通过代理服务器使内部局域网中的客户机访问Internet时，()不属于代理服务器的功能。
- A.共享IP地址
- B.信息缓存
- C.信息转发
- D.信息加密
正确答案及解析
正确答案
解析
代理服务器就是在计算机客户端和访问的计算机网络(通常是访问互联网)之间安装有相应代理服务器软件的一台计算机，客户端对网络的所有访问请求都通过代理服务器实现。而被访问的网络计算机对请求的回答，也通过代理服务器转达到客户端。代理服务器的主要作用有四个：
(1)代理服务器提供远程信息本地缓存功能，减少信息的重复传输。
(2)所有使用代理服务器用户都必须通过代理服务器访问远程站点，因此在代理服务器上就可以设置相应的限制，以过滤或屏蔽掉某些信息。因此代理服务器可以起到防火墙的作用。
(3)通过代理服务器可访问一些不能直接访问的网站。互联网上有许多开放的代理服务器，客户在访问权限受到限制时，而这些代理服务器的访问权限是不受限制的，刚好代理服务器在客户的访问范围之内，那些么客户通过代理服务器访问目标网络就成为可能。国内的高校多使用教育网，不能访问一些国外的互联网站点，但通过代理服务器，就能实现访问，这也是高校内代理服务器热的原因所在。
(4)安全性得到提高。无论是上聊天室还是浏览网站。目的网站只能知道你来自于代理服务器，而你的真实IP就无法测知，这就使得使用者的安全性得以提高。
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