思科ASA和PIX防火墙配置手册
任何企业安全策略的一个首要部分都是实现和维护防火墙，因而防火墙在网络安全的实现傍边扮演着主要的人物。防火墙一般坐落企业网络的边际，这使得内部网络与Internet之间或者与其他外部网络互相阻隔，并限制网络互访然后维护企业内部网络。设置防火墙意图都是为了在内部网与外部网之间搭建仅有的通道，简化网络的安全管理。(An essential part of any enterprise security strategy is the implementation and maintenance of firewalls, so firewalls play a major role in the implementation of network security. Firewalls are generally located at the edge of an enterprise network, which blocks the internal network from the Internet or from other external networks, restricts network access and maintains the internal network of the enterprise. The purpose of setting the firewall is to build the only channel between the internal network and the external network, and simplify the security management of the network.)
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