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If an attacker sends a large number of SYN requests with fake source addresses, the server side will consume a lot of resources to handle this semi-connection, and saving traversal will consume a lot of CPU time and memory, not to mention retrying SYN + ACK on IP in this list. TCP is a reliable protocol, and messages will be retransmitted at this time. The default number of retries is 5. The interval time of retries is doubled from 1s to 1s + 2s + 4s + 8s + 16s = 31s respectively. After the fifth time is sent out, it will take 32s to know that the fifth time has timed out, so the total is 31 + 32=63s.他则脱了衣裳，只穿一条内裤跳下水，在水里畅游了几圈，这才用渔网顺着山塘边沿来回兜转。这是一部根据夕希实久在LINE漫画上刊登的同名漫画改编的作品。以让单身社会人和啃老族结婚的法律“啃老族保护法”成立的社会为舞台，描写了啃老族、家里蹲的泽本阳茉梨和国家公务员秋保心的夫妇生活。You don't cherish me now《毒枭》在经过三季于哥伦比亚的反毒战争后将告一段落。Netflix将原来的第四季独立出来作为衍生剧《毒枭：墨西哥篇》（Narcos: Mexico）。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!离家多年、独自生活的平井，不得不在个人理想和家庭责任之间做出抉择；