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SYN attack is a kind of DOS attack. It takes advantage of TCP protocol defects and consumes CPU and memory resources by sending a large number of semi-connection requests. SYN attacks can not only affect hosts, but also harm network systems such as routers and firewalls. In fact, SYN attacks can be implemented as long as these systems turn on TCP services no matter what systems are targeted. As can be seen from the above figure, the server receives the connection request (syn=j), adds this information to the unconnected queue, and sends the request packet to the client (syn=k, ack=j+1), then enters the SYN_RECV state. When the server does not receive an acknowledgement packet from the client, it retransmits the request packet and does not delete this entry from the non-connection queue until the timeout. With IP spoofing, SYN attacks can achieve good results, Typically, clients forge a large number of non-existent IP addresses in a short period of time, SYN packets are continuously sent to the server, and the server replies to the confirmation packets and waits for the confirmation of the customer. Since the source address does not exist, the server needs to continuously resend until it timeout. These forged SYN packets will occupy the unconnected queue for a long time, normal SYN requests will be discarded, the target system will run slowly, and in serious cases, the network will be blocked or even the system will be paralyzed.曾经的拳王遭到陷害，在比赛场上打死了对手。后来被判入狱，好不容易出来后，却不敢和自己亲生女儿相认。在当地做了一个保安，陪伴在女儿身边，没想到女儿居然做起了扒手和小偷的勾当。他装作朋友的身份接近她，给她指引。却发现她陷入一场毒品相关的事件中，拳王为拯救女儿，独闯龙潭。Father Brown（Mark Williams饰演，他是哈利珀特系列里的 Arthur Weasley 英国喜剧演员，编剧和主持人） 是切斯特顿笔下的著名侦探，矮个子，圆脑袋，身材胖儿可爱。手边常有一把标志性的大雨伞，他天性怕羞，说话有些结巴，看起来憨厚纯真，似乎与探案不搭边，却大智若愚，有着很锐利的直觉。　　そして、　　严泽坤在抗战后回到台湾，却发现曾经的恋人日本女孩雅子（长泽雅美 饰）已经被遣返回日本。佟大庆则爱上了白天做护士照顾伤兵，晚上在街头招客的妓女于真（章子怡 饰），两人原本各取所需照了张“结婚照”，没想到真的成了一对苦恋的情侣。"Yes, Common carnivores, Whether it's a dog, Wolf, or the dog teeth of lion and tiger, They are all tapered sections, With a tip in the front, But this kind of thing is different, All of their teeth are the same, All of them are inverted triangles, And very thin, Both sides are like knives, It was all 'open-edged'. It was very sharp and very hard. When I pried its mouth with a dagger at that time, after priing it open, I could find many thin but obvious scratches on the blade of the dagger in the face of the sun. The dagger I used was made of steel. It was really surprising to me that the teeth could leave such marks on it. "Zhao Mingkai said.