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SYN flooding attacks can attack with fewer packets than ordinary brute-force DoS attacks that only send a large number of packets to the target network. However, this requires some understanding of the server's operating system, such as how much backlog queue space it allocates and how long it will keep the TCB in the SYN-RECIEVED state before timeout and discarding the TCB. For example, an attacker can send a certain number of SYN packets that are exactly the size of the backlog queue, and their cycles are just the time when the TCB is recycled, thus making the server permanently unavailable.Return collection.get (pos);因为今天，项羽要在咸、阳宫召开朝会，分封诸侯。连双春（关咏荷饰）于南方小镇经营小酒家，因只懂得烹调“大排档”菜式，大婆汪若岚（米雪饰）又精神错乱，令小酒家生意欠佳。公元2110年，能源即将耗尽的地球满目疮痍，全人类面临灭顶之灾。千钧一发之际，一群勇敢的赛尔智能机器人登上赛尔号飞船，临危受命前往浩瀚宇宙寻找无尽能源。C per capita living expenses of urban residents;