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How to improve the classification ability? Apart from practicing and thinking more, I think the core is two points:哈哈。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.那指挥使很诧异，说李县令公事尚未完结，还要在京城呆两天，刚才不过是送他们出城而已。若是留在这里，危险无疑会成倍的增加。黄英姑（薛家燕）生性乐观，与女儿孙敏华（汪琳）等一家人自给自足。英与邻居王志祥（许绍雄）交情甚笃，其子王剑（吴启华）更把英当作再生母亲看待。时下的香港贪污盛行，在摊档工作的英因欠债，偶然会替人当替死鬼做偿还，坐数日监。一次，英不知就里，便一口气答应当替死鬼，结果被人屈成杀人犯，判以死刑。英行刑剪下辫子，吩咐当狱警的祥将之交给华做纪念。英死后冤魂附在辫子上，却因辫子落在装有关公像的证物房里无法出来，一困十数年……一位母亲Mat早年丧偶后被迫独力抚养自己的儿子Tan。在此期间，Mat得到了Watt，一个爱上她很久的人的帮忙。Tan被期望成为像他父亲那样的人，但实际上，他希望远离其觉得范围狭小的母亲的世界。 当他遇到了June，他的梦想就要成真了，June有着自由精神，知道自己想要什么样的生活。这位年轻女子迅速弥补了Tan所感觉到的缺失，并在其过程之中帮助他修补了其与母亲的关系。