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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./v fire超不幸体质的大学生福原幸多（曾田陵介饰）遇到了与自己完全相反的超幸运体质的筱宫直哉（佐藤友祐饰）。“只要和筱宫在一起，就不会发生不幸！”抱着这样的打算接近筱宫的幸多，因为一点误会二人作为恋人交往了。为了不让他人卷入自己的不幸，幸多一直伪装自己，与周围保持距离。然而从外表和内在都帅过头的直哉那里收到的甜言蜜语和温柔破坏力超群，幸多渐渐地不再是伪装的恋人了。UDP Flood is a common DDoS attack, which is often carried out in two ways: small packet and large packetCreate the 'ProductService' class under Packge 'service':Article 22 [Personal Obligation] Insured persons and medical assistance objects shall abide by the following provisions when using medical insurance funds to see doctors and purchase drugs: