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In TCP protocol, messages arriving at the destination will enter the buffer of the TCP stack and will not be forwarded to the receiving system until the buffer is full. This is to minimize the number of times the system empties the buffer. However, the sender can force the receiving system to clear the contents of the buffer by sending a TCP message with a PSH flag of 1. The TCP PUSH + ACK attack, like the TCP SYN attack, aims to deplete the resources of the victim system. When an attacker sends TCP messages with PSH and ACK flags set to 1 to the Target host, these messages will cause the Target system to clear all TCP buffers (whether the buffers are full or not) and respond with an acknowledgement message. If this process is performed by a large number of controlled hosts, the system will not be able to process normal data, resulting in denial of service.板栗跟在香荽身后，眼不错地盯着妹妹。　　以此为契机，汤姆和杰瑞这对百年冤家再次碰面，展开连番惊险刺激而妙趣横生的恶斗…尹旭点头道：很好。　　兰顿教授发现这一连串的线索原来有着令人震惊的关联：已故的馆长是锡安隐修会的成员 －锡安隐修会是一个真实存在的秘密组织，其中成员包括牛顿、波提切利 (Botticelli, Sandro)、雨果和达芬奇等人。至此兰顿才发现自己正在追踪一个石破天惊的历史大秘密，一个已经埋藏了几个世纪、既富启发性又危险的秘密。在这场遍及巴黎、伦敦和苏格兰的追逐中，兰顿和苏菲发现自己正在跟一个从来不肯露面的幕后主脑斗智斗力，这个人似乎总是知道他们下一步要做什么。除非他们可以解开这个错纵复杂的谜团，否则一个埋藏了二千年的秘密、一个极爆炸性的古老真相，将永远消失，而他俩的性命亦会危在旦夕…