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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.秦旷忙道：就在这里用膳，都安排好了。小葱解开一个咸肉粽子，咬了一口吃了，赞道：大舅母家的粽子好吃一些，比我家的好。爱丽丝又打了一个饱嗝。设定在全世界拥有超过50亿用户的虚拟网络世界《U》，主人公“铃”是生活在乡下的17岁高中女生，年幼丧母，并留下心理创伤。曾经喜欢和母亲一起唱歌的她，也变得不再开口歌唱，而在与父亲的日常相处中也渐生隔阂。某一日她接触到另一个世界——虚拟世界《U》，并以“BELL”之名参与了进去。当铃(BELL)在《U》中再度开口唱歌，并将自己创作的歌曲发布之后，她收获了巨大的人气。而这时，《U》里令人恐惧的谜之存在，以龙之形态出现在了她的面前……