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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.Complement a diagram"Liang Yi" ABO Bar Don't Come in Without Meat [Joking]有一次，她说病了，想见你小叔。7. Increase positions when winning money and decrease codes when losing money. If you don't want to die fast but want to earn fast, this is the only way.　　三丰虽与之生死纠缠，但仍孓然一生。这位集宗教家、爱情故事中的男主角，及身怀绝技的侠客于一身的张三丰，一生劫难，他的忠孝节义及从求佛禅心中悟道的过程有血有激。只要两心相许，何须天长地久……该剧改编自天下霸唱小说《鬼吹灯之怒晴湘西》，民国年间，军阀混战，民不聊生。陈玉楼乃卸岭魁首。他联手军阀罗老歪，入湘西瓶山探秘元墓。途遇搬山道人鹧鸪哨。搬山历来不为财物，只为寻找解除族人诅咒的雮尘珠。为了进入这座从未被人染指的神秘大墓，搬山、卸岭两大派在此结盟。