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2. Udp flood attackThe SYN-Flood attack is currently the most common DDoS attack on the network, It is also the most classic denial of service attack. It takes advantage of a defect in the implementation of TCP protocol. By sending a large number of attack messages with forged source addresses to the ports where the network service is located, it may cause the half-open connection queue in the target server to be full, thus preventing other legitimate users from accessing. This kind of attack was discovered as early as 1996, but it still shows great vitality. Many operating systems, even firewalls and routers, cannot effectively defend against this kind of attack, and it is very difficult to trace it because it can easily forge the source address. Its packet characteristics are usually that the source sends a large number of SYN packets and lacks the last handshake ACK reply of the three handshakes.　　她以为丈夫弗兰克能讲一口流利的法语，事实上，那不过是他有一回喝多了，乱吹而已。弗兰克也曾雄心勃勃，但是被无聊的职员工作所困，只好借酒浇愁，不仅经常烂醉，还欠下一笔风流债。事实上，两个人的内心深处都渴望着全然不同的生活——一种能够满足他们艺术感觉的生活。于是他们决定搬往法国，但是随着两人关系陷入争吵、嫉妒、指责的恶性循环，他们的旅行和实现自我的梦想也受到了威胁……总督有总督的安排。Malus domestica apple若是一味追击，追得越深，凶险越大。手术后玛尔塔生命垂危，而真爱近在咫尺。然而，心灵能否战胜隐藏许久的秘密以及变幻莫测的命运？