Linux Foundation Certified System Administrator

Here you have the best Linux Foundation LFCS practice exam questions

You have 140 total questions to study from
Each page has 5 questions, making a total of 28 pages
You can navigate through the pages using the buttons at the bottom
This questions were last updated on May 9, 2025
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Question 1 of 140

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

/etc/keys

/proc/keys

/etc/inittab

/proc/inittab

/etc/reboot

Correct Answer: C

The /etc/inittab configuration file should be modified to disable the ctrl-alt-delete key combination in systems using the SysV init system. This file is used by the init program to define system runlevels and processes started at boot time. Disabling this key combination is typically done by commenting out or modifying the specific line in this file that handles it.

Question 2 of 140

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

The bootloader

The inetd program

The init program

The kernel

Correct Answer: A

After the BIOS completes its tasks during a system boot cycle, the bootloader is executed. The bootloader's primary responsibility is to load the operating system kernel into memory and initiate the startup of the operating system. This is why the bootloader is the correct answer.

Question 3 of 140

Which run levels should never be declared as the default run level when using SysV init? (Choose TWO correct answers.)

Correct Answer: A, E

Run level 0 is used to halt the system and therefore should never be declared as the default run level because the system will not boot up. Similarly, run level 6 is used to reboot the system, and setting it as the default run level would result in the system continuously rebooting without completing the boot process. Therefore, both run levels 0 and 6 should never be set as the default run level when using SysV init.

Question 4 of 140

Which of the following statements is correct when talking about /proc/?

All changes to files in /proc/ are stored in /etc/proc.d/ and restored on reboot.

All files within /proc/ are read-only and their contents cannot be changed.

All changes to files in /proc/ are immediately recognized by the kernel.

All files within /proc/ are only readable by the root user.

Correct Answer: C

The /proc directory is a virtual filesystem that provides an interface to kernel data structures. Files in /proc are not real files stored on disk but represent system and process information dynamically generated by the kernel. Changes to writable files in /proc are immediately recognized by the kernel, as /proc acts as a communication layer with the kernel.

Question 5 of 140

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

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

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

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

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

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

Correct Answer: B, D

When using udev, additional rules can be created by adding them to /etc/udev/rules.d/. The /dev/ directory is a filesystem of type tmpfs and is mounted by udev during system startup. This allows device nodes in /dev/ to be dynamically created and removed as devices are added and removed from the system.