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Although this kind of attack has appeared for 14 years, its variants can still be seen today. Although technologies that can effectively combat SYN flooding already exist, there is no standard remedy for TCP implementation. You can find different implementations of different solutions to protect the application layer and network layer in today's operating systems and devices. This paper describes this attack in detail and looks forward to and evaluates the anti-SYN flooding methods currently applied to end hosts and network devices.Distributed Denial of Service Attacks: Multiple attackers in different locations attack one or several targets at the same time, Or one or more attackers take control of multiple machines located in different locations and use these machines to attack the victim simultaneously. This kind of attack is called Distributed Denial of Service attack because the point of origin of the attack is distributed in different places.名为三坪房间的钢琴师的青年在串流网站上发布演唱Piano Man的视频，点燃了周围人们的心，彼此的人生交错在一起，在不知不觉中，互相帮助、鼓励。爱一个人你会等多久？科学家终于发现了往返古今、令时光倒流的神秘缺口，却无法估计原始恐龙一旦造访，今天的洛杉矶，将会出现如何灾难性的暴虐……板栗兄妹不怀好意地看向大苞谷，都为他肩上担的重担捏一把汗。　　孙光明自己也悄然发生了转变，从最开始的工作狂，美食家，变成了一名合格的第一书记。而他和可爱的村民们也在不断的碰撞出新的火花……