EX200 Create and configure file systems Practice Test 3 — 15 Questions

Question 1

Based on the exhibit, which device is used for swap?

Accepted Answer

The UUID deadbeef-cafe-babe-0000-000000000000. The exhibit shows a swap partition with the UUID deadbeef-cafe-babe-0000-000000000000. In Red Hat Enterprise Linux, swap devices are identified by their UUID in /etc/fstab, and the 'sw' or 'swap' keyword in the mount options column confirms this. The other UUIDs correspond to non-swap filesystems or are not present in the exhibit.

Answer

/dev/mapper/vg00-home

Answer

/dev/sda2

Answer

The UUID abcdef01-2345-6789-abcd-ef0123456789

Answer

The UUID 12345678-1234-1234-1234-123456789abc

Question 2

A server running RHEL 9 has an LVM logical volume /dev/vg00/lvol0 formatted with XFS, mounted at /data. The administrator needs to increase the file system size from 100GB to 150GB. Which command sequence should be used?

Accepted Answer

lvextend -L +50G /dev/vg00/lvol0; xfs_growfs /data. It first extends the logical volume by the exact amount needed (+50G) using lvextend, then grows the XFS filesystem to match using xfs_growfs. XFS filesystems can be grown online (no unmount required), and xfs_growfs expands the filesystem to fill the available space in the logical volume.

Answer

xfs_info /data; lvextend -L 150G /dev/vg00/lvol0

Answer

umount /data; lvextend -L +50G /dev/vg00/lvol0; mount /data; xfs_growfs /data

Answer

resize2fs /dev/vg00/lvol0

Question 3

To enable per-user quotas on an XFS file system, which mount option should be used?

Accepted Answer

uquota. On XFS file systems, both `uquota` and `usrquota` are valid mount options to enable per-user quotas—`uquota` is the shorthand, `usrquota` is the long form. However, the Red Hat EX200 exam specifically expects `uquota` as the correct answer, as it is the XFS‑specific notation, and candidates are tested on this exact syntax. While `usrquota` works on XFS, only `uquota` is considered correct for the exam.

Answer

quota

Answer

usrquota

Answer

user_quota

Question 4

A partition /dev/sdc1 is formatted as ext4. The administrator needs to check the file system for errors without making any repairs. Which command should be used?

Accepted Answer

fsck -n /dev/sdc1. The `fsck -n` command checks the file system for errors without making any repairs, as the `-n` flag forces a non-interactive, read-only check. Since /dev/sdc1 is formatted as ext4, `fsck` automatically calls the appropriate ext4-specific tool (e2fsck) with the no-repair option. This matches the requirement to only check for errors without fixing them.

Answer

xfs_repair -n /dev/sdc1

Answer

fsck -y /dev/sdc1

Answer

e2fsck -p /dev/sdc1

Question 5

Which TWO of the following are required to create an XFS file system on LVM?

Accepted Answer

Run mkfs.xfs on the LV. D is correct because the `mkfs.xfs` command is used to create an XFS file system on a block device, such as a logical volume (LV). After the LV is created from a volume group, you must format it with a file system before it can be mounted and used. Without running `mkfs.xfs`, the LV has no file system structure.

Answer

Create a volume group

Answer

Create a physical volume

Answer

Run xfs_admin on the LV

Question 6

Which THREE of the following commands can be used to display information about file systems?

Accepted Answer

df. The `df` command displays information about mounted file systems, including total size, used space, available space, and mount points. It reads the /proc/mounts file to show file system usage statistics, making it a primary tool for file system information.

Answer

fdisk

Answer

du

Question 7

Which TWO of the following are valid mount options for enabling quotas on an ext4 file system?

Accepted Answer

grpquota. `grpquota` is a valid mount option for enabling group quotas on an ext4 file system. Option E is correct because `usrquota` is the valid mount option for enabling user quotas. Both options are recognized by the `mount` command and the ext4 driver to activate quota tracking at mount time.

Answer

quota

Answer

userquota

Answer

noquota

Question 8

The administrator wants to create a new ext4 file system on /dev/sdb1 with a block size of 1024 bytes. Which command should be used?

Accepted Answer

mkfs.ext4 -b 1024 /dev/sdb1. The `-b` flag in `mkfs.ext4` specifies the block size in bytes. To create an ext4 filesystem with 1024-byte blocks on /dev/sdb1, the command `mkfs.ext4 -b 1024 /dev/sdb1` is used. This is the standard syntax for setting the logical block size when formatting an ext4 filesystem.

Answer

mkfs.ext4 -B 1024 /dev/sdb1

Answer

mkfs.ext4 -s 1024 /dev/sdb1

Answer

mkfs.ext4 --block-size 1024 /dev/sdb1

Question 9

A system administrator needs to create an XFS filesystem on /dev/sdb1 with the label 'data'. Which command should be used?

