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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.? Output: this is mailsender!动画《JOJO的奇妙冒险石奥妙》的第13话～第24话将于2022年秋天在Netflix上发布全球独家先行配信。电视广播也将于2022年内开始。同时，新PV和新的视觉图也公开了。(7) Having engaged in at least 20 maintenance and testing activities of fire fighting facilities for industrial buildings and civil buildings with a single building area of more than 20,000 square meters equipped with automatic fire fighting facilities in the three years prior to the date of application;入乡随俗，古代认为生产血腥不吉利，不让男子进入，尹旭也无可奈何。"So, the death rate of this flying insect is quite high, have you been stung? Did your protective gear play a role in resisting their attacks?" I asked.Grape variety