To facilitate the expression and recognition, IP address is expressed as 210.52.207.2 decimal notation, each section can say decimal number biggest does not exceed 255. IP address consists of two parts, namely a Network number (ID) and Host number (ID) Host. The network number identification is Internet a subnet, but the host is in no logo subnet a station host. The address is decomposed into two domain, brought a important advantages: IP packets from the on a network to another network, choose path can be based on network instead of the host. In large Internet, this point advantage especially obvious, because the routing table only storage network information instead of host information, so can simplify routing tables.
summary
For general by routers and host composed of interconnected system, we can use the following methods defined system of subnet. In order to determine the subnet, separate mainframe and routers of each interface, resulting in several separate network island, interface is connected these separate networks of endpoints. These independent network in each called a subnet.
