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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.罪恶丛生的哥谭市，疯狂的小丑（扎克·加利凡纳基斯 Zach Galifianakis 配音）带领恶棍军团展开新一波的犯罪活动。对他来说，犯罪以及引来宿敌蝙蝠侠（威尔·阿奈特 Will Arnett 配音）是无比快乐的事情，可是猛男蝙蝠侠不仅轻松解决掉这群小坏蛋，还根本不将小丑放在眼里。蝙蝠侠的无情言语，深深刺痛了小丑的心。在此之后，孤独的蝙蝠侠收养了罗宾（迈克尔·塞拉 Michael Cera 配音），看上了美丽的女警长芭芭拉，只不过他始终拒绝别人走入他的内心世界。另一方面，自尊严重受挫的小丑从天空监狱找来了霸王龙、迅猛龙、索伦、伏地魔、金刚等史上著名的大坏蛋，他要狠狠地打击自高自大的蝙蝠侠……《射线照相》拍摄于1971年，保加利亚在共产主义政权下：当时任何西方影响，特别是音乐，都是国家威胁。英国广播公司（BBC）、德国之声（Deutsche Welle）和自由欧洲电台（radio Free Europe）等广播电台受到压制和禁止，所有宗教组织受到限制，任何此类言论都被禁止。根据一个真实的故事，故事讲述的是一位父亲，他步行近100公里到镇上，这样他就可以为迷恋摇滚乐的儿子买一台新收音机。这部电影是关于音乐、自由和身份的1到了这种时候，你若还想临阵脱逃，对得起你死去的父母，对得起我吗？小鱼儿叹了口气，不在说话了。　　桀骜不驯的西厥校尉炎青，双重人格的南楚郡主玲珑，看似毫不相干的两人意外相遇，却在相处中渐生感情。炎青情根深种，原本冷面少言的狼血公子化身“忠犬”，展开各种花式宠爱。而两个注定羁绊的人，正悄然接近一个隐藏多年的狼族秘密……黎水，这件给你。