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FLAG_ACTIVITY_SINGLE_TOP: also equivalent to singleTop configured in mainfest;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.因此，他不认为祖宗会舍不得一块饼。4? Distributed attack100,000 Yuan Zhang Dongqing [Investigation] Hongte Precision's 100-fold Increase: Group Loan Network and Mysterious Funds Behind It (Has Been Off Line)南宋年间，宋高宗听信秦桧的谗言，以莫须有的罪名杀害岳飞，韩世忠辞官。秦桧结党营私，只手遮天，令亲者痛，仇者快。多名前朝元老聚合民间资源，组成“豪侠”，结合多名武林中奇能异士，与秦桧对抗，但第一笔巨款，在托运时竟然失踪。押运巨款的“豪侠”，全数遇害……When the invariant and variable behaviors are mixed together in the subclass implementation of the method, the invariant behaviors will repeat in the subclass. We move these behaviors to a single place through the template method pattern.