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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.在身患“渐冻人症”的城市速写画家马赛克（王祖蓝 饰）眼中，人和物都在“渐冻”，他需要在病情彻底恶化前收集一些快乐的回忆，自小暗恋小学同学神仙鱼（蔡卓妍 饰）的他终于拿出勇气，提出一个遗愿：“给我一天，当我的女朋友，可以吗？”Example: Cardui mariae fructus, the fruit of Silybum marianum九天神话动画版是一部原创国产动画。动画内容全部取材于中国神话，以大胆新颖的创意，搞笑诙谐的表现手法，全新演绎了中国传统神话的内容。将已经被认为是过时老土的中国神话，重新搬到大家面前，希望能够引起大家对于传统神话的一些新的认知，这是这部动画最初的出发点和核心思路。九天神话动画版由许多个不同的神话小故事构成，互相之间没有直接联系但是人物会交叉出场，这也是中国神话的一个特色。罗龙文正愁得发慌，刚好有老乡来听自己发牢骚那是求之不得，可当他见到此人之时，着实慌了。公元3018年，在遥远的外太空，有一个与地球平行存在的星球，有一些神秘的力量在城市中游离，他们隐居在人类中，一片祥和。与此同时，有一股邪恶势力突然出现，整个立新市都笼罩在黑暗的阴影中。刘地、周影、南羽组成正义联盟，出生入死，一次次粉碎邪恶势力的阴谋，保护人类，维护正义与和平。由爱奇艺出品、上海品盈影视传媒有限公司倾力打造的东方奇幻异闻录《都市妖奇谈》正式宣布定档2月26日上线播出。该剧改编自可蕊的同名人气小说，力邀知名导演张力亲自操刀，集合了杨世瀚、张彬彬、郑雅文、王艺嘉、郑旭东等颜值鲜肉实力出演。