class B network address, 138.77.0.0. This would imply that you could make the following assumptions about the IP address 138.77.1.1. The network address is 138.77.0.0 and that the host address is 1.1, this is after all how a class B address is defined.If you did make these implications you would be wrong.CQU has decided to break its available IP addresses into further networks, called subnets, by using subnetting. Subnetting works by moving the dividing line between the network address bits and the host address bits. Instead of using the first two bytes for the network address CQU uses subnetting to use the first three bytes.CQU uses subnetting so the address 138.77.1.1 actually breaks up into a network address 138.77.1.0 and a host address of 1. The network 138.77.1.0 is said to be a subnet of the larger 138.77.0.0 network.4.10 WHY SUBNET?Subnetting is used for a number of reasons includingsecurity reasons,Using ethernet all hosts on the same network can see all the packets on the network. So it makes sense to put the computers in student labs on a different network to the computer on which student results are placed.physical reasons,Hardware networking, like ethernet, has physical limitations. You can't put machines on the Mackay campus on the same network as machines on the Rockhampton campus (they are separated by about 300 kilometers). The same applies for machines into different buildings.political reasons, andThere may be departments or groups within an organisation that have unique needs or want to control their own network. This can be achieved by subnetting and allocating them their own network.hardware and software differences.Someone may wish to use completely different networking hardware and software.4.11 HOSTNAMESIP addresses are fine for machines but they are difficult for people to remember. For this reason machines using TCP/IP also have host names. A fully qualified Internet host name follows the formathostname.site....
