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The foundation of SYN flooding attack is the design of three-way handshake when TCP is used to establish connection. The third packet verifies that the connection initiator has the ability to accept the packet at the source IP address used in the first request, that is, its return is reachable. Figure 1 shows the process of exchanging packets at the beginning of a normal TCP connection.//Create Original Class未观测的战略级魔法，将朝鲜半岛南端的军事都市及舰队消灭了。Interception by the Web server is very performance consuming, especially Apache. For a slightly larger attack, this method is useless.杨寿全心中一股寒风抹过。In this example of abstract factory, there are two specific tables (user and dept) and two processing methods (SQL and access). According to the processing method, it is divided into two factories. Each factory has two abstract table processing, and each table processing is an abstract.