以下不属于防火墙功能的( )。
- A.控制对特殊站点的访问
- B.防范病毒
- C.记录和统计网络用户的访问信息
- D.保护易受攻击的服务
正确答案及解析
正确答案
解析
本题考查防火墙基本功能。
防火墙的功能有:
(1)保护易受攻击的服务
(2)控制对特殊站点的访问
(3)集中化的安全管理
(4)对网络访问进行记录和统计
不能实现的功能有:
(1)限制有用的网络服务
(2)不能防范内部网络用户的攻击
(3)不能完全防范病毒
综上所述,本题选B。防火墙不能防范病毒。
(1)有关三种防火墙的分类
包过滤防火墙:传输数据以“包”为单位进行,分割成一定大小的数据包,每个数据包都含有一些特定信息。
代理服务防火墙:代理服务防火墙使用一个客户程序与特定的中间节点连接,然后中间节点与服务器进行实际连接。
复合型防火墙:将两类防火墙结合起来,形成新的产品,发挥各自优势,克服各自缺点,满足更高安全性要求。
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