Linux Foundation Certified System Administrator

Here you have the best Linux Foundation LFCS practice exam questions

  • You have 260 total questions across 52 pages (5 per page)
  • These questions were last updated on February 18, 2026
  • This site is not affiliated with or endorsed by Linux Foundation.
Question 1 of 260
Which SysV init configuration file should be modified to disable the ctrl-alt-delete key combination?
Answer

Suggested Answer

The suggested answer is 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.

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Question 2 of 260
During a system boot cycle, what program is executed after the BIOS completes its tasks?
Answer

Suggested Answer

The suggested answer is 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.

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Question 3 of 260
Which run levels should never be declared as the default run level when using SysV init? (Choose TWO correct answers.)
Answer

Suggested Answer

The suggested answer is 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.

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Question 4 of 260
Which of the following statements is correct when talking about /proc/?
Answer

Suggested Answer

The suggested answer is 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.

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Question 5 of 260
What of the following statements are true regarding /dev/ when using udev? (Choose TWO correct answers.)
Answer

Suggested Answer

The suggested answer is 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.

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About the Linux Foundation LFCS Certification Exam

About the Exam

The Linux Foundation LFCS (Linux Foundation Certified System Administrator) validates your knowledge and skills. Passing demonstrates proficiency and can boost your career prospects in the field.

How to Prepare

Work through all 260 practice questions across 52 pages. Focus on understanding the reasoning behind each answer rather than memorizing responses to be ready for any variation on the real exam.

Why Practice Exams?

Practice exams help you familiarize yourself with the question format, manage your time, and reduce anxiety on the test day. Our LFCS questions are regularly updated to reflect the latest exam objectives.