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People have studied SYN attack prevention technology earlier. To sum up, there are mainly two categories, one is through firewall, router and other filter gateway protection, the other is through strengthening TCP/IP protocol stack protection. However, it must be clear that SYN attacks cannot be completely prevented. What we have done is to reduce the harm of SYN attacks as much as possible unless TCP protocol is redesigned.(4) Purposeful exercises need to go out of the comfort zone.2. The node objects in the chain can be flexibly split and reorganized, adding or deleting a node, or changing the location of the node is very simple.Command mode belongs to the behavior mode of an object. Command mode encapsulates a request or operation into an object, and separates the responsibility of issuing the command from the responsibility of executing the command through abstraction of the command. The implementation of command mode can provide the functions of revocation and recovery of commands. The specific structure diagram is shown below.苞谷听了愣愣的。像赵大嘴的儿子赵亮、孙铁柱的儿子孙强、李长雨的儿子李敬贤、李长星的儿子李敬德，更有刘家的玄龟、麻虾等，济济一堂。