【单选题】【消耗次数：1】
目前在防火墙上提供了几种认证方法，其中防火墙设定可以访问内部网络资源的用户访问权限是（ ）。
①
客户认证
②
回话认证
③
用户认证
④
都不是
参考答案：
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相关题目
【多选题】
关于防火墙，叙述正确的是（）
①
A、防火墙可通过屏蔽未授权的网络访问等手段把内部网络隔离为可信任网络
②
防火墙的安全性能是可根据系统安全的要求而设置，因系统的安全级别不同而有所不同
③
防火墙可以有效的查杀病毒，对网络攻击可进行检测和告警
④
防火墙可以用来把内部可信任网络对外部网络或其他非可信任网络的访问限制在规定的范围之内
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