第9章防火墙技术（The ninth chapter is firewall technology）.docVIP

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第9章防火墙技术（The ninth chapter is firewall technology）.doc

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第9章防火墙技术（The ninth chapter is firewall technology） This article is contributed by tsl25 Ppt documents may experience poor browsing on the WAP side. It is recommended that you first select TXT, or download the source file to the local view. The ninth chapter firewall technology chapter Main contents of this chapter 123 firewall technology overview firewall technology firewall design example 9.1 firewall technology overview The definition of firewall, the development history of firewall, the purpose and function of firewall, the limitation of firewall, the development trend and trend of firewall technology Definition of 9.1.1 firewall A firewall is a barrier is arranged between the protected network and the external network, is the information between different networks or network security domain only entrance, according to security policy protected network control (permit deny monitoring) access to network information flow, as far as possible, the information structure and operation conditions of the internal the external shielding network, so as to realize the security of network, in order to prevent the intrusion of potential destructive and unpredictable. Firewall sketch map A brief history of 9.1.2 firewall First generation firewall: packet filtering (Packet Filter) technology. The second, third generation of firewall: in 1989, launched the 1989 circuit protection layer and application layer firewall, the firewall preliminary structure. Fourth generation firewall: in 1992, the fourth generation firewall based on dynamic packet filtering technology was developed. Fifth generation firewall: in 1998, NAI company introduced an adaptive proxy technology, which can be called the fifth generation firewall. The simple history of firewall technology 9.1.3 sets the purpose and function of the firewall (1) firewall is the barrier of network security. (2) firewall can strengthen network security policy (3) monitor and access network access and access (4) to prevent the leak