102-400 Online Practice Questions and Answers

Which environment variable should be set in order to change the time zone for the commands run from within the environment variable's scope? (Specify the variable name only.)

Which parameter must be passed to ifconfig to activate a previously inactive network interface? (Specify the parameter only without any command, path or additional options)

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

What output will the command seq 10 produce?

A. A continuous stream of numbers increasing in increments of 10 until stopped.

B. The numbers 1 through 10 with one number per line.

C. The numbers 0 through 9 with one number per line.

D. The number 10 to standard output.

What is the difference between the commands test -e path and test -f path?

A. They are equivalent options with the same behaviour.

B. The -f option tests for a regular file. The -e option tests for an empty file.

C. Both options check the existence of the path. The -f option also confirms that it is a regular file.

D. The -f option tests for a regular file. The -e option tests for an executable file.

Which file inside the CUPS configuration directory contains the definition of the printers?

A. cups-devices.conf

B. snmp.conf

C. printcap.conf

D. printers.conf

E. cupsd.conf

What is true regarding the command sendmail?

A. With any MTA, the sendmail command must be run periodically by the cron daemon.

B. All MTAs, including Postfix and Exim, provide a sendmail command.

C. The sendmail command prints the MTAs queue history of which mails have been sent successfully.

D. It is only available when the sendmail MTA is installed.

Why is the correct configuration of a system's time zone important?

A. Because the conversion of Unix timestamps to local time relies on the time zone configuration.

B. Because the time zone is saved as part of the modification times of files and cannot be changed after a file is created.

C. Because the environment variables LANG and LC_MESSAGES are, by default, set according to the time zone.

D. Because NTP chooses servers nearby based on the configured time zone.

Which of the following commands can be used to display the local routing table? (Choose TWO correct answers.)

A. ifconfig

B. dig

C. netstat

D. route

E. trackroute

Which of the following statements is valid in the file /etc/nsswitch.conf?

A. multi on

B. 192.168.168.4 dns-server

C. hosts: files dns

D. include /etc/nsswitch.d/