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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.该剧讲述了身具双重人格的方家少爷方天谬，在平常情况他虽然傻里傻气的但却心地善良，但在生病发烧时就会转变成一个思绪缜密、身手了得的人格来解决棘手案件，在经历种种之后，最终体内人格合作与花非花展开了终极对决。第三，他既然勇猛，留他在营寨看守，末将也能放心出战。4. Every two people played one match,香港电视广播有限公司拍摄制作的时装音乐、悬疑、侦探电视剧，主要讲述寻找女高音的故事。由锺景辉、吴岱融、蒋志光、张振朗及黄心颖领衔主演，并由郑敬基、曾伟权、欧瑞伟、韦家雄、曾航生、罗冠兰及龚慈恩联合主演，编剧为龙文康，监制为黄伟声。泰国女星pancake、男星Hunz、和女星jakjaan要合作新电影《Don’t Sleep My Hero》啦，Pancake姐姐终于回来演戏啦，喜大普奔!对于pancake&hunz这个新组合，大家期待吗?HBO剧集《西部世界》宣布续订第4季。