Linux+ Linux+ Filesystem and Storage Management 2

Question 1

Which command displays the UUID of all block devices on a Linux system?

Accepted Answer

blkid

Answer

blkid queries and displays block device attributes including UUID, filesystem type, and label.

Question 2

A system administrator needs to non-destructively check an unmounted ext4 filesystem for errors. Which command is correct?

Accepted Answer

fsck.ext4 -n /dev/sdb1

Answer

fsck.ext4 -n runs in no-write (read-only) mode, reporting errors without making any repairs.

Question 3

What is the purpose of the /etc/fstab 'dump' field (fifth column)?

Accepted Answer

Controls whether dump utility backs up the filesystem

Answer

The fifth field in /etc/fstab controls whether the legacy dump utility should back up the filesystem (1=yes, 0=no).

Question 4

Which LVM command resizes a logical volume AND its underlying ext4 filesystem simultaneously?

Accepted Answer

lvresize -r -L +5G /dev/vg0/lv0

Answer

lvresize -r (or lvextend -r) uses the -r flag to resize the filesystem automatically after resizing the logical volume.

Question 5

A tmpfs filesystem is mounted with 'size=512m'. What happens when processes try to write more than 512MB?

Accepted Answer

The write fails with ENOSPC

Answer

When tmpfs reaches its size limit, writes fail with ENOSPC (no space left on device), just like any other full filesystem.

Linux Practice Test