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When sending a computer data, the data is sent to the share of the packet size. And frames are made.At the beginning of the discovery of the network 32-bit IP address was quite a lot. Through which 4.2 billion hosts can be connected together.
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How does NAT work? 
Network Address Translation works mainly through NAT server or gateway. There are two separate ports in the gateway. LAN port and one port. Local port in the LAN port has an IP block. One Ports One IP