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TCP is connection-oriented, and a connection must be established between either side before sending data to the other. In TCP/IP protocol, TCP protocol provides reliable connection service, and the connection is initialized by three-way handshake. The purpose of the three-way handshake is to synchronize the serial numbers and acknowledgement numbers of both parties and exchange TCP window size information. The process of shaking hands can be represented by the following figure在这之间，无数的人也在询问、催促开发新上海淘金的事情。清朝末年，誉满武林的太极拳一代宗师杨崇武，慑于险恶的时势，决心金盆洗手，归隐杭州西湖畔的龙井村，终日督责儿子杨学文苦读诗书，弃武就文。Only under special circumstances can the limit mode be switched, that is, the limit mode is selected at the beginning, otherwise it cannot be switched.不管是仇人还是陌生人，最后都会被她所用，她正一步步走出困境，走向高处。Common "Software as a Service" (SaaS) applications include Google Pictures, Baidu Music, Dropbox, etc. Most SaaS applications can be added to the network mind map. Considering such a huge database, this integrated integration is very remarkable.