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啊？秦淼眨巴着泪眼愣愣地看着她，十分不解。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.告诉他，只要他好好回答，这银子就送他。In the last article, the 19th report of the "Standard Answer" pointed out that the urbanization rate has increased by 1.2 percentage points per year, and the _ _ _ _ _ _ _ _ agricultural transfer population has become urban residents.　　曾是恋人关系的政宇和载熙重逢，履行任务中载熙陷入危机，政宇不顾性命去救她。勇冠重新把政宇叫到NTS，派他和前朝鲜情报要员基秀去阿尔及利亚完成特殊任务。政宇在机场看到基秀后大吃一惊，到达阿尔及利亚后，政宇在基秀的帮助下找到国际恐怖组织的根据地。For the same event, for example, there are two event names (triggered in the bubble phase) (triggered in the capture phase), both the bubble and capture are simulated by the event. The events bound to the above are basically in the bubble phase (with additional processing for whell, focus and scroll), as shown in the following figure.