(An IP address is to assign a unique network address worldwide to each host directly connected to the Internet. Today, most of them use 32-bit IPv4 addresses, which consist of two parts, the network number and the host number. When addressing, the router first finds the network according to the network number net-id in the IP address; after finding the destination network, it then finds the host according to the host number HO.ST-id in the IP address)
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