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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.On another occasion, he also acted as a mentally retarded person. When school was over, because Lin Nian was a "garbage bug", the teacher asked him to take out the garbage, but Lin Nian actually said, "Teacher, I am a two-year-old 'little BB', so I can't take out the garbage yet." The whole class burst out laughing.1951年，大漠如烟。人民解放军剿匪部队与残存的国民党兵匪在沙漠中摆下别样的战场，颗颗子弹带看仇恨射向面目狰狞的敌人。通过激烈的战斗，除了匪首金冶中及两个匪兵逃脱外其他敌人全部被歼灭，打扫完战场，负伤的班长钟永胜带着战士李玉根和小姜继续沿着敌人马蹄留下的痕迹追击。天公不作美，陡然的狂风吹消了沙漠上一切痕迹，敌人朝哪个方向逃走了呢？诸葛亮会后，他们兵分三路追击。小姜最先追上匪首并毙敌军马和一个匪兵，而自已也负伤，幸亏钟永胜和李玉根及时赶到，继续追击未路之敌。他们在水站旁击毙了另一名匪徒，金冶中又逃脱了。钟永胜的伤势由于得不到治疔，在干旱的沙漠里急剧恶化，不幸牺牲。李玉根和小姜泪目相望，发誓要给班长报仇.一九三五年前后，日本帝国主义加强了对我国的侵略。在民族危机空前严重的关头，蒋介石仍旧坚持“攘外必先安内”政策，张学良将军被迫“剿共”，因在陕北战场上屡遭失败，受到蒋介石的责难，于是急于寻求出路。张学良通过被我军放回的原东北军团长高福源的关系，与我党周恩来同志在延安举行了会谈。张将军决定以民族存亡的大局来说服蒋介石停止内战，一致抗日。与此同时，杨虎城收到了毛主席派人给他送来的亲笔信。一九三六年十二月初，蒋介石亲临西安，下榻于临潼华清池，张学良多次对蒋“苦谏”，均痛遭拒绝。张、杨被迫于一九三六年十二月十二日对蒋实行了“兵谏”，爆发了震惊中外的“西安事变”。“西安事变”和平解决，抗日战争也进入了崭新阶段。Typical flow of the synchronous non-blocking I/O model该剧以孤独症作为整部作品的中心议题，讲述了一个普通平凡的23岁女孩葡萄，在母亲病逝之后，独自带着患有孤独症的哥哥袁望，坚韧不拔、踽踽而行的生存故事。