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21世纪是一个信息化,网络化的时代,计算机网络在促进社会发展,便利人们生活的同时,其中潜伏的不安全性,脆弱性也逐渐凸显出来。近年来计算机网络危险性给军事,经济,政治等方面带来了极大的冲击。金融机构,能源行业受到的网络攻击,有政治背景的黑客行动使得计算机网络安全成为不容忽视的重大问题,因此掌握基本的计算机网络安全防范措施也应成为网络时代的必修课。
In the 21st century, an era of informationization and networking, while computer networks promote social development and facilitate people’s lives, the potential insecurity and vulnerability gradually become apparent. In recent years, the danger of computer networks has brought tremendous impact on the military, economy and politics. Cyber attacks on financial institutions and the energy industry, and hacker operations with political background make computer network security a major issue that can not be ignored. Therefore, mastering basic computer network security precautions should also become a compulsory course in the Internet age.