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The advantages of the state mode are as followsAttackers use the controlled host to send a large number of PSH and ACK packets to the target, and the target will consume a large amount of system resources to continuously empty the receiving buffer, resulting in the failure to process the data normally.何奎一声暴喝，手青铜剑已然从拔出，砍了过来。】杨长帆长舒一口气，虽然是一个很模棱两可的说辞，但毫无疑问，这是对自己要求无声的默认。Purple-red: loquat*, banyan (ficus microcarpa), cactus fruit …Visitor mode is to encapsulate some operations applied to a certain data structure. Once these operations need to be modified, the data structure that accepts this operation can be saved unchanged. Visitor mode is suitable for systems with relatively stable data structures. It reduces the coupling degree between data structures and operations acting on data structures, making the set of operations relatively free to change. The specific structure diagram is as follows: