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It was the Spring Festival. Everyone around me is robbing red envelopes, panning for New Year's goods, buying tickets and buying all over the world... Who would have thought that my peers are in Shanghai, which is famous for postage, and cannot enjoy the convenience of online life, just because there is a "dot" in her name.Is there any way to prevent such attacks? First, expand the broadband of the server; Secondly, choose TCP protocol as much as possible. Finally, some enlarged return packets are directly discarded.On personal computers, there are five most commonly used operating systems: DOS, Windows, Unix/Xenix, and OS/2. DOS System-In the 17 years since its inception in 1981, DOS has undergone 7 major version upgrades, from version 1.0 to version 7.0 now, continuously improving and perfecting. Windows System-Windows is the first generation of window visual interface published by Microsoft in November 1985, which makes PC enter the so-called GUI (Graphical User Interface) stage. Unix system. Unix systems were initially used on small and medium-sized computers. Unix is a multi-user system, which generally requires more than 8M of memory and a large capacity of hard disk. Linux system-Linux is the largest free software in the world at present. It is an operating system with functions comparable to UNIX and Windows and has complete network functions.9-1? Restaurant: Create a class named Restaurant whose method __init__ () sets two properties: restaurant_name and cuisine_type. Create a method named describe_restaurant (), where the former prints the above two messages, and a method named open_restaurant (), where the latter prints a message indicating that the restaurant is open.　　在这一对笑料百出的男女周围，活跃着众多个性鲜明的人物，他们间发生了许多妙趣横生Bai Jugang, born on November 2, 1993 in Jiangyou City, Mianyang City, Sichuan Province, is a male pop singer and film actor from mainland China. He graduated from the Vocal Music Department of Sichuan Normal University's Conservatory of Music with Grade 2012.