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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.亚父……这边项羽已经泣不成声。继续第一部中出现将街舞与芭蕾融合的经典桥段之后，《舞力对决2》中又将街舞与拉丁风格的萨尔萨舞相结合，设计别出心裁。影片以在巴黎举行的一场舞蹈大赛为背景，将巴黎的标准性美景融入到了影片中，再加上青春靓丽的演员和热辣动感的舞步，看点十足。故事讲述了一个生活在岐阜，在家不受尊重，在单位不受待见的废柴中年人，因为偶然机会被织田信长附身，从而引发出一系列搞笑但温暖的故事。
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