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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.4. The switching relationship between states is just piling up if and else statements in the buttonWasPressed method. Adding or modifying a state may require changing several operations, which makes buttonWasPressed more difficult to read and maintain.ALT + TK such as quick selection《维纳斯之恋》汇聚了当前内地、香港、台湾的一线演员，在选景上则把桂林的自然风光、北京、上海的城市特色一网打尽。该剧的整个故事情节围绕一件婚纱和一幅油画全面展开，讲述了两段发生在独立女性和摄影师，大明星和小歌手身上的时尚爱情故事。The responsibility chain pattern describes how requests are passed along a chain of objects. It forms objects into a chain, and the sender sends the request to the first receiver of the chain and passes it along the chain until there is an object to process it or until there is no object to process and it remains at the end of the chain.The biggest difference between the two is that the MAC OS system is not started in DFU mode, and itunes cannot decide whether the iPhone recovery process is interrupted, because the system is not started and related services cannot be enabled. It is said that the iPhone recovered in DFU mode is more thorough, and I have not compared it, so I will not make a conclusion here.A grain of sand is not a pile. If one grain of sand is not a pile, then two grains of sand are not piles. If 2 grains of sand are not piles, then 3 grains of sand are not piles. By analogy, 9999 grains of sand are not piles either. Therefore, 10,000 grains of sand are not yet piled up.