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The attacker first completes the three-way handshake to establish the connection, but in the last ACK reply of the three-way handshake, the TCP window size is set to 0, and then a data request is made. When the attack target sends the request result to the attacker, it stops the data transmission when it finds that the TCP window size is 0, and sends out a TCP window detection packet to ask the attacker if the TCP window has been updated. Since the attacker will not update the window size, the attack target will always maintain the TCP connection and wait for the data to be sent, and continuously carry out TCP window size detection. When the number of controlled hosts in the botnet is large, Target's connection table will gradually be exhausted, resulting in denial of service.《W》是奇幻爱情电视剧，是讲述30代初半男女们的故事。　　该剧主要讲述了几个时尚、睿智的都市男女在职场及情感生活中面对各种挑战，勇敢抉择，不断突破自我的故事。值得一提的是，虽然本剧的故事发生于职场，但与近两年颇为流行的职场励志剧不同，其剧情不仅包括各自间的勾心斗角，揭示职场生存法则，更引入不同商业利益集团相互安插卧底的博弈斗争，一步步揭开真相，引领剧情层层深入，堪称美女版的《无间道》。　　新来的女县长打破了北方贫困县里原有的人际关系的平衡，一起廉政措施引起了县长与副县长、副县长与副县长之间，以及县长与县委书记、副书记、宣传部长之间错综复杂的矛盾冲突，于是本剧的主人公，一位叫李德林的县委办公室副主任充当了各种矛盾之间的“润滑油”。司妍是一名小有名气的美妆博主，意外进入了国风美妆游戏VR系统，傲娇大小姐惨沦为底层梳妆小侍女，司妍凭借高超的美妆技巧，辅之身为网络博主热点营销、宣传推广等跳脱搞怪的现代技能过关斩将，虏获一众夫人小姐欢心，各个风格迥异的妆品妆面，为之妆点的不只是姣好面容，更是妆容背后现古今女子的悲欢故事与人生态度。