问题
单项选择题
Basically, a (71) is a standalone process or a set of integrated processes that runs on a router or server to control the flow of (72) application traffic (73) through it. Typically, firewalls are (74) on the entry point to a public network such as the Internet. They could be considered traffic cops. The firewall’ s (75) is to ensure that all communication between an organization’s network and the Internet conform to the organization’s security policies.
75（）
A．male
B．pole
C．role
D．rule
答案
参考答案：C
解析：
基本上，防火墙是一个独立的(standalone)或是一组集成的进程，运行于路由器或是服务器上(server)，控制通过 (Passing)其上的网络应用的流量。传统的防火墙放置在公共(Public)网络(如互联网)的人口处。防火墙的作用(role)是确保组织内部网与公共网的通信都遵守该组织的安全策略。