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LFCS Linux Foundation Certified System Administrator Free Practice Exam Questions (2025 Updated)

Prepare effectively for your Linux Foundation LFCS Linux Foundation Certified System Administrator certification with our extensive collection of free, high-quality practice questions. Each question is designed to mirror the actual exam format and objectives, complete with comprehensive answers and detailed explanations. Our materials are regularly updated for 2025, ensuring you have the most current resources to build confidence and succeed on your first attempt.

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Total 260 questions

Which of the following options for the kernel's command line changes the systemd boot target to rescue.target instead of the default target?

A.

systemd.target=rescue.target

B.

systemd.runlevel=rescue.target

C.

systemd.service=rescue.target

D.

systemd.default=rescue.target

E.

systemd.unit=rescue.target

Which of the following commands shows the current color depth of the X Server?

A.

xcd

B.

xcdepth

C.

xwininfo

D.

xcolordepth

E.

cat /etc/X11

Which command can be used to delete a group from a Linux system?

A.

groupdel

B.

groupmod

C.

groups

D.

groupedit

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

Which of the following options is used in a GRUB Legacy configuration file to define the amount of time that the GRUB menu will be shown to the user?

A.

hidemenu

B.

splash

C.

timeout

D.

showmenu

What is the command to delete the default gateway from the system IP routing table? (Choose TWO correct answers.)

A.

route del default

B.

ifconfig unset default

C.

netstat -r default

D.

ip route del default

E.

sysctl ipv4.default_gw=0

Which of the following commands determines the type of a file by using a definition database file which contains information about all common file types?

A.

magic

B.

type

C.

file

D.

pmagic

E.

hash

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

After moving data to a new filesystem, how can the former path of the data be kept intact in order to avoid reconfiguration of existing applications? (Choose TWO correct answers.)

A.

By creating an ACL redirection from the old to the new path of the data.

B.

By creating a hard link from the old to the new path of the data.

C.

By creating a symbolic link from the old to the new path of the data.

D.

By running the command touch on the old path.

E.

By mounting the new filesystem on the original path of the data.

What is true regarding TCP port 23?

A.

Port 23 is the well known port for the telnet service which is a plain text protocol that should no longer be used.

B.

Port 23 is the well known port for the SSH service which provides secure logins.

C.

Port 23 is the well known port for the rlogin service which is SSL secured by default.

D.

Port 23 is the well known port for the system login services which are encrypted when the user runs the starttls command in his login shell.

Which utility would be used to change how often a filesystem check is performed on an ext2 filesystem without losing any data stored on that filesystem?

A.

mod2fs

B.

fsck

C.

tune2fs

D.

mke2fs

E.

fixe2fs

During a system boot cycle, what program is executed after the BIOS completes its tasks?

A.

The bootloader

B.

The inetd program

C.

The init program

D.

The kernel

In which directory must definition files be placed to add additional repositories to yum?

Which of the following is observed and corrected by a NTP client?

A.

The skew in time between the system clock and the hardware clock.

B.

The skew in time between the system clock and the reference clock.

C.

Changes in the time zone of the current computer's location.

D.

Adjustments needed to support Daylight Saving Time.

What of the following statements are true regarding /dev/ when using udev? (Choose TWO correct answers.)

A.

Entries for all possible devices get created on boot even if those devicesare not connected.

B.

Additional rules for udev can be created by adding them to /etc/udev/rules.d/.

C.

When using udev, it is not possible to create block or character devices in /dev/ using mknod.

D.

The /dev/ directory is a filesystem of type tmpfs andis mounted by udev during system startup.

E.

The content of /dev/ is stored in /etc/udev/dev and is restored during system startup.

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.

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

A.

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

B.

command < output > /dev/null

C.

command > discard-error > file

D.

command > /dev/null 2&>1 output

E.

command >file 2>/dev/null

Which SysV init configuration file should be modified to disable the ctrl-alt-delete key combination?

A.

/etc/keys

B.

/proc/keys

C.

/etc/inittab

D.

/proc/inittab

E.

/etc/reboot

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Total 260 questions
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