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If the connection initiator is legal, the firewall/proxy will receive the ACK, then establish a connection between itself and the server and disguise the address of the connection initiator. The firewall/proxy separates the two sides of the connection. This segmentation can resist SYN flooding attacks because the server has not accepted SYN from the attacker at all. As long as the firewall/agent implements some TCP-based defense policies, such as SYN? Cookies or SYN? Cache, he can protect all servers behind him from SYN flooding attacks.PS: Many forums have seen beginners ask whether WCF still needs to learn in depth, because they think these technologies may be outdated. Maybe Microsoft will launch a new SOA implementation scheme at that time. Wouldn't it be a waste of time to learn in depth, so they feel that there is no need to learn in depth and just know how to use them. I had the same feeling about this problem before, but now I think that although WCF technology may be replaced, the key to understanding a technology in depth is not to know some more advanced API calls, but to understand its implementation mechanism and way of thinking. Even if the latter technology is replaced, the mechanism behind it is definitely similar. Therefore, if you have a thorough understanding of a technology, you will feel familiar with the new technology and relaxed about it. In addition, after you have a thorough understanding of a technology, you dare to say that you have mastered the technology well during the interview, instead of saying that you use it a lot at ordinary times. Once you ask deeply, you do not know the implementation principle behind it. This is also why I want to write WCF series. I hope this opinion is helpful to some beginners.Reference: Baidu Encyclopedia QQ Flying CarThe character color is white, the character size is ≥ 1.5 mm, and the character line diameter is not less than 0.2 mm.编剧兼导演格蕾塔·葛伟格（《伯德小姐》）所打造的《小妇人》，既忠于路易莎·梅·奥尔科特的经典小说原 作和文笔风格，又利用作者的化身乔·马奇反思并展望自己的人生来延展故事。在葛伟格的构思中，马奇四 姐妹这受人喜爱的故事既是永世经典，又符合当下——这四位年轻女性决定要按照自己的想法过好自己的 人生。本片由西尔莎·罗南、艾玛·沃森、佛罗伦斯·珀和伊莱扎·斯坎伦分别饰演乔、梅格、艾米和贝丝·马奇 四姐妹。还有蒂莫西·柴勒梅德饰演邻居劳里，劳拉·邓恩饰演玛米，梅丽尔·斯特里普饰演马奇婶婶。电影即将在国内上映。