Chapter 6 Variable Length Subnet Masking (VLSM) Classless Inter ...
Chapter 6 Variable Length Subnet Masking (VLSM) Classless Inter ...
Chapter 6 Variable Length Subnet Masking (VLSM) Classless Inter ...
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Classful IP Addressing• ARPANET – 1969• By 1989, it wastransformed intowhat we now callthe <strong>Inter</strong>net.• 1989 – 159,000• By 2000, it grewto over 72million hosts.• As of January 2008,there were over 541 million hosts on the <strong>Inter</strong>net.• Without <strong>VLSM</strong> and CIDR, the IPv4 address space wouldhave been exhausted long ago.CCNA2-5 <strong>Chapter</strong> 6High-Order Bits• In the original specification of IPv4 (RFC 791), released in1981, the authors established the classes to provide threedifferent sizes of networks for large, medium, and smallorganizations.• As a result, Class A, B, and C addresses were defined with aspecific format for the high-order bits.CCNA2-6 <strong>Chapter</strong> 6
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