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Compared with SYN cache method, SYN? Cookies technology does not need to allocate space at all when receiving a SYN. Because the most basic data that make up the connection state are encoded and compressed into the sequence number bits of SYN-ACK. For a legitimate connection, the server will receive an ACK message segment with a serial number (actually the serial number has been added by 1), then the basic TCB data will be regenerated, and a complete TCB will confirm that the data will be safely instantiated through decompression. This decompression can be successful even under severe attacks, because there is no storage load at all on the host side, only the load that calculates the encoded data into the ACK sequence number. The disadvantage is that not all TCB data can be added to the 32-bit sequence number segment, so some TCP options required for high performance cannot be encoded. Another problem is that such SYN-ACK message segments will not be forwarded (because forwarding requires complete state data).State machines also have a wide range of uses in game development, especially the logic writing of game AI. The main characters in the game have various states such as walking, attacking, defending, falling and jumping. These states are both interrelated and constrained. For example, if attacked during walking, it will switch from walking state to falling state. In the state of falling, it can neither attack nor defend. Similarly, you cannot switch to the defensive state during the jump, but you can attack. This kind of scenario is very suitable to be described by state machine. The code is as follows:---这个女人，还想把闺女嫁到刘家来，真是做梦。刚刚走到一颗大树下，一个个偌大的蜂巢便从天而降，受惊的山野m-蜂纷纷出动，一时间惨烈的叫声此起彼伏。More new features, waiting for you to experience:Showtime的《#清道夫# Ray Donovan》第五季下周季终，电视台这就宣布续订12集的第六季。另外这位前五季皆在洛杉矶的问题解决者，于第六季将会搬到纽约，而新季会在明年初于纽约开机拍摄。