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If an attacker sends a large number of SYN requests with fake source addresses, the server side will consume a lot of resources to handle this semi-connection, and saving traversal will consume a lot of CPU time and memory, not to mention retrying SYN + ACK on IP in this list. TCP is a reliable protocol, and messages will be retransmitted at this time. The default number of retries is 5. The interval time of retries is doubled from 1s to 1s + 2s + 4s + 8s + 16s = 31s respectively. After the fifth time is sent out, it will take 32s to know that the fifth time has timed out, so the total is 31 + 32=63s.板栗听了心中酸楚，垂下眼睑。《绝代双骄》之所以是经典，很大一部分是因为它的情节设计太巧妙了。Traditional security is a constant stack of security devices, security products, Later, in order to make better use of these secure infrastructure resources, Defence-in-depth emerged, Take the layer as an example, Layer by layer, Defense from the outside to the inside, However, security problems emerge one after another. It also shows that this still cannot well ensure the safety of the organization. Safety is a growing problem, which cannot be solved by one-time deployment. Safety problems not only come from external and internal damages, but also are not rare intentionally or unintentionally. Therefore, the focus should be on sparse, starting from three aspects: detection, emergency response and process.We all know that computers have a certain security protection system. Through the security protection system, computers can detect certain abnormal viruses and give reminders and removals. The DDOS attacker achieves its goal by evading this protection system and carrying out a rejection attack on the computer, thus bringing the other computer into its own control.高凡却不管，他连续奔波几日，很是疲累，因此吃了不少。就在大家以为二人有一场龙争虎斗的时候，红椒却趁那靖军闪避的当儿，小蛮腰一扭，擦着他的身子急掠而过，冲向下一关。