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If an attacker sends SYN packets quickly with their own undisguised IP address, this is a so-called direct attack. This attack is very easy to implement because it does not involve spoofing or modifying packets below the user layer of the attacker's operating system. For example, he can simply send many TCP connection requests to implement this attack. However, for this attack to work, the attacker must also prevent his system from responding to SYN-ACK packets because of any ACK, RST, or ICMP (Internet? Control? Message? Protocol) will cause the server to skip the SYN-RECEIVED state (go to the next state) and remove the TCB (because the connection has been successfully established or recycled). Attackers can do this by setting firewall rules, causing the firewall to block all packets (except SYN) to reach the server, or causing the firewall to block all incoming packets so that SYN-ACK packets are discarded before reaching the local TCP handler.西游记讲述仙界一只由仙石生出的猴子拜倒菩提门下，取名孙悟空，苦练成一身法术，却因醉酒闯下大祸，被如来佛祖压于五行山下。五百年后，如来说法，观音访僧，观音向孙悟空道出自救的方法，他须随唐三藏到西方取经，作其徒弟，修成正果之日便得救。孙悟空遂紧随唐三藏上路，途中屡遇妖魔鬼怪，二人与猪八戒、沙僧等合力对付，展开一段艰辛的取西经之旅。西游记以丰富瑰奇的想象描写了师徒四众在迢遥的西方途上和穷山恶水冒险斗争的历程，并将所经历的千难万险形象化为妖魔鬼怪所设置的八十一难，以动物幻化的有情的精怪生动地表现了无情的山川的险阻，并以降妖服怪歌赞了取经人排除艰难的战斗精神。See the JavaScript addEventListener () section for both approaches.战争是国策的最好表达方式，这比嘴上说的东西管用多了。Alin Sumarwata饰演Gracie Novin，聪明﹑真诚﹑诚实到率直的她是队伍的灵魂所在；Daniel MacPherson饰演Samuel Wyatt，酒吧哲学家的他是个独狼，幷没有与别人组队的打算。Roxanne McKee饰演来自军人家庭的Natalie Reynolds，擅长心理侧写及找寻对手弱点，不过她可能对自己的错误懵然不知；Warren Brown饰演绰号Mac的Daniel Macallister，守信用﹑友好﹑强壮的他，是在为自己失去的队友报复而战。