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C. Add yum source不过，当蒲俊打探到番邑即将要运粮给安桐的消息，众人纷纷开怀大笑，受再多的苦也显得无足轻重。This chapter is the last lecture on design patterns. It will talk about the third design pattern-behavioral pattern, with a total of 11 types: policy pattern, template method pattern, observer pattern, iterative sub-pattern, responsibility chain pattern, command pattern, memo pattern, state pattern, visitor pattern, intermediary pattern and interpreter pattern. I have been writing about design patterns for a long time. At last it's halfway through, Writing a blog post is a very time-consuming thing, Because I have to be responsible for the readers, Whether it's graphs, codes, or representations, Everyone hopes to write it as clearly as possible so that readers can understand it. I think both I and the readers hope to see high-quality blog posts come out. Starting from myself, I will stick to it and update it continuously. The continuous motivation comes from the continuous support of readers and friends. I will do my best to write every article well! I hope everyone can give opinions and suggestions continuously and jointly create a perfect blog post!付宇锋一脸殷勤的说道。The principle is that syn messages are first responded to syn_ack by DDOS protection system. With a specific sequence number (recorded as a cookie). The real client returns an ack and the Acknowledge number is cookie+1. The fake client will not respond. In this way, we can know that the clients corresponding to those IP are real and add the real client IP to the white list. The next access passes directly, while other forged syn messages are intercepted. The following is a schematic diagram of protection:?该剧讲述了一个围绕财阀家族展开的复仇和爱情故事。绿箭侠第三季背景讲述的是拥有上亿身价的Oliver Queen遭遇严重的游船事故。在失踪并宣布死亡5年后，被发现生还。当他重回大都市，受到了家人和朋友的热烈欢迎，但他们也感觉他和五年前不同。