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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.一个恶毒的巫婆嫉妒苏菲的制帽技术，用巫术把她变成了一个80岁的老太婆，而且苏菲还不能对别人说出自己身中的巫术。无奈，苏菲决定独自一人逃离小镇。天黑了，虚弱的苏菲没走多远，来到了移动城堡。心想自己已经是老太婆了，苏菲壮着胆子走进了城堡。不想，遇到了和她遭遇相同的火焰魔。两人约定彼此帮助对方打破各自的咒语……于是两封信都到了严首辅手上，这犯太岁的麻烦事，严首辅也不愿意管，交给兵部走流程，兵部更不敢管，反过来求内阁给个指导。　　此剧讲述了女主被4位男生追求，逐渐成长的故事。七月毕业季，人生中最美好、最热烈的夏天，每个年轻人都抱着对未来的茫然尽情狂欢。热爱自由、特立独行的顾悠悠（张予曦饰）热爱街舞，在老妈（黄小蕾饰）的期许下学习着芭蕾舞，在每个人的青春时代，有彷徨也有热血，但都面临最终的选择，在男朋友毛雪山（黄景行饰）的鼓励下，顾悠悠决定跨出追寻梦想的那一步，拒绝了中央芭蕾舞团的邀请……亲情、爱情、梦想的激烈冲突，让毕业季的夏天热闹非凡。板栗笑道：去吃了才亏呢。青城市，五岳集团总裁李克文被绑架，保镖司机二人死。李克文家收到三百万美元的勒索信，落款是一只惟妙惟肖的“猫头鹰”。刑警队密切跟踪送赎金的李夫人。省刑警学院考官常征带学员在公安厅密切关注此起案件，常征判断准确，赎金交付方式是从火车上抛下钱袋。绑匪顺利拿到赎金，但却是假币，而李克文被杀。