In order to prevent all anonymous FTP users from listing uploaded file names, what security precaution can be taken when creating an upload directory?

Which of the following commands is used to change user passwords in an OpenLDAP directory?

Fill in the blank.
What is the path to the global Postfix configuration file? (Specify the full name of the file, including path.)

In order to join a file server to the Active Directory domain intra.example.com, the following smb.conf has been created:

The command net ads join raises an error and the server is not joined to the domain. What should be done to successfully join the domain?

A zone file contains the following lines:

and is included in the BIND configuration using this configuration stanza:

Which problem is contained in this configuration?