LFCS Practice Online

Question 1

What is a purpose of an SSH host key?

A : It must be sent by any SSH client in addition to a user key in order to identify the client's host.

B : It provides the server's identity information to connecting SSH clients.

C : It is the root key by which all user SSH keys must be signed.

D : It authenticates any user that logs into a remote machine from the key's host.

E :

It is used by system services like cron, syslog or a backup job to automatically connect

to remote hosts.

Answer: B

Question 2

Which of the following commands reboots the system when using SysV init? (Choose TWO

correct answers.)

A : shutdown -r now

B : shutdown -r "rebooting"

C : telinit 6

D : telinit 0

E : shutdown -k now "rebooting"

Answer: A,C

Question 3

Given a file called birthdays containing lines like:

YYYY-MM-DD Name

1983-06-02 Tim

1995-12-17 Sue

Which command would you use to output the lines belonging to all people listed whose

birthday is in May or June?

A : grep '[56]' birthdays

B : grep 05?6? birthdays

C : grep '[0-9]*-0[56]-' birthdays

D : grep 06 birthdays | grep 05

Answer: C

Question 4

When running the command

sed -e "s/a/b/" /tmp/file >/tmp/file

While /tmp/file contains data, why is /tmp/file empty afterwards?

A : The file order is incorrect. The destination file must be mentioned before the command to ensure redirection.

B : The command sed did not match anything in that file therefore the output is empty.

C : When the shell establishes the redirection it overwrites the target file before the redirected command starts and opens it for reading.

D : Redirection for shell commands do not work using the > character. It only works using the | character instead.

Answer: C

Question 5

Which configuration file would be edited to change default options for the OpenSSH

server?

A : /etc/ssh/sshd_config

B : /etc/ssh/ssh

C : /etc/ssh/server

D : /etc/ssh/ssh_config

E : /etc/ssh/ssh_server

Answer: A

Name:	LINUX FOUNDATION CERTIFIED SYSTEM ADMINISTRATOR (LFCS)
Exam Code:	LFCS
Certification:	Linux Foundation Certified SYSADMIN
Vendor:	Linux Foundation
Total Questions:	260
Last Updated:	May 14, 2024

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