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The SYN-Flood attack is currently the most common DDoS attack on the network, It is also the most classic denial of service attack. It takes advantage of a defect in the implementation of TCP protocol. By sending a large number of attack messages with forged source addresses to the ports where the network service is located, it may cause the half-open connection queue in the target server to be full, thus preventing other legitimate users from accessing. This kind of attack was discovered as early as 1996, but it still shows great vitality. Many operating systems, even firewalls and routers, cannot effectively defend against this kind of attack, and it is very difficult to trace it because it can easily forge the source address. Its packet characteristics are usually that the source sends a large number of SYN packets and lacks the last handshake ACK reply of the three handshakes.练霓裳一声凄笑，向着吹来的风，说道：自此世界上再也没有玉罗刹了，我要到我该去的地方。张槐扑哧一声笑了。•小望　往西邊去（中島朋子）一位崇尚西方文化、生活模式的29岁英文老师润子（石原里美饰），梦想着自己将来在国外工作、生活，但此时却因为家人的坚持，而被迫去相亲。更令人意外的是，对方竟然是个和尚。对于润子的工作、梦想，和尚星川高岭（山下智久饰）一直抱持着否定的态度，究竟他只是单纯的爱泼冷水，还是有其他理由。连性观念也无法有所共识的两人，彷佛处于两个不同的世界，而这之间又会擦出怎样的火花他静默一会，忽然问道：爱卿这是想为张家效一份力？王穷道：微臣是为国尽忠。