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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.Freeform宣布续订《#成长不容易# grown-ish》第三季。不过那时候选人恐怕又会多了扫地僧、黄裳、达摩、张三丰，嗯，李寻欢、邀月、令东来、浪翻云，甚至是萧炎、叶凡、王超都会乱入其中。年近50的唐达明为了庆祝女儿第一天上班忙碌不堪。二十多年来，他和一双儿女一直生活在这栋海边小屋里，开了一家名叫“唐记”的餐厅。儿子唐铠是国家队十项全能的种子选手，女儿唐雨刚刚大学毕业并成为了一名小学老师。二十多年来，他们仿佛是世界上最和睦最幸福的一家人。庆祝宴会前，一连串神秘的恐怖事件让唐达明惴惴不安，儿子唐铠的突然出现又让唐达明又欣喜又诧异，虽然唐铠宣称他特意为家人请假回家，可唐达明却还是觉得奇怪；老同学薛志强孙慧敏夫妇和他们的儿子—天才脑外科医生薛东霖也前来道贺，薛东霖是一个医术高超、对自己的职业如信仰般坚持的医生。唐达明敏感地发觉儿子和薛东霖似有芥蒂。宴会进行到一半，一直冷嘲热讽的薛志强却忽然指责唐铠打伤了薛东霖，误会刚刚解除，唐铠又因为有人报案他打伤薛东霖而被110带走……为了亲情宁可放弃爱情的唐雨误会薛东霖背后对哥哥放冷箭，而唐铠也觉得妹妹的男朋友是一个不那么光明磊落的男人。随着年轻人误会和矛盾的升级，唐达明发现女儿和儿子原来都对自己隐藏了秘密。《孔子》:讲述的是留学美国的女学生梅燕,为完成一部研究孔子的博士论文,回到中国,由此展开本剧故事的两条线索:A,孔子的生平及其主要思想；B,在研究孔子的过程中,梅燕身边所发生的当代生活的方方面面,以及对孔子精神的思考.At present, the per capita production of municipal solid waste in China is (0.8 ~ 1.3) kg/person & dot; D, 1.1 kg/person & dot; D is the basis for design (including all the population living in the region). At present, in cities that have built incineration facilities in China, the low calorific value of domestic waste is mostly around 5000kJ/kg, and the water content is generally greater than 50%. Compared with cities in developed countries, it is characterized by low calorific value, high water content, large changes in composition, certain difficulties in garbage incineration, and low thermal efficiency of garbage incineration boilers. In terms of steam parameters, the steam parameters of waste heat boilers in waste incineration plants are usually medium temperature and medium pressure parameters (4MPa and 400 ℃).Nikita和Michael的关系一开始相对稳定，但随后发生了一些可怕的事情，令Michael面临巨大的考验——他和所有人的关系都变得紧张，这其中当然包括Nikita。而其他的人也有了各自的想法，第三季后半段组织将遭受重大考验