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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.Application software is a variety of programs that are user-oriented and written to solve practical problems. It can be written by users themselves or purchased. For example, we often use office software Office XP, drawing software Photoshop, game software Red Alert and so on.　　这是护宝与夺宝的故事。当弱小的盾面对强大的矛，会怎样？At this time, returning to "Other Power Settings", you can see that there is an additional "Excellent Performance" mode in the options.五大黑帮大角斗,警方政界多人牵涉其中，秦越桂港。毒品国际通道实景拍摄,首部好莱坞3D感念制作,海归新锐导演颠覆警匪老模式，数月围博毒首离奇死亡,新局长又微服被殴,引出个黑帮血拼.打毒扫黑看似顺利,警方被巧妙利用,400公斤的海洛因在警方的护送下顺利通关，1亿8千公款流失更令政治压力如影随形。面对蓄谋10年的复仇计划,腥风血雨无法遏制，"Lack" of Natural Talent//273沈曼婷从不觉得一定要女儿们嫁的富贵才是好生活，但她却无论如何也没想到，女儿们却一个一个或被动或主动地掉进或跳进那一扇金光灿烂的光耀门庭里。看着女儿们在表面光鲜的豪门中心内却压抑痛苦，沈曼婷却帮不到她们，甚至还因女儿们的选择不得不自己再次面对多年前的梦魇。玉欢其实是沈曼婷与当年情人林志成所生的女儿，未曾想二女儿玉璇却偏巧嫁给了林志成的独子林淼。实际上玉璇并非沈曼婷亲生，却正是林家女主人邵志红亲生，这一桩孽缘官司就足够让当事人崩塌了的。而玉欢则爱上与林家既是对手又有渊源的金家大公子金天桥，在商场上两家不可避免的针锋相对和尔虞我诈，彼此却有牵绊连连。在国外读书的小女儿玉琪，又因为不爱那专业更爱表演而回国发展，就这么着结识了金家二公子金天胜。金天胜藏匿富家身份，只做着喜爱的摄影工作时，哪知父亲却在用金钱诱惑着自己的女朋友。玉琪虽机智聪明，免于被潜规则，但日后终于与未来公公见面时，亦不免大尴其尬。玉琪后来因与天胜的误会而导致车祸毁容。只是所幸又因天胜而坚持而重生。