Linux Foundation Linux Foundation Certifications LFCS Questions & Answers

• Question 101:

  Which command, available with all MTAs, is used to list the contents of the MTA's mail queue? (Specify ONLY the command without any path or parameters.)

  A. mailq, /usr/bin/mailq, sendmail -bp, /usr/sbin/sendmail -bp, /usr/lib/sendmail -bp, sendmail, /usr/sbin/sendmail, /usr/lib/sendmail

  Correct Answer: A

• Question 102:

  How can the existing environment variable FOOBAR be suppressedfor the execution of the script./myscript only?

  A. unset -v FOOBAR;./myscript

  B. set -a FOOBAR="";./myscript

  C. env -u FOOBAR./myscript

  D. env -i FOOBAR./myscript

  Correct Answer: C

• Question 103:

  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.

  Correct Answer: A

• Question 104:

  Which keyword must be listed in the hosts option of the Name Service Switch configuration file in order to make host lookups consult the /etc/hosts file?

  A. files

  Correct Answer: A

• Question 105:

  Which of the following programs uses the hosts.allow file to perform its main task of checking for access control restrictions to system services?

  A. tcpd

  B. inetd

  C. fingerd

  D. mountd

  E. xinetd

  Correct Answer: A

• Question 106:

  Which command is used to set restrictions on the size of a core file that is created for a user when a program crashes?

  A. core

  B. edquota

  C. ulimit

  D. quota

  Correct Answer: C

• Question 107:

  Which of the following commands connects to the remote host example.com which has OpenSSH listening on TCP port 2222? (Choose TWO correct answers.)

  A. ssh --port 2222 example.com

  B. ssh -p 2222 example.com

  C. ssh -o Port=2222 example.com

  D. ssh -o GatewayPort=2222 example.com

  E. ssh example.com:2222

  Correct Answer: BC

• Question 108:

  Which character starts a comment line in a shell script file?

  A. ;

  B. *

  C. #

  D. /

  Correct Answer: C

• Question 109:

  After configuring printing on a Linux server, the administrator sends a test file to one of the printers and it fails to print. What command can be used to display the status of the printer's queue? (Specify ONLY the command without any path or parameters.)

  A. lpq, /usr/bin/lpq, lpstat, /usr/bin/lpstat

  Correct Answer: A

• Question 110:

  When trying to unmount a device it is reported as being busy. Which of the following commands could be used to determine which process is causing this?

  A. debug

  B. lsof

  C. nessus

  D. strace

  E. traceroute

  Correct Answer: B