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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.In addition to SYN flooding, some other attacks by disguising the source IP address and connection parameters in TCP established connections are also possible. If an attacker can infer the IP address, TCP port number and legitimate sequence number of both parties, he can destroy the connection by resetting or modifying malicious data. In addition to camouflaging TCP segments, camouflaging ICMP packets can also terminate a TCP connection.黑胖子点过头后，语气客气了一些，代我向杨举人问好。　　《将夜》终将至，花开彼岸天。Iptables are more complicated and I am not very good at using them. It has certain influence on server performance and cannot prevent large-scale attacks.罗立夏天资聪颖，大学期间一直属于学霸级人物，出国留学毕业后在外创业，就在他以为登上人生巅峰，创业成功受到万众瞩目之时，却被合伙人陷害，一下跌入人生谷底。回国后罗立夏重燃创业之心，在几个小伙伴与政府的帮助下从零开始经历磨难和挫折后，迅速成长为新一代的创业领导者。有时候尹旭常常在感叹，自己的运气何等的好，蒲俊和苏角手握重兵而无一点异心。