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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.For the advantages we mentioned, the second point is that we can understand the virtual agent below. The virtual agent is used to control access to the ontology with high creation cost. It will postpone the instantiation of the ontology until a method is called. For example, if the instantiation of an object is very slow now, it cannot be completed immediately when the web page is loaded. We can create a virtual agent for it and let it postpone the instance of the object until it is needed.The network cable is the transmission medium. A computer can correspond to multiple IP addresses. In fact, the network card interface of a computer corresponds to one IP address. If the computer has two network cards, then the computer can have two IP addresses!The above machine is limited to recharging Manaka and cannot sell subway tickets or Manaka. It is still very convenient to recharge.4. Jin Jide(can be superimposed)忽觉这话有些不妥，忙抬头对小葱道，今晚好些好吃的，喝点素菜汤也好。