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IP Routing Primer by Robert Wright

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Understanding Subnet Masks, Subnetting, and Supernetting

The network addresses previously discussed represent only one physical network. If you have all of your hosts connected to the same piece of physical network equipment, such as an Ethernet 10BaseT hub, you only need one network address. In this case, you could decide to use 125.0.0.0 as your network address and assign host addresses from 125.0.0.1 to 125.255.255.254.

You can't use 125.255.255.255 because this is the all hosts address. Any packets with this destination address will be received by every host in the 125.0.0.0 network. This is otherwise known as the broadcast address for network 125.0.0.0. It requires that all digits in the second, third, and fourth octets be set to 1. The ...

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