假如你上过一段时间的Internet,特别是当你在一家比较大的公司工作中需在浏览网站时,你可能会听说过防火墙这个名词。如你听到同事说“我访问不了那个网站,因为它们不让我通过防火墙。”;如在家里你有快速Internet连接(DSL连接或者电缆调制解调器),也可能会见到这样的网络的信息。 If you have been on the Internet for some time, you may have heard of the term firewall, especially when you are surfing the web in a larger company. As you heard from my colleagues, “I can not access that site because they do not allow me to go through the firewall.” You may also see information about such networks if you have a fast Internet connection (DSL connection or cable modem) at home.