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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.秦淼听了困惑不已。秦汉时期，王宫大殿往往都修建在高台之上，为的就是要一种高度和恢弘庞大，从而体现王者的气势与威严。一个女神级的御姐，在朋友圈儿找到了“命中注定”的那个灵魂伴侣，本以为这是最温暖的恋人，最感人的故事，最浪漫的爱情……然而，最后却是最惊悚的反转结局！2. Please turn off the iPhone now, and then you will hear the prompt that the computer is not connected successfully.The second method: recovery in case of key failure他并未往深里说。