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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.When the soul is changed to the Q key, Jiaolong Zhenhai's bully body is very useful for Blood River T, and there is also the mocking skill of bully horizontal bar.[Dialogue with Wang Fengya's Mother of Eye Cancer Girl: Volunteers Say They Have to Go to Beijing for Treatment with Their Money]Exclusive title award (monthly award for reaching the corresponding charm level)周三太爷也笑眯眯的，像只狡猾的老狐狸，道：就怕我们去晚了，你四叔已经定下王家大少爷了。However, online organizations are also facing many challenges at this stage.《倚天屠龙记》的第二章到了这里结束，这一期的连载也到此结束。