300-300 Exam Dumps : LPIC-3: Mixed Environments - Exam 300 - version 3.0

The effective permissions of a file created with the permissions777can be calculated considering thecreate maskandforce create mode.

create mask = 711implies that the permission bits are ANDed with 0711, i.e., only the owner can read, write, and execute.

force create mode = 750implies that certain permission bits are always set, specifically 0750, i.e., read, write, and execute for the owner, and read and execute for the group.

Thecreate maskreduces the permissions to 0711, and thenforce create modeadds the 0750 mask to the result.

Original permission:777AND withcreate mask (711):711OR withforce create mode (750):751

Thus, the effective permission is751.

References:

Samba smb.conf man page - create mask

Pluggable Authentication Modules (PAM) provides a system of libraries that handle the authentication tasks of applications (services) on a Linux system. These libraries are loaded dynamically and can be configured in the/etc/pam.ddirectory or in/etc/pam.conf. The PAM modules are divided into four types:

auth (authentication):This module type is responsible for authenticating the user, setting up user credentials, and initiating a session.

account:This module type manages account policies such as password expiration, access restrictions, and checking user permissions.

password:This module type handles the updating of authentication tokens, such as passwords.

session:This module type manages tasks that need to be performed at the beginning and end of a session, like mounting directories or logging.

References

Linux PAM Documentation

Understanding PAM

DFS (Distributed File System):This allows for the organization of shared files on multiple servers in a distributed file system.

msdfs root = yes:This option in the Samba configuration file (smb.conf) enables a share to be a DFS root. This means the share can provide access to multiple other shares possibly located on different servers, creating a single point of access.

Functionality:When enabled, users accessing this DFS root can be redirected transparently to the actual location of the shared files, which might be spread across different servers.

Setup:To configure a DFS root, addmsdfs root = yesto the specific share definition in smb.conf.

References

Samba DFS Configuration