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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.Get through the last kilometer以国家安全局(NSS)为舞台，讲述国家安全局要员与犯罪组织进行周旋、斗争的故事。故事中金贤俊(李秉宪饰)与陈思宇(郑俊浩饰)同属NSS机密要员，二人同时爱上了上司崔胜熙(金泰熙饰)。一天，贤俊与思宇被委派到执行一项秘密任务，竟发现韩国正在受到核武的威胁中。在这一触即发的情况下。两人不单要决择，如何挽救整个亚洲的核爆危机，并发现胜熙竟是…在一次例行飞行，飞行员安德列.舒伯特遇到一个神秘而危险的天气现象。通过从根本上改变了她的飞行计划，她是能够避免的风暴和安全降落飞机连同其120个乘客在一个小社区机场。虽然庆祝作为一个英雄，安德列停赛，因为她跟着自己的直觉而不是控制塔指示。在阿尔卑斯山的施蒂里亚她遇到兄弟汤姆和伯尼，在一次飞行，伯尼突然被卷入了一场异常猛烈的风暴，他的飞机坠毁。为了帮助兄弟留在企业，安德列在接任伯尼。他们执行一个非常危险的实验。亚历山大代号“舒伯特”，是个听力极度敏锐的人，通过周边环境的声音能判断出对话发生的地点，辨别出轻微不同的口音，也能听到常人听不不到的声音频率。舒伯特的妻子奥尔加在反恐情报局工作，但被杀害，临死之前，留下了恐怖组织的地点等信息，这些信息只有舒伯特能译解。最后，舒伯特加入她妻子所在部门，试图找出凶手以及击败恐怖组织。好一会才道：你歇息去吧。Fortunately, evolution has left a way for ordinary people. This kind of long-term memory ability is related to specific fields, and can be acquired through what he calls deliberate practice. As long as you work hard, after tens of hours to thousands of hours of hard work, you can buy the SSD hard disk that can be called by working memory memory chips and used by virtual memory, that is, long-term memory.