Linux Foundation LFCS Exam Practice Test Instant Access

Question 1

How can the normal output of a command be written to a file while discarding the error output?

Acommand >2>file 1&>/dev/null

Bcommand < output > /dev/null

Ccommand > discard-error > file

Dcommand > /dev/null 2&>1 output

Ecommand >file 2>/dev/null

Answer : E

Question 2

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?

Adebug

Blsof

Cnessus

Dstrace

Etraceroute

Answer : B

Question 3

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

Acore

Bedquota

Culimit

Dquota

Answer : C

Question 4

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

Atcpd

Binetd

Cfingerd

Dmountd

Exinetd

Answer : A

Question 5

Which configuration file would be edited to change the default options for outbound SSH sessions?

A/etc/ssh/sshd_config

B/etc/ssh/ssh

C/etc/ssh/client

D/etc/ssh/ssh_config

E/etc/ssh/ssh_client

Answer : D

Question 6

The presence of what file will temporarily prevent all users except root from logging into the system? (Specify the full name of the file, including path.)

See Below Explanation:

Answer : A

Question 7

With X11 forwarding in ssh, what environment variable is automatically set in the remote host shell that is not set when X11 forwarding is not enabled? (Specify only the environment variable without any additional commands or values.)

See Below Explanation:

Answer : A

Linux Foundation CERTIFIED SYSTEM ADMINISTRATOR Exam Practice Test