以下关于包过滤防火墙和代理服务防火墙的叙述中，正确的是（ ）。
- A.包过滤成本技术实现成本较高，所以安全性能高
- B.包过滤技术对应用和用户是透明的
- C.代理服务技术安全性较高，可以提高网络整体性能
- D.代理服务技术只能配置成用户认证后才建立连接
正确答案及解析
正确答案
解析
本题考查防火墙的基础知识。显然，包过滤防火墙采用包过滤技术对应用和用户是透明的。
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