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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.《瑞奇宝宝》是专为学龄前儿童研发的动画短片，涵盖了儿童心理学家和国际早教专家根据不同月龄而精心设计的早教知识；以寓教于乐的“故事+儿歌+游戏”的模式，陪伴孩子开启4Q天赋：IQ（认知和探索）、EQ（情绪和社交）、AQ（艺术和创意）、MQ（运动和作息）。每集动画都是一个独立的小故事，由故事和儿歌两部分组成；有趣的故事情节和活泼轻快的儿歌能够轻松吸引到宝宝们的注意力，充分发挥寓教于乐的效果。“苍狼”特警队在原始森林中展开大搜捕；一支神秘队伍在森林中前行。他们的目标似乎都是“劫匪”许逸凡（林志颖 饰）和“受害人”何芊芊何芊芊（张娜拉 饰）。 特种兵出身的许逸凡让阅历不丰的何芊芊第一次感受到天下竟有和自己男友萧寒（万思维 饰）截然不同的男人。凭着许逸凡特种兵的经验，他们最终克服艰难险阻，走出了原始森林，但却与“呆哥”（陈佳佳 饰）遭遇而大展拳脚，最终被“苍狼”特警队俘获。 　　何芊芊的男友萧寒长相俊帅，学识渊博，深得何芊芊喜爱和爸爸何振雄（朱虎声 饰）的赏识，被安排在何振雄公司做副总。看着爸爸的身体愈来愈不好，何芊芊按照与爸爸签订的“合约”，还是决定与聚少离多的萧寒结婚，以了却爸爸的心思。然而，许逸凡的出现，完全打乱了这对恋人的生活。 林雨馨（王子子 饰）经何芊芊的挽留，也来到了何家暂住。当晚的一场化妆PARTY，让苦苦寻找男友的林雨馨有了重大发现。第二天，林雨馨不辞而别。 一宗扑朔迷离的奇案发生了，是情杀，还是劫持？伴随着案件的侦破，一段生离死别的奇缘揭开了(2) In the most visible place, the vertical three signs, the top and bottom should be spheres, and the middle one should be rhombus;As Rose Tyler embarks upon her first big TARDIS adventure with the newly-regenerated Doctor, they discover a sinister hospital run by strange cat people and run in to two old acquaintances, The Face of Boe and Cassandra.2 程序警察