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Facing TCP's three-way handshake protocol, how should attackers launch attacks? The attacker first intentionally initiated a handshake packet. After receiving it, the server puts it into the waiting queue and returns an acknowledgement. Secondly, the attacker will no longer send the third acknowledgement packet, thus the server will make multiple retransmissions (the Linux system configures the number of retransmissions through tcp_synack_retries), consuming a lot of extra overhead, and the waiting queue will be occupied, even the waiting queue will be full, eventually causing the server to be unable to receive the client's request. This is the attack.The company conducted a questionnaire, I found that people still agree with the questionnaire, All the things they usually don't want to say are written out in the questionnaire, and they can also express their dissatisfaction to their heart's content. I hope the company can carry out it every once in a while and listen to the most real thoughts of the employees of the company. It is better for the personnel department to distribute these things to the personnel department and collect them, thus eliminating all the links in the middle. Because we also have some bad things to do. If we collect them again, the cashier will not write down our questions when we think of these things that we can see. This is also a loss to the questionnaire.4. Add the environment just now to Path, select the system variable Path, and click Edit, as shown in the figure:In 2011, then Defense Minister Leon Paneda described the threat of the upcoming "cyber Pearl Harbor", that is, an enemy country can invade the digital system, shut down the power grid, and even go further, "control key switches to derail passenger trains or trains loaded with deadly chemicals". Time magazine reported in 2014 that 61,000 cyber security breaches occurred in the United States that year. At that time, the Director of National Intelligence said that cyber crime was the number one security threat facing the United States that year.在第三部里，三个孩子相继长大。夏雪想考清华大学，差三分没考上，找工作又找不到，选择了复读，从而引发了一系列矛盾。原来的乖乖女，在经历了高考落榜后，成了“问题”少年，争着整容，忙着面试，与家里人势同水火。因为，经过这些天的奔波挣扎，他已经感觉到自己反应更敏锐了。在地球上，汽车人战士们发现了新的能源，也就是被称为“能量晶体”的奇特能源。