102-400 Online Practice Questions and Answers

What command displays all aliases defined in the current shell? (Specify the command without any path information)

Which command is used to add an empty group to the system? (Specify ONLY the command without any path or parameters.)

Please specify the top directory containing the configuration files for the CUPS printing system. (Specify the full path to the directory.)

Which port is the default server port for the HTTPS protocol? (Specify the port number using digits.)

Which of the following words is used to restrict the records that are returned from a SELECT SQL query based on a supplied criteria for the values in the records?

A. CASE

B. FROM

C. WHERE

D. IF

Which of the following commands should be added to /etc/bash_profile in order to change the language of messages for an internationalized program to Portuguese (pt)?

A. export LANGUAGE="pt"

B. export MESSAGE="pt"

C. export UI_MESSAGES="pt"

D. export LC_MESSAGES="pt"

E. export ALL_MESSAGES="pt"

Which commands can be used to change a user's account aging information? (Choose THREE correct answers.)

A. usermod

B. passwd

C. chattr

D. chage

E. chsh

What is true about the ntpdate command?

A. It is the primary management command for the NTP time server.

B. It updates the local system's date (i.e. day, month and year) but not the time (i.e. hours, minutes, seconds).

C. It queries one or more NTP time servers and adjusts the system time accordingly.

D. It sends the local system time to one or many remote NTP time servers for redistribution.

E. It can be used by any user to set the user clock independently of the system clock.

Which of the following commands will help identify a broken router between the local and the remote machine?

A. ps

B. netstat

C. nslookup

D. ifconfig

E. traceroute

What is true regarding TCP port 23?

A. Port 23 is the well known port for the telnet service which is a plain text protocol that should no longer be used.

B. Port 23 is the well known port for the SSH service which provides secure logins.

C. Port 23 is the well known port for the rlogin service which is SSL secured by default.

D. Port 23 is the well known port for the system login services which are encrypted when the user runs the starttls command in his login shell.