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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.突然，张无忌看向朱元璋的眼睛。身处异国他乡，面对陌生的面孔，语言和风土人情，更容易经历不可思议的生活转变。作为一个隐姓埋名的美国杀手，乔在去泰国履行一系列的杀人合同时，同样遭遇了没办法预期得到的生命中的转折。该剧故事发生的年代为明崇祯十七年、清顺元年(即公元1644年)，至南明永历十六年，清康熙元年(即公元1662年)。李自成进北京逼崇祯皇帝煤山自缢，吴三桂为报家伊引清兵入关，清军长驱直入，明王朝因此危亡。李自成称大顺皇帝，张献忠称大西帝,顺治在多尔衮孝庄进京后称帝,在这特殊时期里,谁主沉浮？剧情由此展开.Recently, I fell in love with stockings and happened to see Stance's sports stockings bought decisively. Because it's a perfect match for my nike? Ha, ha, ha, they are all in the same color system. I remember studying before.早晨，付宇锋抱着一捆书，兴冲冲的来到公司。我们的老熟人, 行政事务部（DAA）大臣吉姆哈克上位成功了! 在公务员体系的化身, 内阁秘书汉弗莱阿普比爵士和走钢丝大师, 私人秘书伯纳伍利同学辅佐下, 经过三年艰苦磨练(磨蹭和训练), 哈克终于入主唐宁街十号, 成为英国首相!