Abstract: LAN common communication protocol is three TCP / IP protocol, NetBEUI agreements and IPX / SPX protocol. Where TCP / IP protocol is an agreement in the three most important, the Internet as an agreement, it is not the basis for possible without the Internet, any one of those with Internet-related, and it is impossible for the TCP / IP protocol was no doubt just the separation * . TCP / IP protocol that is very important, so most of the time, we have to cope with it and, although it is the public network protocol, but we should not be rigid adherence to it, but should try to deal more to learn and improve its objectives.Key words: TCP / IP, ISO, IPX / SPX, Winpcap, network protocol.
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