Linux Foundation Certified System Administrator (LFCS) Training Questions

1. 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

2. 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

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

4. 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.

5. 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.

6. Which of the following information is stored within the BIOS? (Choose TWO correct answers.)

Boot device order

Linux kernel version

Timezone

Hardware configuration

The system’s hostname

7. Which of the following commands reboots the system when using SysV init? (Choose TWO correct answers.)

shutdown -r now

shutdown -r “rebooting”

telinit 6

telinit 0

shutdown -k now “rebooting”

8. Which of the following are init systems used within Linux systems? (Choose THREE correct answers.)

startd

systemd

Upstart

SysInit

SysV init

9. What information can the lspci command display about the system hardware? (Choose THREE correct answers.)

Device IRQ settings

PCI bus speed

System battery type

Device vendor identification

Ethernet MAC address

10. Which of the following commands brings a system running SysV init into a state in which it is safe to perform maintenance tasks? (Choose TWO correct answers.)

shutdown -R 1 now

shutdown -single now

init 1

telinit 1

runlevel 1

11. What is the first program that is usually started, at boot time, by the Linux kernel when using SysV init?

/lib/init.so

/sbin/init

/etc/rc.d/rcinit

/proc/sys/kernel/init

/boot/init

12. Which of the following commands will write a message to the terminals of all logged in users?

bcast

mesg

wall

yell

13. Which of the following kernel parameters instructs the kernel to suppress most boot messages?

silent

verbose=0

nomesg

quiet

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

systemd.target=rescue.target

systemd.runlevel=rescue.target

systemd.service=rescue.target

systemd.default=rescue.target

systemd.unit=rescue.target

15. After modifying GNU GRUB’s configuration file, which command must be run for the changes to take effect?

kill -HUP $(pidof grub)

grub-install

grub

No action is required

16. Which of the following commands is used to update the list of available packages when using dpkg based package management?

apt-get update

apt-get upgrade

apt-cache update

apt-get refresh

apt-cache upgrade

17. Which of the following commands lists the dependencies of a given dpkg package?

apt-cache depends-on package

apt-cache dependencies package

apt-cache depends package

apt-cache requires package

18. 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?

hidemenu

splash

timeout

showmenu

19. What can the Logical Volume Manager (LVM) be used for? (Choose THREE correct answers.)

To create RAID 9 arrays.

To dynamically change the size of logical volumes.

To encrypt logical volumes.

To create snapshots.

To dynamically create or delete logical volumes.

20. Which of the following commands updates the linker cache of shared libraries?

mkcache

soconfig

mkldconfig

lddconfig

ldconfig

Linux Foundation Certified System Administrator (LFCS) Training Questions

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