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二楼说得太好了。Skiing includes cross-country skiing, ski jumping, alpine skiing, Nordic skiing and freestyle skiing.The attacker first completes the three-way handshake to establish the connection, but in the last ACK reply of the three-way handshake, the TCP window size is set to 0, and then a data request is made. When the attack target sends the request result to the attacker, it stops the data transmission when it finds that the TCP window size is 0, and sends out a TCP window detection packet to ask the attacker if the TCP window has been updated. Since the attacker will not update the window size, the attack target will always maintain the TCP connection and wait for the data to be sent, and continuously carry out TCP window size detection. When the number of controlled hosts in the botnet is large, Target's connection table will gradually be exhausted, resulting in denial of service.1.2 Launch and amplify attacksThere was a man in his heart, even if they had nothing to do with each other.In November 1998, a Chinese ocean-going ship "Changsheng" went to sea for three days and mysteriously disappeared. All communication was cut off and the lives of 23 Chinese sailors were unknown. Within 10 days, a large-scale search operation traveled all over the world from Southeast Asia to Greece to the United States, but the huge ship evaporated without a trace.1. When ships are in mutual view, when the navigating motor ship permits or requires manoeuvring in accordance with the terms of these Rules, the following sound signals shall be issued by the whistle to indicate it: