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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.影が重なる時 八嶋智人 桜井幸子10,000 Yuan Zhao Xiaojuan Zhang Junli Life and Death Beinmei Editor Xu Yue这两人有着其他人类所不具备的特殊力量。她们能够演唱出产生治愈伤口、创造出水、点火等各种各样奇迹的歌声。注：第十六集两集连播Hold down the mouse wheel先生说的是，军权在我手，我说了算。