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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.然后男主角背负一把玄铁重剑，亦正亦邪，横行江湖？只是，用玄铁重剑施展《独孤九剑》，似乎有些不搭啊？而且令狐冲也用《独孤九剑》，现在这个男主角也用《独孤九剑》未免有些重复了。　努尔特之王计划窃取夜间动物园的颜色，使动物处于极大的危险之中！而夜间动物园管理员威尔和他的朋友能拯救夜晚动物园吗？他见过张家和郑家人。漂亮的女孩陈平死在宁海市体育馆的更衣室，经警方鉴定，死者受到性侵犯致死。刑警队长徐雷认为看门人老北有重大嫌疑，审讯羁押老北期间，某大型商场发生相似案件，老北的作案嫌疑被排除后释放。经排查，警方对另一嫌疑人陆自立实施了抓捕。然而陆自立在刑事诉讼法庭上告知他是先天性性无能，不可能作案，被排除嫌疑……