EX200 Create and configure file systems Practice Test 2 — 15 Questions

Question 1

Match each command to its function in managing storage.

Accepted Answer

fdisk: Manipulate disk partition table. The correct matches are: fdisk for partition table manipulation, mkfs for filesystem creation, mount for attaching filesystems, and lvcreate for logical volume creation. Common confusions include associating df or du with filesystem creation, and confusing lvcreate with display commands.

Answer

df: Create a filesystem

Answer

lvcreate: Display disk usage

Question 2

A junior administrator needs to create a new Ext4 file system on the device /dev/sdb1. Which command should be used?

Accepted Answer

mkfs.ext4 /dev/sdb1. The `mkfs.ext4` command is the standard utility for creating an ext4 filesystem on a block device. It formats the partition with the ext4 journaling filesystem, writing the superblock, inode table, and journal metadata. Option D is correct because it directly invokes the mke2fs program with the ext4 filesystem type.

Answer

fdisk /dev/sdb1

Answer

parted /dev/sdb1

Answer

tune2fs /dev/sdb1

Answer

fsck /dev/sdb1

Question 3

A system administrator needs to extend an existing logical volume 'lv_data' in volume group 'vg_data'. The administrator has already added a new physical volume /dev/sdd1 to the volume group. Which sequence of commands should be used to complete the extension and ensure the filesystem is usable?

Accepted Answer

lvextend -L +10G /dev/vg_data/lv_data; resize2fs /dev/vg_data/lv_data. After adding a physical volume to the volume group, the logical volume must be extended with `lvextend`, and then the filesystem must be resized with `resize2fs` to use the new space. The filesystem remains mounted and usable throughout; no remount or filesystem recreation is needed.

Answer

lvextend -L +10G /dev/vg_data/lv_data; mount /dev/vg_data/lv_data; resize2fs /dev/vg_data/lv_data

Answer

lvextend -L +10G /dev/vg_data/lv_data; mkfs.ext4 /dev/vg_data/lv_data

Answer

lvresize -L +10G /dev/vg_data/lv_data; fsck /dev/vg_data/lv_data

Answer

vgextend vg_data /dev/sdd1; lvextend -L +10G /dev/vg_data/lv_data; resize2fs /dev/vg_data/lv_data

Question 4

A logical volume 'lv_share' in volume group 'vg_share' has no free extents. The administrator needs to increase the size of '/dev/vg_share/lv_share' by 5 GB. There is another logical volume 'lv_archive' in the same volume group that has 10 GB free space within its filesystem. What must the administrator do to allocate space from 'lv_archive' to 'lv_share'?

Accepted Answer

Reduce the filesystem on 'lv_archive' with resize2fs, then reduce the logical volume with lvreduce, then extend 'lv_share'.. You must first shrink the filesystem on 'lv_archive' using resize2fs (or e2fsck -f / resize2fs) to free space within the filesystem, then reduce the logical volume with lvreduce to release the underlying physical extents back to the volume group. Only after those steps can you extend 'lv_share' with lvextend and then resize its filesystem. This sequence ensures data integrity and avoids filesystem corruption.

Answer

Shrink the filesystem on 'lv_archive' to free space, then use vgsplit to move the space to 'lv_share'.

Answer

Use lvreduce directly on 'lv_archive' without changing the filesystem, then lvextend on 'lv_share'.

Answer

Use lvresize to reduce 'lv_archive' and extend 'lv_share' in one command.

Answer

Add a new physical volume to the volume group instead.

Question 5

During boot, a custom application fails because the /data file system is not mounted. Upon investigation, the administrator sees an error 'UUID=abc123 not found' in the logs. Which command should the administrator use to correct the /etc/fstab entry?

Accepted Answer

blkid /dev/sdb1. The error 'UUID=abc123 not found' indicates that the /etc/fstab entry for /data references a UUID that does not match any block device. The administrator needs to find the correct UUID of the actual partition (e.g., /dev/sdb1) and update the fstab entry. The `blkid /dev/sdb1` command displays the UUID (and filesystem type) of that specific device, allowing the administrator to copy the correct UUID into /etc/fstab.

Answer

mount -a

Answer

xfs_info /dev/sdb1

Answer

fdisk -l /dev/sdb1

Answer

lsblk -f /dev/sdb1

Question 6

An administrator needs to enable swap on a newly created partition /dev/sdc1. Which two commands should be executed in order?

Accepted Answer

mkswap /dev/sdc1; swapon /dev/sdc1. Enabling swap on a new partition requires first formatting it as swap space with `mkswap`, then activating it with `swapon`. The `mkswap` command writes a swap signature to the partition, and `swapon` enables the kernel to use it as swap. Without `mkswap`, the partition lacks the proper swap filesystem structure and cannot be used for swapping.

Answer

mkswap /dev/sdc1; mount /dev/sdc1

Answer

swapon /dev/sdc1; mkswap /dev/sdc1

Answer

swapon /dev/sdc1; mount /dev/sdc1

Answer

mkfs.swap /dev/sdc1; swapon /dev/sdc1

Question 7

A company policy requires that all new logical volumes be created with a physical extent size of 16 MiB to optimize performance for large sequential I/O. During the creation of a new volume group, what parameter should be used?

