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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.Return collection.get (pos);那是在极限世界战斗的人们的羁绊的故事杨长帆勾了下女儿的鼻子。是逃脱，还是同流合污，他面临着痛苦而危险的选择……Using monomer mode can make the code organization more consistent and make the code easy to read and maintain.