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If the connection initiator is legal, the firewall/proxy will receive the ACK, then establish a connection between itself and the server and disguise the address of the connection initiator. The firewall/proxy separates the two sides of the connection. This segmentation can resist SYN flooding attacks because the server has not accepted SYN from the attacker at all. As long as the firewall/agent implements some TCP-based defense policies, such as SYN? Cookies or SYN? Cache, he can protect all servers behind him from SYN flooding attacks.在一个名叫特尼镇的所在，鸟语花香，草木清新，生活富足，只是这些都是表面的假象，所有的树木都由人工材料做成，并通过电脑和电力维持运作。虽然空气质量糟糕，可是当地的人民乐于享受这便利的现代化生活，更何况有欧海尔先生（Rob Riggle 配音）为他们提供新鲜的桶装空气呢！小青年泰德（扎克·埃夫隆 Zac Efron 配音）暗恋美丽的姑娘奥黛丽（泰勒·史薇芙特 Taylor Swift 配音），为了帮助女孩实现见到真正树木的梦想，他铤而走险离开特尼镇，来到满目疮痍、阴霾污浊的外部世界寻找传说中知晓关于树木一切信息的老万。从老万口中，泰德了解到这个曾经的成功商人以及当初棉花树满布的乐园变成荒山的全过程。乐土从此一去不返，除非……显然，郭寒早就加盟星海。绍给朋友们，哄闹声中陈重抬头，发现站在面前的竟然是叶梅！