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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.这边尹旭怡然高卧时，东阿城西的秦军军营，董翳很是恼怒，愤然质问道：楚军又跑了？左明亦是无奈道：是的，从目前的形势看，楚人似乎又不想渡河了？整日就在东阿一带打转，我军受袭击已经不是一次两次了。　　这些故事都依照原著采用了喜剧的创作手法，有针砭科场作弊的，有褒扬良善之心的，有赞扬对爱的执著的等等。然而它们的主题都十分一致，那就是：人类对爱情亘古不变的追求和对生活的热爱。4. Use vinegar to remove peculiar smell? For a while? Need a car, need a place? This method can be adopted for a period of time.电影依然讲述发生在纽约地下街舞圈的故事。一群年轻人组成团队，为了高额奖金要和世界上最好的街舞舞者一绝高下……故事发生于2008年5月12日，四川汶川发生了特大地震。“一方有难、八方支援”，全国各地纷纷到达前线救灾，尽自己最大的努力救助受灾群众。山东省日照市莒县东皂湖村的十位农民，第一时间自发地驾驶自家农用三轮车，经历三天四夜，行程三千公里奔赴救灾前线。ABC正式宣布续订《实习医生格蕾》第十二季。