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Visitor mode is to encapsulate some operations applied to a certain data structure. Once these operations need to be modified, the data structure that accepts this operation can be saved unchanged. Visitor mode is suitable for systems with relatively stable data structures. It reduces the coupling degree between data structures and operations acting on data structures, making the set of operations relatively free to change. The specific structure diagram is as follows: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.北魏文孝帝大和年间，北国突厥可汗吐利大肆兴兵，谋图中原。Fabric immersed in dyed leaf juice荒郊野外，深山老林，一辆失事的汽车斜倚在山坡上，其周身弥漫着死亡的气息。副驾驶座上，一个男人从昏迷中苏醒，他全身上下到处是伤痕，右腿更骨折且被变形的车紧紧夹住。糟糕的是，因为车祸时的剧烈冲击，令他出现暂时性的失忆。他不知道自己的姓名与身份，从何而来，因何险些横尸这片森林之中，后作那个正慢慢腐烂的男人跟他又是怎样的关系。在猜测身份的过程中，这个男人还必须面对更为严重的生计问题，车上不仅没有食物水源，外面更有各种凶猛的野兽四处逡巡，死神的身影从未离开半分。 不久，一名女性出现在车子附近，而从车在广播中男人似乎也渐渐明了自己的真实身份.天使的世界，小天使长大了开始了新的生活。该剧以康熙年间的史实为背景，讲述了一出扑朔迷离的科举舞弊案：江南才子伍思贤踌躇满志参加科考，万料不到竟名落孙山，目睹了科场丑恶行径的他大闹贡院，书生群起响应，朝野震惊。新任江苏巡抚张伯行临危受命调查科考案，在凶险的“权谋”争斗中，张伯行锒铛入狱，美貌娇妻惨遭迫害……