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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."I still remember that after the platoon mate checked with me, he was so angry that he scolded her on the spot and smashed her head with the butt of a rifle. However, what flowed out of her was not white, but some green things, which were very sticky, like a kind of colored oil, or rather like very thick green paint."依兰微微一怔，打开火漆密封，从竹筒取出一份帛书。本剧是继英雄一、二季后又一力作，情节环环相扣，让我们沿着上面的蛛丝马迹来寻找英雄之路，上一季末Peter在Hiro的帮助下毁掉病毒，Hiro将Adam送回过去，一切看似恢复太平... 　　然而，Niki为救Monica消失在爆炸的火光当中，Nathan也在记者会上中弹生死未卜一波未平，另一边Sylar已借Claire的血液重获新生，更加黑暗的旅程才刚刚开始... 英雄们将面临抉择，究竟是谁走向了邪恶? Level 5是个什么地方? 人们口中的恶人们又是何人?哪些人沦为了逃亡者--是恶人们四处逃窜还是曾经的英雄只能落得亡命天涯的下场...I don't know, in fact, they were also cheated. And my husband stopped going to work two years ago. "以餐厅为背景,讲述了天才厨师崔正宇（张义秀饰）和LauraDining餐厅的主厨尹道建（李灿亨饰）之间发生的浪漫爱情故事。碧瑶那么好的一个姑娘，天启到底是怎么狠下心来的？碧瑶死了，我感觉都没有心情过年了。