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Synflood attack is the most common DDoS attack on the current 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.Create the 'ProductService' class under Packge 'service':No one can deny the role of practice on the road to improving one's skills and continuous improvement. But what are the problems with the 10,000-hour law? What is the original intention of the author Eriksson? How can people learn better?2016年5月26日，正式成立“方块学园”。“方块学园”是优酷土豆联合《Minecraft》知名UP主“籽岷”、“炎黄蜀黍”、“大橙橙橙子”、“粉鱼Pink__Fish”和“五之歌”等其他UP主共同打造《Minecraft》国内原创游戏同人剧频道。该游戏的视频节目在优酷每日播放量也超过千万。上述提到的五名UP主在优酷土豆的自频道总订阅数超过770万，视频总播量超过17.5亿，其中仅“籽岷”一人就拥有307万粉丝以及10.7亿视频播放量，在优酷游戏频道排名第1，全站第1，是国内《Minecraft》游戏视频播放量最大，最受欢迎的UP主。“方块学园”情景短剧的故事场景是一个学园，剧中主角们的学习、生活等日常都在这里展开。学园校训是“格物致知”，而“格物”即代表方块。可以说，“方块学园”是籽岷等UP主在《Minecraft》中的延续和再开发，剧中角色的特点是他们在《Minecraft》这个游戏中的投影。Source2.method1 ();张良想起来汉王吩咐的另外一件事情，欲言又止道：汉王，洪都最近有一件比较有意思的事情。此番进京，想是有事要朕帮忙，但请直说。