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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.鲁三见红椒心情好了起来，也放心了。This is the basis of the opening and closing principle, and the specific content: interface-oriented programming, relying on abstraction rather than concreteness. When a specific class is used when writing code, it does not interact with the specific class, but interacts with the upper interface of the specific class.该剧讲述了大清第一才女年姝媛与四阿哥以及太子胤礽三人之间爱恨纠葛的情感故事。CBS宣布续订《海军罪案调查处》第18季。《太祖王建》，韩国电视剧，讲述高丽太祖王建在位时的事迹。他原是后高句丽建国者弓裔的将领，家族是朝鲜半岛西南岸专门作贸易和商业活动的豪族，在9世纪末到10世纪初，在朝鲜分裂和混乱达到极点，国家统一成为燃眉之急的课题。由于当时摩震国的国家领导人弓裔施行暴政，朝鲜人民怨声载道，王建趁机和几个志同道合的臣子一起于公元918年发动政变，驱逐弓裔，建立了新的王朝，并定都于开京，把国名定为高丽。后来在公元935年4月吞并新罗及公元936年9月吞并百济，实现了国家的统一。　　政宇看到在意大利的任务搭档是惠仁后大吃一惊。在豪华的宅邸举行的派对上，身穿华丽礼服的惠仁走进宅邸。政宇轻松打倒在屋顶上监视的警卫人员，成功在派对现场和惠仁会合。惠仁慢慢接近目标，正当作战计划即将成功时，被对方警卫员察觉，对方开始追击惠仁和政宇。