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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.虞子期摇头道：想来吴芮也是惧怕我国兵锋，一直悄无声息，没有任何的举动。等回到桃花谷后山，碰见张宅的下人，说枣子已经摘完了，板栗便赶忙要回家。Source: MDT Online黑子呜咽一声倒地。860010-1107020600If CSO's of major banks in the country are asked about distributed denial of service attacks (DDoS) they have encountered in recent months, they will certainly keep their mouths shut. Yes, silence is the first choice for security personnel.