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SYN attack is a kind of DOS attack. It takes advantage of TCP protocol defects and consumes CPU and memory resources by sending a large number of semi-connection requests. SYN attacks can not only affect hosts, but also harm network systems such as routers and firewalls. In fact, SYN attacks can be implemented as long as these systems turn on TCP services no matter what systems are targeted. As can be seen from the above figure, the server receives the connection request (syn=j), adds this information to the unconnected queue, and sends the request packet to the client (syn=k, ack=j+1), then enters the SYN_RECV state. When the server does not receive an acknowledgement packet from the client, it retransmits the request packet and does not delete this entry from the non-connection queue until the timeout. With IP spoofing, SYN attacks can achieve good results, Typically, clients forge a large number of non-existent IP addresses in a short period of time, SYN packets are continuously sent to the server, and the server replies to the confirmation packets and waits for the confirmation of the customer. Since the source address does not exist, the server needs to continuously resend until it timeout. These forged SYN packets will occupy the unconnected queue for a long time, normal SYN requests will be discarded, the target system will run slowly, and in serious cases, the network will be blocked or even the system will be paralyzed.After jumping myself 4 times, we can see that the instance and TASKID have not changed, and we can exit the application the last time, as shown in the following figure:ps.追更的童鞋们，免费的赞赏票和起点币还有没有啊~515红包榜倒计时了，我来拉个票，求加码和赞赏票，最后冲一把。1930年，十三岁的林语慧因为是庶出而失去母亲，跟着养母从上海到了南京。为了生计，每日陪着养父沿着秦淮河畔寻觅生计，五年后的偶遇父亲的故友陈默人，被带进新的家庭，与陈沛文兄妹及仆人高伯之孙——高金榜相识，以一个普通女孩的身份继续着忍辱负重的生活。因为父亲林楚沧与陈默人有过指腹为婚之约，她只好将与高金榜的爱情深埋于心，在日寇的铁蹄踏遍南京之时，用孱弱的肩膀挑起了救助难民、保护至死不做汉奸的陈默人的大任。令她未曾想到的是，一直不愿接纳的未婚夫积极走向革命，曾经深爱的人却一步步成为民族的敌人。她在强敌遍布四周的南京，巧设计谋除去民族的敌人；又以民族大义鼓励向自己表达真爱的未婚夫走上更广阔的革命之路。林语慧，一个秦淮河畔的普通女孩，以平凡的歌声唱响了战争年代的南京爱情故事。意大利文艺复兴时期，英俊的艺术家兼工匠莱昂纳多·达·芬奇（汤姆·莱利 Tom Riley 饰）正值青少年华，虽然个性傲慢，却有一颗聪明的脑袋。时下，他正受到佛罗伦萨共和国执政官洛伦佐（艾略特·科万 E lliot Cowan 饰）所托制造复活节庆典装置。因杰出表现荣升为军事工程师。同时，达·芬奇和洛伦佐的情妇卢克蕾齐娅·多纳蒂（劳拉·哈德克 Laura Haddock 饰）有了私情。一位神秘的土耳其人告诉他必须寻找一本神秘书籍——《叶之书》。而因为这本书，教皇的侄子，兼得力助手——吉罗拉莫·里亚里奥伯爵（布莱克·瑞特森 Blake Ritson 饰）也从梵蒂冈来到佛罗伦萨......卢甘斯克地区，2014 年 5 月。Novozhilov 一家偶然发现自己身处卢甘斯克的各种事件之中。弗拉德·诺沃日洛夫（Vlad Novozhilov）曾是阿富汗战争的参与者。他知道什么是战争，在他那个时代已经看到了足够多的战争恐怖，原则上他甚至不想碰武器。在某种情况下，他只看到一条出路——离开这个国家。但是你不能逃避战争，边界已经关闭。为了拯救他的家人，他将不得不做出艰难的道德选择影片讲述了美丽的“无岛”上七名居民连续被杀的故事，徐英姬扮演的女主人公，从原本淳朴的女性一瞬间变成了残忍的女人。另一位主人公池成媛则是见证了一连串事件的人。