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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.A young runaway girl hides out in the barn of a retired horse trainer and forms a bond with his troubled filly.红军西路军骑兵团团长龙飞擅用左手刀，令敌人闻风丧胆，因遭遇韩德功带领的黑马团围堵而贻误驰援战机，导致恋人温俪菡的父亲、特派员张布尔的老首长牺牲。张布尔本来就对龙飞和温俪菡的关系不满，加之他对形式判断错误，就秘密下令处决龙飞。龙飞不甘引颈就戮，逃出刑场。在失落、彷徨中，他被奸人所伤而失忆，从此踏上了曲折与苦难并存，心灵流离失所的旅程。抗日战争爆发，龙飞重回组织，受命潜伏在黑马团，执行一项人命关天的秘密任务。国共合作，龙飞与韩德功奔赴抗日前线；捷报连连，二人名声大噪。随之，龙飞真实身份暴露，这给他带来致命的危险，迎接他的将是一场严峻的生死考验。Especially at the arch of the foot, 260D rubber bands are used to realize the compression function, which makes the arch of the foot more comfortable and avoids blisters caused by friction.阵把真带到一栋废墟里，表明了自己的目的，为了推翻皇女的统治来到这个世界，保护真，其实就是保护自己；另一方面，米可带着琴莉去找真，在米可的要求下，琴莉无意中成为米可的fixer，让米可实现精神回路，实力增强。随后米可把阵的机器人打败，救出真。OvO pairs the N classes in pairs to generate N (N-1)/2 binary classification tasks. For example, OvO will train a classifier to distinguish classes Ci and Cj. The classifier takes the Ci class sample in D as a positive example and the Cj class sample as a counterexample. In the testing phase, the new samples will be submitted to all classifiers at the same time, so we will get N (N-1)/2 classification results, and the final results can be generated by voting: that is, the category that is predicted most is taken as the final classification result. Figure 3.4 shows a schematic diagram.