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.
一向沉着的蒯丞相也是脸色数遍，惊疑不定。
舒羽十几年前由北京到英国读书时，认识了罗大为后嫁到了香港，他凭着自身的努力，开创了一家网络公司，但其丈夫罗大为在偶遇大陆新移民黄小曼后竟发生了关系。舒羽倍感苦闷，幸结实了梅萱为友，并巧遇自己的旧同学刘潇。
2. Distributed Denial of Service is divided into attack network bandwidth resources, attack system resources and attack application resources
Independent Attack +11
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(12.20 update)
