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DDOS attacks mainly occur in the network layer. Its most obvious characteristic is to send a large number of attack packets, consume network bandwidth resources and affect normal users' access. At present, the detection and defense technology for DDOS attacks in the network layer is quite mature, and at the same time, some new attack methods-DDOS attacks in the application layer have emerged. Different from network layer DDOS attacks, application layer DDOS attacks mostly imitate the access behavior of legitimate users and will not generate a large number of attack data packets during data transmission, but they will consume server resources through a large number of database queries and other operations, which is more difficult to detect. According to the different attack modes, DDOS attacks include reflection amplification attacks in addition to ordinary flooding attacks. This type of attack often uses a legitimate server as a reflector, which sends a large number of data packets to the target, thus causing greater harm. At present, DDOS attacks against DNS servers are also common. Attackers often send fake domain names to DNS servers, consuming DNS server resources. At the same time, due to the recursive query mechanism in DNS servers, DDOS attacks against DNS servers have a large impact range.该电影以两名陷进“危险游戏”（如对路人进行无差别的暴力攻击）的青年的故事为主轴，以群像剧的方式刻画了年轻人的欲望与癫狂。1931年夏，从西山女中毕业的林道静为了追求自由，选择了抗婚出逃，走投无路的她觉得天下之大却没有她的容身之所，茫然之下想要投海自尽，被大学生余永泽救回。热情而多才的余永泽一下子感动了林道静。在北平，林道静结识了进步学生、共产党员卢嘉川、江华等人，明白了许多革命救国的道理。而在这些问题上，余永泽却和自己有着截然不同的观点。在一次学生运动中，卢嘉川因为余永泽的不肯帮助而遭到被捕。林道静毅然离开了余永泽，加入到了风起云涌的爱国学生运动中。当局一次次的陷害和逮捕让林道静成长为一名成熟的学生运动领袖。在又一次的爱国游行运动中，林道静走在队伍的最前列。古老的中华大地，回荡着这代青年用鲜血和生命谱写的青春之歌。鞭炮震响了平静的小镇，原来李家的独子兴旺从国外农耕队回来了，亲戚朋友都来向兴旺的寡母王兰及妻子喜鹊恭喜。兴旺抵家时，寡母王兰含泪抱着这个独子，三年多前，这个独子被派出国工作，她天天祈求老天保佑，如今兴旺总算平安回来。兴旺看着一边流着欢喜泪的妻子喜鹊，还有那离开才刚生下的儿子大头─李明德，如今会走路了，心中百感交集。一旁的喜鹊，心中更是欣慰无法形容，在亲友祝贺中，大家欢喜的吃着这顿饭,只有开杂货店的田丰，虽然笑在脸上，却难掩失望之情。夜里,登财特来邀约兴旺至小吃店饮酒,没想到兴旺酒醉不慎摔落水沟身亡。王兰自儿子死后深居简出，心思全在孙子明德的身上。喜鹊在外常受讥讽和调戏，幸田丰时常解围，并常送日常用品给李家，反遭王兰恶言相待，王兰常数落喜鹊不是，并不让喜鹊接近长孙，一日，喜鹊工作回家途中不支昏倒，医生验出喜鹊有三个月的身孕。王兰怒打喜鹊，怀疑她与田丰有奸情，喜鹊惊慌地再三辩解，她想起，是不是兴旺回来的那一夜兰不信有如此巧的事，坚决要喜鹊拿掉这个遗腹子，喜鹊坚持不肯，终生下二子李明仁。二十年Later, she changed her mind, saying that she had two miscarriages in 2003 and 2008. She pretended to be pregnant and used her colleague's baby ultrasound images to deceive her husband. 　　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.嘉靖凛然起身，基本的再见也没有说，就此拂袖进了卧房。