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The full name of UDP protocol is user datagram protocol. It is used to process data packets like TCP protocol in the network and is a connectionless protocol. In the OSI model, the fourth layer, the transport layer, is the next layer above the IP protocol. UDP has the disadvantages of not providing packet grouping, assembling and sorting packets, that is, when the message is sent, it is impossible to know whether it arrives safely and completely.到那时，把一世的英名都葬送了。童富昌和方秀云我们常见那种生活社会最底层普通人，住一间即将拆迁带阁楼小房子里他们有六个孩子，都已成了家，也都有了自己小窝其中小儿子建设与父母同住建设妻子胡巾娣个虚荣而凶蛮女人，懦弱建设怕老婆，拿她一点没有办法为此，两个老人常受这个小媳妇气一天，78岁的童富昌不慎从楼梯上摔下来，送进了医院。郑老太太见了香荽，笑得眼睛眯成一条缝，一把搂在怀里不撒手，又问她为何到这时候才下学。二十世纪初叶，一场洪水，滔天而至，文阿陆与母亲在大水中天人永隔，徒留伤悲。三年后，某夜，广州府。月黑风高，“华清”浴室发生枪战，“聚源社”“义水轩”帮主双双死于乱枪之中。小裁缝文阿陆无意中撞见这一幕，平白无故惹上杀身祸，被赶来营救社主却误杀了社主的聚源社三当家于义龙，当场要灭口文阿陆仓惶奔逃，走投无路。