防火墙在网络安全中的应用（Application of firewall in network security）.doc

防火墙在网络安全中的应用（Application of firewall in network security） View Article Firewall in network security application (1) 2009-10-11 17:07 Abstract: in recent years, Chinas Internet development has made remarkable achievements. By the end of 2008, the number of Internet users in China reached 298 million, an increase of 41.9% compared with 2007, and the Internet penetration rate was 22.6%, slightly higher than the global average (21.9%). After June 2008, Chinas Internet users exceeded the United States, becoming the worlds first, Chinas Internet penetration once again achieve a leap, catch up with and exceed the global average. The impact of the Internet has gradually penetrated into every field of our national economy and all aspects of peoples lives. However, with the continuous innovation and development of Internet applications, information and network security is also facing an unprecedented grim situation, and the challenges faced by the network security field are becoming increasingly severe. Network security problems not only bring inconvenience to the majority of Internet users, but even affect the further deepening of Chinas information construction, threatening the countrys information security and economic development. The research and application of network security have attracted widespread attention. Keywords: network security firewall First, the definition of network security and firewall. With the development of Internet, many kinds of information security problems emerge in an endless stream. At the same time, the software field has formed three major security software: antivirus software, firewall, Trojan killing and removal of rogue plug-ins and other auxiliary security tools software. Then, what is network security and what is the firewall? 1, network security Network security is the network hardware, software and system data to be protected, not because of accidental or malicious reasons and suffered damage, change, leakage, continuous and reliable s