(We know that the working principle of Sniffer is very simple. It is to set the network card to the thick mode (called promiscuous). The so-called thick mode is to accept the full data packet and put it into the memory. We know that under normal circumstances, the PC only accepts The destination mac address is the own network card or the broadcast or multicast data packet. This is how sniffer receives all the data packets and analyzes them.)
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