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Enterprises must strive to predict the possible security threats to applications and network services and mitigate the consequences of these attacks by formulating security contingency plans.A TCP connection is a quad, and a connection is uniquely determined by the source IP, the source port, the destination IP and the destination port. Therefore, if C wants to forge the packet from A to B, it should fill in the above-mentioned IP header and TCP header with the source IP, source port, target IP and target port. Here B is the server, IP and port are open, A is the target we want to attack, IP certainly knows, but the source port of A is not clear, because it may be randomly generated by A. Of course, if we can find out the rule of generating source port for common OS such as Windows and Linux, we can still do it. In addition, we can step on the connection port of Car A through a large number of controlled hosts.这是个只有学历才能决定一个人的价值的世界。学力测验的合格，就意味着人生的成功。人们从幼小的时候就开始接受筛选，而只有优秀的人 才能得到幸福。在测验落选的人等着他们的，只有惨烈的人生。但是，虽然不会读书但就这样甘愿的接受不幸人生的人 是一个也没有的。为了让测验合格并留下优秀的成绩，人们可说是 不择手段。除了一定会有的作弊行为外，为了比他人取得更优秀的成绩 也有人在测验中进行妨害的行为。不知道从何时开始，变成只会读书的话是不可能合格的状况 测验的会场也变成了战场。 重视学力的L型人类（学习型）以及磨练作弊技巧的C型人类（作弊型）L型与C型的人组成搭挡、排除别人进行的妨害、然后朝着 拿高分的目标前进。为了防碍他人得到高分，C型的人之间不断的展开 热烈的战斗。再加上不允许作弊行为的监考官们的参战，测验的会场 变得愈来愈混沌。C型的主角“睦明”与L型的女主角“巧衣”一起华丽的突破测验、令人痛快的战斗物语。《TV动物农场》是SBS老牌动物专业节目，节目追求人与动物的真正的沟通。所以，赵敏比张无忌更加着急，去找谢逊和周芷若下落。一个不知天高地厚的高中生成为大企业的领导之后发生的一系列故事的浪漫喜剧。徐仁国在剧中饰演的角色是高中曲棍球队的主攻手，是该校最具人气的高中生。他将代替身为IT专家的哥哥成为某公司的企划室长，上演一系列曲折有趣的故事。The firewall sets the SYN forwarding timeout parameter (the firewall for state detection can be set in the state table), which is much less than the timeout time of the server. When the client sends the SYN packet and the server sends the acknowledgement packet (SYN + ACK), if the firewall has not received the acknowledgement packet (ACK) from the client by the time the counter expires, it sends the RST packet to the server to cause the server to delete the half connection from the queue. It is worth noting that the setting of gateway timeout parameters should not be too small or too large. If the setting of timeout parameters is too small, it will affect normal communication. If the setting is too large, it will also affect the effect of preventing SYN attacks. This parameter must be set according to the network application environment.