《计算机信息系统安全保护等级划分准则（GB 17859-1999）》规定，计算机信息系统安全保护能力分为五个等级，其中提供系统恢复机制的是（ ）。
- A.系统审计保护级
- B.安全标记保护级
- C.构化保护级
- D.访问验证保护级
正确答案及解析
正确答案
解析
参见《信息安全工程师5天修炼》的《计算机信息系统安全保护等级划分准则》部分。《计算机信息系统安全保护等级划分准则》（GB17859－1999）给出的第五级 访问验证保护级的特点是：本级的计算机信息系统可信计算基满足访问监控器需求。访问监控器仲裁主体对客体的全部访问。访问监控器本身是抗篡改的；必须足够小，能够分析和测试。为了满足访问监控器需求，计算机信息系统可信计算基在其构造时，排除那些对实施安全策略来说并非必要的代码；在设计和实现时，从系统工程角度将其复杂性降低到最小程度。支持安全管理员职能；扩充审计机制，当发生与安全相关的事件时发出信号；提供系统恢复机制。
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