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大苞谷忙道：青莲哥哥，你这回一定要一鸣惊人。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.田五点头道：在下回头就告诉队长。18岁那年，ROCKY （秦昊 饰） 一连串脱轨的举动，让他和父亲（张国柱 饰） 之间的关系恶劣到极点，惯性自杀更带给家人无比困扰，一次比一次荒唐，医生斩钉截铁断定ROCKY患了忧郁症。Visitor visitor = new MyVisitor ();