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An IP address is a 32-bit address. The IP addresses are unique.
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What is an IP address • A way to identify machines on a network • A unique identifier
IP usage • Used to connect to another computer • Allows transfers of files and e-mail
IP structure • IP addresses consist of four sections • Each section is 8 bits long • Each section can range from 0 to 255 • Written, for example, 128.35.0.72
IP structure • These four sections represent the machine itself and the network it is on • The network portion is assigned. • The host section is determined by the network administrator
IP structure • 5 Classes of IP address A B C D and E • Class A reserved for governments • Class B reserved for medium companies • Class C reserved for small companies
IP structure • Class D are reserved for multicasting • Class E are reserved for future use
IP structure • Class A begins 1 to 126 • Class B begins 128 to 191 • Class C begins 192 to 223
Reserved addresses • Addresses beginning 127 are reserved for loopback and internal testing • xxx.0.0.0 reserved for network address • xxx.255.255.255 reserved for broadcast
IP Addresses • IP addresses are: • Unique • Global and Standardised • Essential
Subnetting - Why? • Division of local networks • Greater number of networks • Simplifies addressing
Network Network Host Host Network Network Subnet Host Network Network Subnet Subnet/Host Subnetting - How • Bits borrowed from host field
Subnetting -Example • 130.5.0.0 - Network address • 130.5.2.144 - Host address • 255.255.255.0 - Subnet Mask • 130.5.2.0 - Subnet
Where do you want to go Tomorrow? • Computer controlled dwellings • Road and rail systems • Criminal tagging
The Internet Protocol • Running out!! • Upgraded to IPv6