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In the case of a reflection attack, An attacker uses a controlled host to send a large number of packets, What makes these packets special is that, The destination IP address points to the server, router, and other facilities that act as reflectors, while the source IP address is forged as the target IP address, When the reflector receives the data packet, it will think whether the data packet is requested by the attack target, so it will send the corresponding data to the attack target. When a large number of response data packets flock to the attack target, it will deplete the network broadband resources of the target, resulting in denial of service attacks.The fundamental reason for using design patterns is to adapt to changes, improve code reuse rate, and make software more maintainable and scalable. In addition, the following principles should be followed when designing: single responsibility principle, open and closed principle, Richter substitution principle, dependency inversion principle, interface isolation principle, composite reuse principle and Dimit principle. Each design principle is described below.等你们演完了，我们再说故事。所以比起在女人身上驰骋，他更希望能遇到一个能压在他身上的高大男人，哪怕是势均力敌也好过被女人柔软的腰肢所攀附中土最后一座矮人王国埃尔波尔，巍峨壮丽，庄严雄伟。老国王索尔积聚大量财富，却引来恶龙史茅革的觊觎和荼毒，最终导致这座城池陷落。许多年后，灰袍巫师甘道夫（伊恩·麦凯伦 Ian McKellen 饰）找到弗罗多的舅舅——霍比特人比尔博·巴金斯（马丁·弗里曼 Martin John C. Freeman 饰），邀请他加入由13名矮人组成的远征队伍。原来史茅革已多年不见声息，背负家国仇恨的矮人王子索林（理查德·阿米蒂奇 Richard Armitage 饰）希望借此机会收复故土。经过一番考虑，巴金斯决定加入。令他想不到的是，远征旅途多灾多难，与索林结下深仇大恨的苍白半兽人及其爪牙阴魂不散，更有食人鬼和石人制造的无数艰险。而在旅途中，巴金斯也意外得到了日后影响整个中土的重要宝物……　这样一个画面定格在每一个人心头，山洞中鸦雀无声，众人一时间都忘了喝彩。