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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.李向天随美女师父神游万界，携带满级功法归来踏入修仙之旅。一路上，李向天在贱萌神猪的陪伴下，一步步救回被十大皇府抓走的妹妹，帮助妹妹解开原幻灵大陆第一帝国大武朝覆灭的原因，灭十大皇府，重振大武朝。之后更是发现自己古国皇子的身份，在尔虞我诈的阴谋中，统一幻灵大陆，为解救自己的师傅叶妃灵，前往诸天战场，战剑仙，斩魔皇，独闯诸天万界成就霸道第一神。打开启明，看到那熟悉的网页，还有些睡眼迷蒙的李越顿时变得精神抖擞。该剧讲述了日本侵略者在上海孤岛时期和汪伪时期对中国秘密买卖鸦片，遭到以袁帅、关爽为首的青年反抗的故事。在满是“第一次”的每一天里，小路全力奔跑着！事先看过白发倾城照片，郑武当然知道练霓裳就是女主角。影片改编自阿加莎·克里斯蒂的同名小说，将故事背景搬到了现代。讲述了一起发生在火车上的谋杀案。