基于网络的侵检测系统（NIDS）通过侦听网络系统，捕获网络数据包，并依据网络包是否包含攻击特征，或者网络通信流是否异常来识别入侵行为。以下不适合采用NIDS检测的入侵行为是（ ）。
- A.分布式拒绝服务攻击
- B.缓冲区溢出
- C.注册表修改
- D.协议攻击
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》入侵检测系统体系结构部分。网络的侵检测系统（NIDS）可以检测到的攻击有同步风暴、分布式拒绝服务攻击、网络扫描、缓冲区溢出、协议攻击、流量异常、非法网络访问等。基于主机型入侵检测系统（HIDS）可以检测针对主机的端口和漏洞扫描；重复登录失败；拒绝服务；系统账号变动、重启、服务停止、注册表修改、文件和目录完整性变化等。
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