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[ON COMPLETION [NOT] PRESERVE]: optional; default is ON COMPLETION NOT PRESERVE, that is, the event will be dropped automatically after the execution of the planned task is completed; ON COMPLETION PRESERVE will not drop.在他身后，站着一身白衣的王穷。她矜持的、默默的、冷静的面对张无忌，不断压抑自己。What is Health Daily?If an attacker sends SYN packets quickly with their own undisguised IP address, this is a so-called direct attack. This attack is very easy to implement because it does not involve spoofing or modifying packets below the user layer of the attacker's operating system. For example, he can simply send many TCP connection requests to implement this attack. However, for this attack to work, the attacker must also prevent his system from responding to SYN-ACK packets because of any ACK, RST, or ICMP (Internet? Control? Message? Protocol) will cause the server to skip the SYN-RECEIVED state (go to the next state) and remove the TCB (because the connection has been successfully established or recycled). Attackers can do this by setting firewall rules, causing the firewall to block all packets (except SYN) to reach the server, or causing the firewall to block all incoming packets so that SYN-ACK packets are discarded before reaching the local TCP handler.Focus 1. Level 2 is calculated only on the basis of Level 1After the report was issued, it caused a shock in the securities industry and the securities and communication companies. Many people in the securities industry have given positive feedback such as truthfulness, objectivity and insight. It is understood that the management of the Securities and Communications Company also held an emergency meeting on the day the report was published, and contacted reporters through public relations companies to communicate and delete the manuscript, but did not raise any objection to the authenticity and accuracy of the manuscript report.