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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.一个浪漫的喜剧系列。讲述一位看似霸道实则内心很温柔的霸总Ace和高大帅气的实习生Sky之间的故事。剧情前八集算是铺垫，后面才是精彩。剧情的内容设置也比较多元化，涉及前女友的不甘心的绿茶行为Just like Gu Xixi's speculation, someone really whispered on Jia Min's ear. Jia Min wrinkled up...The lower primary pressure dividing line is 1280, the further pressure is in the 1283-1285 area, the key pressure is 1290 second line, the upper primary support is in the 1275-1273 area, and the key support is 1270. Once the underground is effectively broken, it is further seen to be close to 1260. Pay attention to the rebound range, and it is proposed to keep the situation low in operation.战事势必要陷入僵局，这样的话，对我军将会是巨大的消耗。某日，某辆人工智慧车突然发生暴冲的现象，完全不接受交通中心电脑的管制在路上横冲直撞，理沙与罗娜二位妙龄少女受命驾驶一辆旧型的手排跑车急赴现场救援，二人凭藉绝佳的默契与高超的驾驶技术，终於制伏暴冲车辆挽救三名乘客的性 命，然而灾难并未因此结束，另一个地点又发生不明原因的暴冲事件，这一切的背後似乎隐藏著不为人知的秘密……2. Technical interview: