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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.所以重生之后，周行文不会重蹈覆辙，不会让未来的那些遗憾再发生，他只会用尽一切来珍惜身边的每一个人，然后过好一生。含含糊糊是措辞。何员外拿了银子塞进钱袋，这才不满而去，心下念叨，这堆破风铃都卖出去了，可就是几倍于找自己采购的货款，这小子还真翻身了。