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(5) Number, position and dynamics of ships detected by radar;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.上世纪二三十年代的内蒙古科尔沁草原上，蒙汉各族人过着幸福和睦的生活，美丽的姑娘牡丹送别奉王爷之命到外地办事的心上人嘎达。但嘎达在办事途中遭袭，幸被一赶路的汉子救下。嘎达回到王爷身边后，突然有刺客来袭，嘎达挺身救下王爷，被提升为骑兵统领——梅林。但在与刺客搏斗中，嘎达认出刺客是救过他的汉子，遂将他放走。军阀收买王爷割让草原，嘎达梅林奉王爷之命将牧民逐出，一位白发苍苍的老妈妈狠狠地打了嘎达一个耳光，令他的心阵阵刺痛。　　战争之下，繁华落尽。帮派大佬逃亡香港，交际花不知所踪，日本妹夫死在上海，电影皇后被丈夫抛弃，处男遇上妓女，姨太太杀死二哥。战争惨烈，战争终于结束。他轻易选择沉默，因为伤口无法弥合。罗曼蒂克消亡史。被浪费的时光。旺与母亲秀莲，相依为命。因旺自少被人嫌弃，只有邻居女孩黄奇凤接受他，二人青梅竹马。旺为帮助凤出国升学，把莲替自己储起的“老婆本”送给凤，而且一厢情愿，守候凤学成归来做自己的老婆仔。庞取义表情那叫一个激动，振振有词道，多几门铳，弟兄们跟倭寇打起来也多几分依仗。