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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.美剧《血族》改编自吉尔莫·德尔·托罗和Chuck Hogan联合出版的同名小说。承接第一季剧情，在本季中，人类和吸血鬼之间的战争仍在继续， “血祖”The Master 继续实施他的邪恶计划，而病毒已遍布全美，幸存者们不仅要对抗反派，还要继续寻找治疗病毒的方法。据悉，原著角色“昆兰”将登场，第一季血族突击队队长并非真正的昆兰。幕后花絮：畅销小说作家MikeNoonan，在妻子Jo死后，无法走出悲痛的深渊。他不断地梦到和Jo一起购买的缅因州湖畔别墅，梦到装在袋子里的腐烂尸骨，梦见Jo也从裹尸袋中奔跑而出。终于他在Jo的召唤下回到了那栋诡异的别墅。在那里，他卷入了一桩年轻美貌寡妇与家财万贯的祖父对小女孩的抚养权争夺战，并不时遭遇神秘鬼魂的骚扰。那些不断升级的噩梦，还有神秘鬼魂的骚扰，都让他意识到，这个小镇隐藏着一些秘密，而死去的Jo也有事情想要告诉他……故事发生在明朝，失忆的风行烈并不知道自己是蒙古国王子，追求逍遥自由的本性表露无遗，更为了博取靳冰云红颜一笑，决定夺取武林宝剑覆雨剑，因而与韩柏不打不相识，更结交成为好友……　　中国维和警察简桀，在一次行动中将某地祁灵会首领巴茨抓捕，并接到特殊任务押送至法庭受审。一路经历无数次正面交锋，简桀始终保持中国警察的睿智和魄力，却不料一步步深陷巴茨设下的圈套。简桀能否突出重围，将巴茨绳之以法？时隔七年，贝爷再次出道，全新《Man vs Wild》特别篇上线！在《荒野求生》系列节目中，野外探险专家贝尔置身于极为恶劣的自然环境，展现了非凡的求生技巧。在印度特辑中，贝爷首次登陆印度开启冒险之旅，搭档印度总理莫迪，来到了印度科比特国家公园，在湿冷的喜马拉雅山脚下，一起深入险境，探索孟加拉虎栖息地，穿越冰冷湍急的河流，探讨人与自然的共处之道。在此之前，莫迪荣获了联合国地球卫士奖，节目中也看到莫迪对于自然的敬畏与保护。