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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.1.倦怠期特效药虽然桃花并未全开，然那含苞待放的情景也十分美好，且是清晨，花苞沁出一股细细的幽香，真令人心旷神怡。1. Take an examination of Putonghua certificate (Chinese teachers should be above Grade II and Grade a; Other subjects should be above Grade II and Grade B)本剧以0.1毫米的失误也不被容许的脑外科为主题，天海饰演脑外科专家深山瑶子，一方面对工作充满热情，另一方面又抱有抛弃家人的罪恶感。