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防火墙在互联网中起着非常重要的作用,它通过检查和过滤进出网络的每一个数据包,保护企业内部网免受外来攻击。 防火墙产品一般分为硬件和软件2种,硬件防火墙采用专用的硬件设备,然后集成生产厂商的专用防火墙软件;软件防火墙一般基于某个操作系统平台开发,直接在计算机上进行软件的安装和配置。相对于软件防火墙而言,硬件防火墙往往能提供更优越的网络速度和性能,Cisco公司的PLX防火墙就是一种典型的企业级硬件防火墙产品。
Firewall plays a very important role in the Internet. It protects the intranet from external attacks by checking and filtering every data packet coming in and out of the network. Firewall products are generally divided into two kinds of hardware and software, hardware firewall with dedicated hardware, and then integrate the manufacturer’s proprietary firewall software; software firewall is generally based on an operating system platform development, directly on the computer software installation and configuration. Compared with software firewalls, hardware firewalls often provide superior network speed and performance. Cisco’s PLX firewall is a typical enterprise hardware firewall product.