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Facing TCP's three-way handshake protocol, how should attackers launch attacks? The attacker first intentionally initiated a handshake packet. After receiving it, the server puts it into the waiting queue and returns an acknowledgement. Secondly, the attacker will no longer send the third acknowledgement packet, thus the server will make multiple retransmissions (the Linux system configures the number of retransmissions through tcp_synack_retries), consuming a lot of extra overhead, and the waiting queue will be occupied, even the waiting queue will be full, eventually causing the server to be unable to receive the client's request. This is the attack.《乐可音乐+》三维动画时尚新儿歌是国内时尚亲子互动儿歌颠覆者，融合歌谣、运动、亲子、韵律、认知等元素，主打亲子互动概念，同时满足音乐韵律启蒙、认知学习及家庭亲子互动需求。乐可音乐+开心大串烧以系列形式放送给大家。嗯，挺有趣的。2013-06-01 to 2013-06-06[Investigation] Behind the Scenes of China's Crude Oil Spot Trading: Grey Crude Oil Futures Market Not Exiting