The 386 supports four privilege rings (0 through 3), though in practice nearly all operating systems use just two: ring 0 for the kernel and ring 3 for user programs. Three privilege levels interact on every segment access: CPL (Current Privilege Level), DPL (Descriptor Privilege Level), and RPL (Requested Privilege Level).
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Фото: Ina Fassbender / Reuters，详情可参考服务器推荐
（二）违反国家规定，对计算机信息系统功能进行删除、修改、增加、干扰的；，这一点在爱思助手下载最新版本中也有详细论述
The data (in /sysroot/ostree/repo/objects) is stored in a dedicated directory that contains all system versions. Each version is identified by a hash, similar to Git.