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The 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.The Upload.prototype.init method does some initialization work, including creating some nodes in the page. In these nodes, two buttons are mainly used to control the upload process. The first button is used to pause and continue upload, and the second button is used to delete files:梦公司斥巨资开发了一款智能虚拟游戏，游戏高度逼真，一经投放，便立即引起了全球玩家的注意。32岁的许晗在上海工作了八年，他疲惫不堪，想回老家，到乡下找老同学沈欢歌，偶遇杜笑语，并一见钟情。沈欢歌已经暗恋杜笑语十年，杜笑语决定辞职回家开办农场，许晗觉得办民宿不错就租下了杜笑语家的老房子，开办起了民宿。因为杜笑语老爸贪便宜，把杜笑语的果树都给用除草剂烧死了，许晗给出了主意搞无土水培。这时沈欢歌患了重病，他要许晗保证要对杜笑语好一辈子。许晗的民宿办的有了起色，很多人想来学习，从而办起了民宿学校。根据市场需求杜笑语的果园办起了养鸡场，村民开始赚到了钱脱离了贫困。沈欢歌身体却越来越虚弱，沈欢歌要许晗和杜笑语二人尽快结婚，二人答应了沈欢歌，其实沈欢歌是编造出来得了病，让他们两人在一起。民宿和养鸡场办的越来越好，他们的感情也越来越深，他们在绿水青山之间，过上了幸福的生活。九一八事变后，唐问生与夏潇雪在乱世途中巧遇又阴差阳错的分离。潇雪赶赴我革命根据地，而唐问生却在叔叔唐定乾的诱导下进入了国民党军统特务训练营。一年后，唐问生受军统之命打入共产党内部潜伏，再次和夏潇雪相遇。此时抗日战争全面爆发，两人在战火中结为夫妇，身为军统卧底的唐问生渐渐被共产党人坚持抗日的气节感化，他无法向心爱的妻子吐露自己真实身份，内心挣扎不已。抗日如火如荼，夫妇俩在执行任务中日益默契屡立战功。唐定乾以军统身份指令唐问生全力诱捕共产党人，唐问生表面答应暗中千方百计保护潇雪和其他：同志的安全。此时的潇雪发现了丈夫的真实身份伤心欲绝。夫妻俩接到命令--除掉对方！在潇雪的帮助下，唐问生终于认清唐定乾的汉奸面目，毅然随妻子弃暗投明并亲手杀了叔叔。夫妻俩携手潜入日本人的兵工厂，为夺取最终的胜利共同唱响了一幕壮烈的抗日悲歌。MoveOther levels also include level 2 and level 3, which are distinguished according to safe flight time and technology accumulation.