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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.　　24 名喜剧演员和达人们将与实力派演员合作上演大戏，并在剧情中展开“舌战”，以争取进入下一轮。部分环节是没有剧本的，参赛者的任务便是自己想台词，向别人分享故事。绍兴府街市，人烟鼎沸，虽不及杭州府那样的极致繁华，却也足够让世界上的绝大多数城市低头。　金敏贞饰演神经外科医生，她将以与“NEW HEART”中不同的，随和，内心温暖，如同卡通形象的面貌出现。根据真人真事改编的《密谍伙伴》（X Company）描述五个来自加拿大、美国和英国年轻人在二战期间前往安大略湖一个绝密训练基地接受间谍技能训练（包括破坏、暗杀、爆破、勒索、摩斯密码和地图学），他们随后被派到德军占领地区执行重要任务。33个不同的故事，展现33段不同的人生经历。英国侦探Kris Marshall被指派调查加勒比圣玛丽岛天堂岛上的一起谋杀案。