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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.受到歌剧院老板黑泽和马的邀请，金田一、美雪和剑持警部再次造访歌岛。金田一不知为何有种不祥的预感，他的预感果然实现了。和怪人幽灵寄来的预告书一样，在密室状态下的剧场里饰演卡尔罗达的女演员遭到残杀，从此揭开了连续杀人的序幕！野心勃勃的年轻警探Ariki Davis，被调到皇后镇工作。然而刚刚到这里，就发生了一起命案，死者碰巧是他前一天才认识的农夫。尽管所有人都认为死者是跳桥自杀，Ariki却隐隐觉得没这么简单，加上他与生俱来的某种“神力”，案子就变得更加扑朔迷离。想要在一个人际关系复杂的小镇调查案子，对他这个外来者来说，绝非一件易事 .....Craft and Tradition如果说你想要献上一个美女这说得过去，可是从一开始就打出了联姻的旗号，这就不大对了。改编自2007年出版的畅销同名小说，由小说家金薰创作完成。Star Trek: Enterprise(星际旅行:进取号) 是Star Trek 星际旅行系列的第5部电视连续剧. 由Rick Berman 和 Brannon Braga创作, 2001年开播。设定在22世纪, 剧情随着 Enterprise进取号的航程而展开, 第一艘能达到曲速5的地球星舰。这部电视剧在很多地方打破了常规，它是唯一一部以正常的角色分派贯穿整部剧而且未作过任何更改的"星际旅行"系列电视剧，也是第一部以HDTV格式拍摄替代传统的4:3格式的"星际旅行"系列电视剧，也是第一个从整个系列的开始到结束全部采用电脑成像技术来表现飞船，也是唯一一部有带歌词的片头主题曲的"星际旅行"系列电视剧。这部电视剧原先的标题只有Enterprise进取号; "Star Trek"星际旅行是在第3季"Extinction"这一集才被加上去的。拍了四季以后, 这个系列被UPN 在2005年2月2日终止了,