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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.We use the global publish-subscribe object encapsulated above to realize the communication problem between the two modules. For example, there is now a page with a button. After clicking this button each time, the DIV will display the total number of clicks on this button. The following code:他在信中十分惭愧地跟大伯和大伯母请罪，说他一定会照顾弟弟的，绝不让他被人欺负，除非他死。三位生活在不同年代的女性：60年代的家庭主妇，80年代的社交名媛和2018年的律师，处理着婚姻中的不忠行为。何心隐直言道，徐阶希望我们给罗龙文写一封官方书信，里面表露清楚他与我们勾结，准备同严世藩一同出海相投，然后让这封信正好被官府抓到。挡住射来的箭矢，翻山虎脸色也有些发白。杨长帆朝天大笑，我杭州都烧得。