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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.Three, point to notify the following "information";张槐和郑氏对视一眼，摸摸他脑袋，小声道：别瞎说。Zhao Mucheng finished, silent.总而言之，他是一个欺诈师，心理学家，侦探，魔法师，音乐家，一个孤独的人本剧描写近未来的一家人琐碎的日常。未来（NON 饰）每天穿着运动衫在家里打游戏，自称是革命者，梦想构筑人类需要工作的未来。而父亲古吉（槙田雄司 饰）则是固执的保守派，两人总因为工作的事争吵。妈妈今子（堀内敬子 饰）与单纯可爱的机器人kotaro总是温柔地守护着一家人。哥哥友郎（本乡奏多饰）是一个科研者，他相信并支持妹妹的理想，发明了一堆先进道具，然而未来却滥用道具，惹出了一出出闹剧。电视剧向《天河魔剑录》小说输出人气，但是这部分人气很快又转向了《笑傲江湖》。