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According to statistics, SYN attack is the most common and easily used attack method among all hacker attacks. I believe many people still remember the attack on YAHOO website in 2000. At that time, hackers used simple and effective SYN attacks. Some network worms cooperated with SYN attacks to cause greater damage. This paper introduces the basic principle, tools and detection methods of SYN attack, and comprehensively discusses the prevention technology of SYN attack.小葱诧异地反问：我跟泥鳅的事闹得那样，转头我就找你，你觉得我该这样？李敬文哑口无言。Independent Impact:Dip plating　　他在异世界接下的任务只有一项──「杀了被预言会带给人类灾厄的『勇者』」。The operation of "QQ Flying Car Tour" reproduces all the operations on the end tour, retaining the operations of drift, continuous spraying, landing spraying, etc. In the game, the traditional racing game mode is adopted, with the left hand direction and the right hand controlling drift, brake and props.