Linux Foundation Linux Foundation Certifications LFCS Questions & Answers

• Question 51:

  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

  Correct Answer: ACD

• Question 52:

  Which of the following commands will write a message to the terminals of all logged in users?

  A. bcast

  B. mesg

  C. print

  D. wall

  E. yell

  Correct Answer: D

• Question 53:

  What output will the following command sequence produce?

  echo '1 2 3 4 5 6' | while read a b c; do

  echo result: $c $b $a;

  done

  A. result: 3 4 5 6 2 1

  B. result: 1 2 3 4 5 6

  C. result: 6 5 4

  D. result: 6 5 4 3 2 1

  E. result: 3 2 1

  Correct Answer: A

• Question 54:

  Which of the following commands will print the last 10 lines of a text file to the standard output?

  A. cat -n 10 filename

  B. dump -n 10 filename

  C. head -n 10 filename

  D. tail -n 10 filename

  Correct Answer: D

• Question 55:

  When given the following command line.

  echo "foo bar" | tee bar | cat

  Which of the following output is created?

  A. cat

  B. foo bar

  C. tee bar

  D. bar

  E. foo

  Correct Answer: B

• Question 56:

  Which of the following commands kills the process with the PID 123 but allows the process to "clean up" before exiting?

  A. kill -PIPE 123

  B. kill -KILL 123

  C. kill -STOP 123

  D. kill -TERM 123

  Correct Answer: D

• Question 57:

  Which of the following keywords can be used in the file /etc/resolv.conf? (Choose TWO correct answers.)

  A. substitute

  B. nameserver

  C. search

  D. lookup

  E. method

  Correct Answer: BC

• Question 58:

  Which of the following commands puts the output of the command date into the shell variable mydate?

  A. mydate="$(date)"

  B. mydate="exec date"

  C. mydate="$((date))"

  D. mydate="date"

  E. mydate="${date}"

  Correct Answer: A

• Question 59:

  Which of the following is true about IPv6?

  A. With IPv6, the TCP port numbers of most services have changed.

  B. IPv6 no longer supports broadcast addresses.

  C. IPv4 addresses can be used without any change with IPv6.

  D. IPv6 no longer supports multicast addresses.

  E. For IPv6, UDP and TCP have been replaced by the Rapid Transmission Protocol RTP.

  Correct Answer: B

• Question 60:

  Which of the following crontab entries will execute myscript at 30 minutes past every hour on Sundays?

  A. 0 * * * 30 myscript

  B. 30 * * * 6 myscript

  C. 30 0 * * 0 myscript

  D. 30 0-23 * * 0 myscript

  E. 0 0-23 * * 30 myscript

  Correct Answer: D