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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.Determine whether the event object has passed or not, and then add it to the event pool.好莱坞惊悚大片《密室逃生2》由《速度与激情》系列金牌制片人重磅打造,前作曾创下中国影史进口惊悚片票房冠军。续作在闯关难度和惊险刺激程度上全面升级,集结全球顶级玩家合力解锁超高难度密室,开启命悬一线的残酷生存之战。像太阳一样灼人的他......足以灼烧所有的人，让人疼痛，甚至包括他爱的人。一群被称为秘密妓房的特务跟一个叫做十二宫图的机构斗智斗勇。这是一个控制著Joseon且渴望权力的机构。 Min Chung Seol是一个贵妇人，她的家人都被杀害了，而她最後跟Ang Shim Jung 联手，也就是那样她遇到了Kang Ye Rang。