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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.绿萝听到之后，不由的俏脸微微一红，一时间竟不知如何回答。季节过去，马上第二个春天——。(3) If the delay requirement is high, the optional time relay or electric time relay can be selected; If the delay requirement is not high, the air damping time relay can be selected.Originated from ancient times, human beings lifted stones to show their strength. Modern weightlifting emerged in Europe in the 18th century.到了王府偏殿，板栗先吩咐人去叫陈鲨兄妹来，命人带他们去铜岭山跟大苞谷会合。