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香荽忙摇头道：王翰林说得我都不好意思了。徐彤自然如是，嗖的一声响，一条长鞭朝着尹旭的面门便去了。父亲年轻时，招惹上仇家，即使隐姓埋名，还是被仇家找到。父亲一再忍让，他想出手帮忙，也被父亲阻止。父子俩惨遭痛打，忍受屈辱之事。从此乡邻们看不起他们，同龄人唾弃他，谁都敢欺负他。他总是耐下心来给对方讲道理，可是从未奏效。百般屈辱下，他忍无可忍，终于出手了，一鸣惊人。他霍元甲的名气急速飙升，却引来了更多不怀好意的目光。父亲曾是威震四海的押镖师，因招惹太多是非，才举家隐于市，并且坚决不允许霍元甲习武。可是世事难料，霍元甲还是走上了功夫之路。但是他明确的告诉父亲：“我不会因为会武功，而走上您的老路Each object has its corresponding state, and each state corresponds to some corresponding behaviors. If an object has multiple states, there will be many behaviors. Then the judgment of these states and the behavior completed according to the states will lead to multiple conditional statements, and if a new state is added, the existing code needs to be changed. This kind of design obviously violates the principle of opening and closing, and the state mode is used to solve such problems.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.What will this book tell us//010Arbor Networks' Pravail Availability Protection System (APS) is specially designed for enterprises. It provides DDoS attack identification and mitigation functions that can be used after opening packages and have been tested in practice. Such functions can be deployed quickly with few configurations and even in the process of attack occurrence. Pravail APS focuses on protecting the network boundary from threats to availability, especially providing protection against application layer DDoS attacks, and can meet the increasingly severe challenges faced by managers when they are in DDoS attacks. By using a series of countermeasures, Pravail APS detects and blocks DDoS attacks, especially in cloud environment.