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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.Freeform宣布续订《#成长不容易# grown-ish》第三季。这一会的工夫，两人却不见了踪影，喊了好几声。The mobile phone is equipped with two WeChat messages, which can use the application doppelganger function. The following are the detailed operation steps for logging in to the two micro signals using the mobile phone:看了一眼那张显得有些苍老的面孔，项伯眼中泛起一丝怒意。1960年代初，德克（友塔纳·布格朗饰演）在班武里遇到了美丽的女孩曼妮（婉娜拉·宋提查饰演），并与之坠入了爱河。然而这个女孩却把自己孪生姐姐的名字雯熙当作是自己的名字告诉给了德克，德克对此深信不疑并深陷情网。得知德克窘迫的家境后，曼妮不辞而别，德克伤心不已，想要找回曼妮。 在一个偶然的舞会上，德克见到了真正的雯熙，德克激动之余，雯熙却否认自己认识他。德克以为她的漠然是因为自己的贫穷，而雯熙从不知道自己有一个叫做曼妮的孪生妹妹，更不知道曼妮正用着她的名字到处惹事生非。德克继承了家族的遗产，不久之后与雯熙成婚。然而曼妮却意外出现，想要抢回家产丰厚的德克。到底谁才是德克的真爱？