LPIC-1 Devices, Filesystems and FHS — Timed 10 Questions

Question 1

Which THREE directories are required to be directly under the root filesystem (/) according to the Filesystem Hierarchy Standard? (Choose exactly three.)

Accepted Answer

/var. According to the Filesystem Hierarchy Standard (FHS), the directories /bin, /sbin, and /var are required to be directly under the root filesystem. /bin contains essential user command binaries, /sbin contains system administration binaries, and /var contains variable data such as logs and databases. While /lib is also required, the question asks for exactly three options, and among the given choices, these three are the only ones that are both required and part of the set that must be directly under /.

Answer

/lib

Answer

/home

Question 2

Which TWO of the following are valid methods to specify a partition in /etc/fstab?

Accepted Answer

UUID. UUID and LABEL are both valid identifiers for partitions in /etc/fstab. UUID uses the filesystem's universally unique identifier, while LABEL uses a human-readable name assigned to the filesystem. Both are persistent across reboots and preferred over device names like /dev/sda1, which can change.

Answer

PARTUUID

Answer

DEVPATH

Answer

ID

Question 3

According to the Filesystem Hierarchy Standard (FHS), in which directory should third-party static libraries be installed?

Accepted Answer

/usr/local/lib. According to the Filesystem Hierarchy Standard (FHS), third-party static libraries should be installed in directories dedicated to locally-installed software. /usr/local/lib is for libraries that support site-specific software managed by the local administrator. /opt/lib is for libraries that are part of add-on application packages (such as those in /opt). These directories are intended for third-party static libraries that are not part of the core operating system's package management. /usr/lib (D) is reserved for libraries from the distribution's package manager, and /lib (A) is for libraries required for booting and core system functionality.

Answer

/lib

Answer

/usr/lib

Question 4

A system administrator wants to mount a USB flash drive formatted with the ext4 filesystem. The device is detected as /dev/sdc1. Which command should be used to mount the device to /mnt/usb?

Accepted Answer

mount /dev/sdc1 /mnt/usb. The standard mount syntax is `mount [options] `. For ext4 filesystems, the kernel auto-detects the type, so the `-t ext4` option is unnecessary. While option D is syntactically valid, it is considered incorrect here because it includes an extraneous `-t ext4` flag; the question expects the simplest and most straightforward command. Option A is incorrect because `-a` mounts all filesystems listed in /etc/fstab, not a specific device. Option B is incorrect because the arguments are reversed (device must come before the mount point). Therefore, the command that correctly mounts /dev/sdc1 to /mnt/usb is `mount /dev/sdc1 /mnt/usb`.

Answer

mount -a /dev/sdc1 /mnt/usb

Answer

mount /mnt/usb /dev/sdc1

Answer

mount -t ext4 /dev/sdc1 /mnt/usb

Question 5

A Linux system has two SATA disks: /dev/sda (250GB) and /dev/sdb (500GB). The administrator wants to create a logical volume group named 'vgdata' using partitions on both disks, then create a 600GB logical volume named 'lvdata' for a database. Which sequence of commands should be used?

Accepted Answer

pvcreate /dev/sda1 /dev/sdb1; vgcreate vgdata /dev/sda1 /dev/sdb1; lvcreate -L 600G -n lvdata vgdata. It follows the proper LVM sequence: first create physical volumes (PVs) on partitions /dev/sda1 and /dev/sdb1 (the partitions on the two disks given in the scenario), then create the volume group 'vgdata' from those PVs using vgcreate, and finally create the logical volume 'lvdata' with a size of 600GB using lvcreate. This order ensures that the PVs exist before the VG is created, and the VG exists before the LV is created. Only option C uses the correct device names that match the system's disks (/dev/sda and /dev/sdb).

Answer

pvcreate /dev/sdb1 /dev/sdc1; lvcreate -L 600G -n lvdata vgdata; vgcreate vgdata /dev/sdb1 /dev/sdc1

Answer

pvcreate /dev/sdb /dev/sdc; vgcreate vgdata /dev/sdb /dev/sdc; lvcreate -L 600G -n lvdata vgdata

Answer

vgcreate vgdata /dev/sdb1 /dev/sdc1; pvcreate /dev/sdb1 /dev/sdc1; lvcreate -L 600G -n lvdata vgdata

Question 6

During boot, a Linux system displays 'Kernel panic – not syncing: VFS: Unable to mount root fs on unknown-block(0,0)'. Which of the following is the most likely cause?

Accepted Answer

The kernel lacks the necessary driver for the storage controller.. The error 'unknown-block(0,0)' indicates the kernel cannot find a device to mount as root. This typically occurs when the kernel lacks the driver for the storage controller (e.g., SATA, NVMe, SCSI host adapter) needed to access the root filesystem. Without the driver, the kernel cannot enumerate the block device, even if the root= parameter is correct and the filesystem is intact.

Answer

The root filesystem is corrupted and needs fsck.

Answer

The root= parameter in the boot loader points to a non-existent device.

Answer

The initrd is missing or corrupted.

Question 7

Which of the following commands displays the amount of free disk space on all mounted filesystems in a human-readable format?

Accepted Answer

df -h. The `df -h` command displays disk space usage for all mounted filesystems with sizes in human-readable units (e.g., KB, MB, GB). The `-h` flag converts raw block counts into powers of 1024 with appropriate suffixes, making the output easy to interpret at a glance.

Answer

df -i

Answer

du -sh

Answer

df -T

Question 8

An administrator needs to create a new ext4 filesystem on /dev/sdb1 and wants to reserve 2% of the blocks for the root user. Which command should be used?

Accepted Answer

mkfs.ext4 -m 2 /dev/sdb1. The `-m` flag in `mkfs.ext4` specifies the percentage of filesystem blocks reserved for the root user (superuser). By default, ext4 reserves 5% of blocks; using `-m 2` reduces this to 2%, as required. This command creates a new ext4 filesystem on `/dev/sdb1` with the specified reserved block percentage.

Answer

tune2fs -m 2 /dev/sdb1

Answer

mke2fs -r 2 /dev/sdb1

Answer

mkfs.ext4 -R 2 /dev/sdb1

Question 9

A Linux system has a software RAID1 array /dev/md0 consisting of /dev/sda1 and /dev/sdb1. After replacing a failed disk, the administrator runs 'mdadm --manage /dev/md0 --add /dev/sdc1', but the array remains degraded. Which command should be used to check the status of the array?

Accepted Answer

mdadm --detail /dev/md0. The `mdadm --detail /dev/md0` command displays the current state of the RAID array, including its status (e.g., degraded, active), the number of active and failed devices, and the sync/resync progress. Since the array remains degraded after adding a new disk, this command will show whether the new disk has been properly integrated or if there is an underlying issue, such as a missing or failed component.

Answer

mdadm --examine /dev/sdc1

Answer

mdadm --version

Answer

mdadm --query /dev/md0

Question 10

Which directory in the Filesystem Hierarchy Standard (FHS) contains essential user command binaries that are needed in single-user mode?

Accepted Answer

/bin. The /bin directory contains essential user command binaries (e.g., ls, cp, mv) that are required for system booting and repair in single-user mode. According to the FHS, /bin is intended for commands needed by both the system administrator and users when no other filesystems are mounted, making it critical for single-user mode operations.

Answer

/tmp

Answer

/sbin

Answer

/boot