102-400 Online Practice Questions and Answers

Which option in the /etc/ntp.conf file specifies an external NTP source to be queried for time information? (Specify ONLY the option without any values or parameters.)

Which command is used to sync the hardware clock to the system clock? (Specify ONLY the command without any path or parameters.)

What argument to the -type option of find will match files that are symbolic links? (Specify only the argument and no other options or words.)

Which file lists which users can execute commands using sudo? (Specify the full name of the file, including path.)

On a Linux system with shadow passwords enabled, which file in the file system contains the password hashes of all local users? (Specify the full name of the file, including path.)

Which of the following are tasks handled by a display manager like XDM or KDM? (Choose TWO correct answers.)

A. Start and prepare the desktop environment for the user.

B. Configure additional devices like new monitors or projectors when they are attached.

C. Handle the login of a user.

D. Lock the screen when the user was inactive for a configurable amount of time.

E. Create an X11 configuration file for the current graphic devices and monitors.

Which of the following steps prevents a user from obtaining an interactive login session?

A. Run the command chsh -s /bin/false with the user name.

B. Set the UID for the user to 0.

C. Remove the user from the group staff.

D. Add the user to /etc/noaccess.

E. Create a .nologin file in the user's home directory.

Which of the following are commonly used Mail Transfer Agent (MTA) applications? (Choose THREE correct answers.)

A. Postfix

B. Procmail

C. Sendmail

D. Exim

E. SMTPd

What is the purpose of the nsswitch.conf file?

A. It is used to configure where the C library looks for system information such as host names and user passwords.

B. It is used to configure network protocol port numbers such as for HTTP or SMTP.

C. It is used to configure LDAP authentication services for the local system.

D. It is used to configure which network services will be turned on during the next system boot.

What is true regarding a default route?

A. The default route is always used first. When the default route is not available more specific routes are tried.

B. When a default route is set, all other routes are disabled until the default route is deleted.

C. The default route is only used if there is not a more specific route to a destination host or network.

D. Without a default route, no network communication even in directly attached networks is possible.