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The scheming bitch in the eyes of othersAlthough it can weaken the connection between objects, if it is overused, it will make the code difficult to understand and maintain, etc.腊月二十五成亲，好些事都要准备哩。This leads to an obvious potential DoS attack. Incoming SYN packets will be allocated too many TCB and the host's kernel memory will be exhausted. In order to avoid this memory depletion, the operating system usually associates a "backlog" queue parameter with the listening interface, which maintains both the upper TCB number of connections and the SYN-RECEIVED state. Although this scheme protects the host's available memory from attack, the backlog queue itself brings a (small) source of attack. When there is no space in the backlog, it is impossible to respond to new connection requests unless the TCB can be recycled or removed from the SYN-RECIEVE state.齐国这边的事情比较关键。8280 +706 +400 +500 = 9886