Chapter 6 Notes - Chapter 6 Notes VLSM and CIDR Classful...

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Chapter 6 Notes – VLSM and CIDR Classful and Classless Addressing Classful IP Addressing Class A, B, C addresses defined with specific format for the high order bits (left- most bits in a 32-bit address) High Order Bits Class High Order Bits Start End Class A 0 0.0.0.0 127.255.255.255 Class B 10 128.0.0.0 191.255.255.255 Class C 110 192.0.0.0 223.255.255.255 Multicast 1110 224.0.0.0 239.255.255.255 Experimental 1111 240.0.0.0 255.255.255.255 Classful Routing Protocol Subnet mask of a network address could be determined by value of first octet, or (more accurately), the first 3 bits of address Classless IP Addressing IETF introduced Classless Inter-Domain Routing (CIDR), allow for: More efficient use of IPv4 address space Prefix aggregation, which reduced the size of routing tables CIDR compliant routers – address class is meaningless Network portion of address determined by network subnet mask (network prefix) or prefix length (/8, /19…) CIDR uses Variable Length Subnet Masks (VLSM) to allocate IP addresses to
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This note was uploaded on 04/29/2008 for the course ICTN 2154 taught by Professor Khoury during the Spring '08 term at East Carolina University .

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Chapter 6 Notes - Chapter 6 Notes VLSM and CIDR Classful...

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