(The main function of the subnet mask is to inform network devices which part of a particular IP address contains the network address and the subnet address, and which part is the host address. The routing device of the network only needs to identify the network number and subnet number of the destination address to make a routing addressing solution. The host part of the IP address does not participate in the routing addressing operation of the router, and is only used to identify only one in the network segment. The interface of the network device.)
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