UNIX allows file access based on __________.

UNIX allows file access based on __________.

• A. GID or UID and UNIX permissions.
• B. GID or UID and ACLs.
• C. NT ACLs and SID.
• D. NT ACLs and UNIX permissions.

Answer: (A)

Unix file access is governed by who you are and what groups you belong to, in combination with the file’s permission bits. When access is requested, the system uses your UID to determine if you’re the file’s owner and applies the owner’s permission bits; if not, it checks whether you’re a member of the file’s group and applies the group’s permission bits; if neither, it uses the "others" permission bits. ACLs can extend permissions in some systems, but the core mechanism is UID/GID plus UNIX permissions. Windows NT ACLs and SIDs are not part of UNIX access control.

Unix file access is governed by who you are and what groups you belong to, in combination with the file’s permission bits. When access is requested, the system uses your UID to determine if you’re the file’s owner and applies the owner’s permission bits; if not, it checks whether you’re a member of the file’s group and applies the group’s permission bits; if neither, it uses the "others" permission bits. ACLs can extend permissions in some systems, but the core mechanism is UID/GID plus UNIX permissions. Windows NT ACLs and SIDs are not part of UNIX access control.