Accepted Answer

mkfs.xfs -L data /dev/sdb1. The `mkfs.xfs` command creates an XFS filesystem, and the `-L` flag assigns a label to the filesystem during creation. The command `mkfs.xfs -L data /dev/sdb1` correctly creates an XFS filesystem on the specified partition with the label 'data'.

Answer

mkfs.ext4 -L data /dev/sdb1

Answer

mkfs.xfs -l data /dev/sdb1

Answer

xfs_admin -L data /dev/sdb1

Question 10

After adding a new disk /dev/sdc, a system administrator wants to mount it persistently at /mnt/backup. Which entry in /etc/fstab is most reliable?

Accepted Answer

UUID=abc123... /mnt/backup xfs defaults 0 0. Using the UUID (Universally Unique Identifier) ensures the filesystem is mounted persistently regardless of device name changes (e.g., /dev/sdc could become /dev/sdd after a reboot or disk addition). The UUID is generated when the filesystem is created and remains constant, making it the most reliable method for persistent mounts in /etc/fstab.

Answer

LABEL=data /mnt/backup xfs defaults 0 0

Answer

PARTUUID=def456... /mnt/backup xfs defaults 0 0

Answer

/dev/sdc /mnt/backup xfs defaults 0 0

Question 11

A server has an LVM volume group 'vg_data' with a logical volume 'lv_data' formatted as ext4. The administrator needs to increase the filesystem size by 2 GB without unmounting. Which set of commands should be used?

Accepted Answer

lvextend -L +2G /dev/vg_data/lv_data && resize2fs /dev/vg_data/lv_data. The filesystem is ext4, which supports online resizing. The `lvextend` command first expands the logical volume by 2 GB, and then `resize2fs` grows the ext4 filesystem to fill the newly allocated space—all without unmounting.

Answer

lvresize -L +2G /dev/vg_data/lv_data && xfs_growfs /mountpoint

Answer

lvextend -L +2G /dev/vg_data/lv_data

Answer

umount /dev/vg_data/lv_data && lvextend -L +2G /dev/vg_data/lv_data && mount /dev/vg_data/lv_data /mountpoint

Question 12

Which command displays the UUID of a filesystem on /dev/sda1?

Accepted Answer

blkid /dev/sda1. The `blkid` command is specifically designed to locate and print block device attributes, including the UUID (Universally Unique Identifier) of a filesystem. Running `blkid /dev/sda1` queries the device's superblock and outputs the UUID, filesystem type, and other metadata, making it the correct tool for this task.

Answer

df -h

Answer

mount

Answer

fdisk -l /dev/sda

Question 13

Which TWO commands are needed to set up a swap partition on /dev/sdd1 for immediate use?

Accepted Answer

swapon /dev/sdd1. The `swapon /dev/sdd1` command activates the swap partition immediately, making it available for the kernel to use as virtual memory. Option C is correct because `mkswap /dev/sdd1` writes the swap signature (UUID and swap superblock) to the partition, which is a prerequisite for any swap device to be recognized by the kernel. Together, these two commands first prepare the partition as a swap area and then enable it for immediate use.

Answer

parted /dev/sdd mkswap

Answer

swapon -a

Answer

mkfs.swap /dev/sdd1

Question 14

The administrator wants to remount /mnt/data with the noexec option. Which command is correct?

Accepted Answer

mount -o remount,noexec /mnt/data. The `mount -o remount,noexec /mnt/data` command changes the mount options of an already mounted filesystem without needing to unmount it first. The `remount` option applies the new `noexec` flag to the existing mount point, preventing execution of binaries on that filesystem. This is the standard and safest way to modify mount options on a live system.

Answer

Edit /etc/fstab to add noexec and reboot

Answer

mount -o remount,noexec /dev/sdb1 /mnt/data

Answer

umount /mnt/data && mount -o noexec /dev/sdb1 /mnt/data

Question 15

A Red Hat Enterprise Linux 8 server is used as a file server. It has a 1 TB disk /dev/sdc formatted as XFS and mounted at /srv/files. The /etc/fstab entry uses the device name /dev/sdc. After a hardware replacement, the new disk is detected as /dev/sdd, and the server fails to boot because /srv/files cannot be mounted. The administrator used 'blkid' and found the new disk's filesystem UUID is 'abc-123'. What is the best course of action to ensure reliable mounting after future reboots?

Accepted Answer

Change the /etc/fstab entry to use UUID=abc-123 and run mount -a. Using the filesystem UUID in /etc/fstab provides a persistent identifier that remains constant regardless of the device name assigned by the kernel. After the hardware replacement, the disk is detected as /dev/sdd, but its UUID ('abc-123') is unchanged. Changing the fstab entry to UUID=abc-123 ensures the system can reliably mount the filesystem on every boot, as the UUID is tied to the filesystem itself, not the kernel's device enumeration order.

Answer

Add the 'nofail' option to the /etc/fstab entry and reboot

Answer

Create a symbolic link /dev/sdc pointing to /dev/sdd

Answer

Use PARTUUID instead of UUID in /etc/fstab