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The event distribution mechanism is the distribution of clicking events.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.五百年前，曾经出现过一场惊心动魂的人僵大战，一众明朝锦衣卫力战不明来历、杀人如麻的僵尸。其时战况何其激烈，外人不得而知，但重要的是，当年多位奋不顾身的宫中高手，竟然活到现在……Nine: Understanding Publish-Subscription Mode in Javascript汪魁愣了好一会，才高兴地挠挠头皮。吕嬃道：可是已经过去这么长时间了，做做样子也该够了，可是现在依旧管在大牢里，怕是……您知道的，以我们家樊哙的脾气，这比杀他还要难受。