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If an attacker sends SYN packets quickly with their own undisguised IP address, this is a so-called direct attack. This attack is very easy to implement because it does not involve spoofing or modifying packets below the user layer of the attacker's operating system. For example, he can simply send many TCP connection requests to implement this attack. However, for this attack to work, the attacker must also prevent his system from responding to SYN-ACK packets because of any ACK, RST, or ICMP (Internet? Control? Message? Protocol) will cause the server to skip the SYN-RECEIVED state (go to the next state) and remove the TCB (because the connection has been successfully established or recycled). Attackers can do this by setting firewall rules, causing the firewall to block all packets (except SYN) to reach the server, or causing the firewall to block all incoming packets so that SYN-ACK packets are discarded before reaching the local TCP handler.“校阅” 意思：查找、研究文章或原稿中的错误或不全面的部分，并进行更正或校正。主角是一位疯狂热爱时尚的28岁女性，名叫河野悦子。她拥有异常旺盛的好奇心，口头禅是"为什么？"、"为何呢？"。"Bus and subway all-pass one-day ticket"见此，大众都惊讶起来。《海绵宝宝：营救大冒险》讲述了海绵宝宝心爱的宠物小蜗被绑架后，海绵宝宝和派大星前往失落的大西洋城展开营救冒险的故事。在这场充满危险又妙趣横生的营救行动中，海绵宝宝和他的朋友们用实际行动证明了友谊的力量无限大！The proportion of those who pass the initial examination is generally about 10%, and those who are selected will undergo another totally enclosed re-examination. Candidates live together and cannot go home. Generally, they have to work for 2 to 3 consecutive days. The content includes very detailed physical examination, exercise and physical fitness tests, coordination and balance tests, will quality tests, etc. I will not elaborate on the specific subjects. In short, most of those who pass the preliminary examination will be eliminated at this level. The rest are all "high-quality products" that choose the best from the best.