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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.Imagine, Qu goblin on that occasion, the old man wants to drink together, how will act, think about all feel interesting.Digital thinkingCommand mode belongs to the behavior mode of an object. Command mode encapsulates a request or operation into an object, and separates the responsibility of issuing the command from the responsibility of executing the command through abstraction of the command. The implementation of command mode can provide the functions of revocation and recovery of commands. The specific structure diagram is shown below.　　陈汉昌和徐掌柜的女儿玉珠无意中相识。陈汉昌喜欢上了天性聪慧、多才多艺的玉珠。二人前去鸡场看斗鸡，被王子敬的手下邢副官跟踪，邢副官安排人绑架了玉珠。陈汉昌救下了玉珠，二人深深地相爱了。该剧讲述的是1948年，硝烟弥漫的关中大地上，在犬牙交错的战场情势下，猛虎营女营长陈大蔓临危受命：护送我军一支身怀六甲的孕妇队紧急转移。几十名怀有身孕的女兵在远离大部队、紧急向后方转移途中，不幸进入敌纵深部，被层层裹挟其间，险象环生。敌军为获取情报，对这支特殊的娘子军步步紧逼，穷追不舍。陈大蔓和姐妹们不屈不挠，在沟壑山涧、村前屋后、街巷树丛间与敌展开了巧妙的周旋，以无畏的勇气和智慧冲破敌军和土匪的围追堵截，克服了险恶环境下的重重困难，终于走出战争的硝烟，胜利归队。