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Netflix剧集《同妻俱乐部》获得第四季续订，《老友记》的菲比Lisa Kudrow将客串演出下一季。一位单亲母亲，带着一儿一女(“汤姆·里德尔”弗兰克·迪兰和艾丽西亚·戴伯南·凯瑞饰)，联手男主肖恩(克利夫·柯蒂斯饰)一起末日求生。剧集故事发生的时间与《行尸走肉》第一季相同，不过故事发生地在洛杉矶。虾球，自小生长在香港贫民区的一个小混混，父亲在虾球5岁时便去美国打工，一去便肴无音信，虾球母亲体弱多病，虾球从小便只有一个念头就是“要为了生存而活下去”，但命运总是在和虾球开玩笑，他只想靠自己的力气求一安稳的生活，却阴差阳错地被香港黑社会老大“鳄鱼头”看中成为其手下……在鳄鱼头从黑社会老大成为逃犯，直至在广州风生水起成为清剿队的团长，虾球的命运也随之一路起伏跌宕，最终认清了自己要走的道路。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.但是因为麦克的继续排挤，其时程梦雄已经在一家洗车行洗了几个月的汽车……/waveThis article is the fourth and last in a series on how to use artificial intelligence to build a robust anti-abuse protection system. The first article explains why AI is the key to building a robust protection system, which is used to meet user expectations and increasing complex attacks. After introducing the natural process of building and starting an AI-based defense system, the second blog post covers the challenges related to training classifiers. The third article discusses the main difficulties in using classifiers to prevent attacks in production.