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Each object has its corresponding state, and each state corresponds to some corresponding behaviors. If an object has multiple states, there will be many behaviors. Then the judgment of these states and the behavior completed according to the states will lead to multiple conditional statements, and if a new state is added, the existing code needs to be changed. This kind of design obviously violates the principle of opening and closing, and the state mode is used to solve such problems.SYN flooding attacks can attack with fewer packets than ordinary brute-force DoS attacks that only send a large number of packets to the target network. However, this requires some understanding of the server's operating system, such as how much backlog queue space it allocates and how long it will keep the TCB in the SYN-RECIEVED state before timeout and discarding the TCB. For example, an attacker can send a certain number of SYN packets that are exactly the size of the backlog queue, and their cycles are just the time when the TCB is recycled, thus making the server permanently unavailable.　　返港后，金刚寻求侦探光头佬（麦嘉 饰）的帮助，谁知黑帮尾随而至，虏走光头佬的妻子贺警司（张艾嘉 饰）作人质。为救爱妻，光头佬带着儿子，协同金刚赶至纽西兰……回来之前，我给大哥去了信，也不知什么时候有回信。顾涧却站起身，对帐内的众将抱拳道：即便黎章真是女子，她杀阿图，斩郎奉，揪出黄连等一干混入军中的奸细，英勇无敌，忠心可表……何风抢上前，大声道：顾将军，让女子混入军中，置军法于何地？顾涧淡然道：本将军并未说她不犯军法。走了十几步，面前呈现个洼地，里面的情形惊得三个少年疾步后退，个个面红耳赤。本来还想再等一等，莫想到他们自己撞上来了。