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The main reason why DDOS attacks are difficult to defend is that there are too many vulnerabilities and attack methods that can be exploited. In the OSI seven-layer network model used in the network data transmission process, basically each layer has protocols that can be exploited by DDOS attacks. According to the different network levels of the protocols used for DDOS attacks, this paper summarizes the currently known DDOS attack types and their defense measures as shown in Table 1-3. For more detailed information on current DDOS attack and defense, please refer to Huawei DDOS attack and defense summary post.许负向来神奇，所以她这样说，李玉娘心中也就生出了一种异样的感觉。啊？顾小玉的心灵莫名一颤，脸颊微微红了起来。二十世纪初叶，一场洪水，滔天而至，文阿陆与母亲在大水中天人永隔，徒留伤悲。三年后，某夜，广州府。月黑风高，“华清”浴室发生枪战，“聚源社”“义水轩”帮主双双死于乱枪之中。小裁缝文阿陆无意中撞见这一幕，平白无故惹上杀身祸，被赶来营救社主却误杀了社主的聚源社三当家于义龙，当场要灭口文阿陆仓惶奔逃，走投无路。其他人稍有异动，岂不是要露馅？众人哈哈一笑，事情本就有很多巧合和偶然因素在内，恰当的人在恰当的时候行动，事情便成了。睡美人动漫版进屋说，进屋说……黄胖子慌慌张张推着杨长帆。