网络平安 计算机网络 防火墙（Network security; computer network; firewall）.doc

网络平安 计算机网络 防火墙（Network security; computer network; firewall） This paper explores the current situation of network security and the origin of new problems, and several major network security technologies, and puts forward some ways to realize network security. Network security; computer network; firewall 1 network security and its current situation 1.1, the concept of network security The international organization for Standardization (ISO) will be computer security is defined as abstract: safe protection system establishment and data processing technology and management to take the protection of computer hardware and software data is not due to accidental or malicious destruction, change and leakage. The definition of computer security includes physical security and logical security two aspects, the logic of peace content can be understood as we often say that the information security, refers to the information confidentiality, integrity and availability of protection, and network security is the meaning extension of information security, the network security protection the network information confidentiality, integrity and availability. 1.2, the current situation of network security At present, small businesses in European countries are suffering from an annual economic loss of up to 22 billion euros due to computer viruses, which are mostly transmitted via e-mail. According to anti-virus vendors, the company said, Sobig, Slammer and other network viruses and worms caused by the network traffic jam, last year, the enterprise caused 55 billion U. S. dollars of loss.. The losses caused by other cyber dangers, including identity thieves and spies, are difficult to quantify, and the loss of new security problems is evident. 2, the main technology of network security Peace is the guarantee of the survival of the network, and only when the security is guaranteed can the network realize its value. Network security technology develops with the development of network practi