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Episode 28To obtain the qualification of a preschool teacher, one must have a major in preschool normal education from a secondary specialized school or a secondary vocational school or above. Non-kindergarten teachers' major graduates need a college degree or above to enter for the examination.That is to say, a total of false syn messages will occupy the TCP preparation queue for 63s, while the semi-connected queue defaults to 1024, which is different by system default and can be viewed by cat/proc/sys/net/ipv4/tcp_max_syn_backlog c. That is to say, sending 200 fake syn packets per second without any protection is enough to burst the semi-connection queue, thus preventing the real connection from being established and responding to normal requests. The end result is that the server has no time to ignore the normal connection request-denial of service.他忍不住笑道：还以为这孩子死了呢。第一章：起伏蹲身若奔马，凌空虚顶形神开第二章：转身撩阴手眼合，肘似枪扎臂弹鞭第三章：嵴椎如龙首尾崩，重心垂落寒毛炸第四章：化劲打人如挂画，功夫入髓不惧枪略过简介，肖亮直接看向目录，但是看到目录后，他不由瞪大眼睛，张大嘴巴。