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章平眼神彷徨，这才意识到出了大事。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.另一边的山芋可没二姐那么讲道理，小娃儿大喊：这边，这边。　　该剧将以雨贤为中心描写网络购物的现况。Before signing the contract, Li Qiang met with Lei Jun, head of Xiaomi. This is not the first time they have met. Shangguan News once wrote that since Li Qiang became the secretary of the Shanghai Municipal Party Committee, he has used all kinds of available time to meet with dozens of tycoons, including Lei Jun. (Frequent meetings with them, what signals do you send?)2. System Recovery Causes ExceptionThere is no mode, write it yourself = work overtime until midnight.