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If a service needs to be public-oriented, it needs to provide a user access interface. These interfaces just give hackers the opportunity to take advantage of them. For example, the TCP/IP protocol handshake defect can be used to consume the link resources of the server, The stateless mechanism of UDP protocol can be used to forge a large number of UDP data packets to block communication channels... It can be said that the world of the Internet has not lacked attack points exploited by DDoS since its birth, from TCP/IP protocol mechanism to CC, DNS and NTP reflection attacks, and what's more, it uses various application vulnerabilities to launch more advanced and accurate attacks.　　随着日常的工作接触，尽管李莉对刘东毫无感觉，但刘东却已经暗暗地爱上了她。相貌英俊，性格豪爽的军分区参谋马刚来医院就诊，与李莉邂逅，两人一见钟情，相同的家庭背景让两个年轻人越走越近，很快就到了谈婚论嫁的地步。婚前旅行让两人收获了满怀的好心情，旅行照片中的甜蜜正在向他们招手。(2) Be able to skillfully use tools such as program operation flow and debugging;不单单是这样，齐相田荣很清楚当年自己因为楚国不杀田假一事，而并未率军救援定陶，坐视项梁被章邯围困从而死在战场上。照理说，严党一倒，最大的受益者必然是搞严党的人，可徐阶实在不像。这个段子，三年零两个月前出现的，可以使用，列入备选，等级e＋。