose of 32 bits ( Network , Host ) Class A: 1 – 126 ( N . H.H.H ) /8 Class B: 128 – 191 ( N.N . H.H ) /16 Class C: 192 – 223 ( N.N.N . H ) /24 Note: 127 is reserved for loopback testing Borrow host bits to become ‘ subnet ’ bits Borrow host bits to become ‘ subne t’ bits Borrowed bits are added onto default subnet mask Borrowed bits are added onto default subnet mask Must borrow at least two bits Must borrow at least one bit Must leave behind at least two bits Must leave behind at least two bits Number of subnets required identifies how many bits to borrow Number of hosts required per subnet identifies how many bits to borrow Wastes addresses Limits waste of addresses Must assign full subnet of addresses
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  • Fall '12
  • Black
  • Subnetwork, Classless Inter-Domain Routing, subnet mask, Borrow host bits

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