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Now it is increasingly found that as an algorithm engineer, engineering ability is also very important. If you only understand theory, you will not realize it and have no competitiveness.管你什么，以后不许来。敌人的战舰已经沉没了12艘，而我军只有2艘沉没，其余都是轻伤。That is to say, a total of false syn messages will occupy the TCP preparation queue for 63s, while the semi-connected queue defaults to 1024, which is different by system default and can be viewed by cat/proc/sys/net/ipv4/tcp_max_syn_backlog c. That is to say, sending 200 fake syn packets per second without any protection is enough to burst the semi-connection queue, thus preventing the real connection from being established and responding to normal requests. The end result is that the server has no time to ignore the normal connection request-denial of service.Behavioral pattern is an abstraction of dividing responsibilities and algorithms among different objects. Behavior patterns are not only about classes and objects, but also about their interactions. Behavioral patterns can be divided into two types: class behavior patterns and object behavior patterns.2. Ships of 12m or more but less than 50m in length:Wang Bo joined Osaka Weaving House in 2014, when he had been immersed in the clothing industry for more than 10 years. In his view, if a boss's interest in whether the product can please consumers is far greater than his interest in making money, then the brand will definitely succeed.