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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.　　《深度对话》：未来，某所精神病医院正在进行一项关于精神分裂的研究。四位参与者投入忘我表演，已然分不清真正身份，到底谁是医生？谁是病人？　　学古典音乐的孟晓星（陈奕迅 饰）遇见大提琴手林霏（顾绍华 饰），随即被其高雅的气质所吸引，但林霏不为所动。林父（濮存昕 饰）对女儿宣布再婚，失意的林霏到酒吧借酒浇愁，不料酒中被人下药，糊里糊涂与晓星发生了关系，数日后被医院查出己患爱滋，室友得知后逃也似的搬离。晓星知道林霏的病是他所传染后异常悔恨，但他体检的结果却是HIV呈阴性，为了安慰林霏，他没有将真相告诉她。林父为给女儿筹集治疗费，增加了一份兼职工作。其实真正把病传染给林霏的是与之有过一夜情的高强（徐僧 饰），而高强却认为是林霏害了自己......永井圭（宫野真守 配音）是一位平凡的少年，拥有高超的智商和优秀的成绩，某日，在一场交通事故中，永井圭不幸丧生，随后变为亚人，遭到了军方的通缉。在童年好友海斗（细谷佳正 配音）的帮助下，永井圭踏上了逃亡的旅途，期间遇到了身份神秘的帽子男佐藤（大冢芳忠 配音），虽然佐藤和永井圭同为亚人，但不知为何，佐藤将永井圭视为了敌人。2) Divide line segments equally. Right-click Segment Split to enter the required number of segments in the value box in the lower right corner.这是你的男朋友？许岚你不是一直很高傲吗？我看你交的男朋友也不咋样。