Accepted Answer

vgcreate -s 16M vg_data /dev/sdc1. The `-s` parameter in `vgcreate` sets the physical extent (PE) size for the volume group. A PE size of 16 MiB is specified with `-s 16M`, which ensures all subsequent logical volumes in that VG use 16 MiB extents, optimizing performance for large sequential I/O by reducing metadata overhead.

Answer

vgcreate -p 16M vg_data /dev/sdc1

Answer

vgcreate -L 16M vg_data /dev/sdc1

Answer

vgcreate -e 16M vg_data /dev/sdc1

Answer

vgcreate -c 16M vg_data /dev/sdc1

Question 8

An administrator is configuring an NFS mount in /etc/fstab to mount from server:/export to /mnt/data. The mount must use the 'hard' and 'nosuid' options. Which line is correct?

Accepted Answer

server:/export /mnt/data nfs nosuid,hard 0 0. It specifies the NFS filesystem type and includes both required mount options: 'nosuid' (disallows set-user-identifier/set-group-identifier bits) and 'hard' (retries NFS requests indefinitely until the server responds). The syntax follows the correct /etc/fstab format: :/ .

Answer

server:/export /mnt/data nfs defaults,noexec,nodev 0 0

Answer

server:/export /mnt/data nfs nosuid,hard,defaults 0 0

Answer

server:/export /mnt/data ext4 defaults 0 0

Answer

server:/export /mnt/data nfs suid,soft 0 0

Question 9

Which command can be used to display a list of all currently mounted filesystems on a Linux system?

Accepted Answer

mount. The `mount` command with no arguments displays a list of all currently mounted filesystems, showing the device, mount point, filesystem type, and mount options. This is the standard and most direct way to view active mounts on a Linux system.

Answer

fdisk -l

Answer

lsblk -m

Answer

cat /proc/filesystems

Answer

df -a

Question 10

A system has two logical volumes in the same volume group: 'lv_prod' (100% used) and 'lv_backup' (20% used). The administrator wants to allocate 5 GiB from 'lv_backup' to 'lv_prod' without unmounting any filesystems. Is this possible and why?

Accepted Answer

No, because ext4 filesystems cannot be shrunk online; they must be unmounted.. Ext4 filesystems do not support online shrinking; they must be unmounted before reducing the logical volume. Since the administrator wants to shrink lv_backup (which is only 20% used) to free 5 GiB, the ext4 filesystem on that LV must be unmounted first. Without unmounting, the lvreduce operation would fail, making the scenario impossible as described.

Answer

Yes, use lvreduce and lvextend while mounted; ext4 supports online shrinking.

Answer

No, because LVM does not allow freeing extents from an LV while it is active.

Answer

Yes, use lvresize to move extents between LVs directly.

Question 11

Which TWO of the following commands can be used to create an XFS filesystem on a block device?

Accepted Answer

mkfs.xfs /dev/sdb1. The `mkfs.xfs` command (option B) directly creates an XFS filesystem on a block device. The `mkfs -t xfs` command (option E) is the generic front-end that calls the same XFS-specific tool, making both valid. These are the standard methods for formatting a partition with the XFS filesystem in Red Hat Enterprise Linux.

Answer

mkfs.ext4 /dev/sdb1

Answer

xfs_admin /dev/sdb1

Answer

mke2fs /dev/sdb1

Question 12

Which TWO LVM commands can be used to reduce the size of a logical volume?

Accepted Answer

lvresize. Both `lvresize` and `lvreduce` can reduce the size of a logical volume. `lvresize` is the general-purpose command for resizing LVs, and when used with the `-L` or `--size` option to specify a smaller size, it shrinks the volume. `lvreduce` is a dedicated command that specifically reduces the size of a logical volume, offering the same functionality as `lvresize --size` but with a more explicit name. Both commands require the filesystem to be shrunk first (if it contains data) using tools like `resize2fs` or `xfs_growfs` (though XFS cannot be shrunk).

Answer

lvchange

Answer

lvdisplay

Answer

lvextend

Question 13

Which THREE of the following mount options are commonly used to enhance security on a filesystem?

Accepted Answer

nosuid. The `nosuid` option prevents the set-user-identifier (setuid) and set-group-identifier (setgid) bits from taking effect on the filesystem. This blocks unprivileged users from executing binaries with elevated privileges, a common vector for privilege escalation attacks.

Answer

suid

Answer

defaults

Question 14

Based on the exhibit, which mount point is mounted with the 'noexec' option?

Accepted Answer

/tmp. The /tmp mount point is configured with the 'noexec' option, as shown in the exhibit (e.g., in /etc/fstab or the output of mount or findmnt). This prevents execution of binaries directly from the /tmp filesystem, which is a common security hardening practice to mitigate the risk of attackers running malicious scripts or binaries from a world-writable directory.

Answer

/data

Answer

/

Answer

/var

Answer

/boot

Question 15

Based on the exhibit, how much free space is available in the volume group vg00?

Accepted Answer

19.98 GiB. The VG free space is calculated from the total number of Physical Extents (PEs) and the PE size. The output shows 5115 PEs and a PE size of 4.00 MiB, so total free space = 5115 × 4 MiB = 20460 MiB = 19.98 GiB (since 20460 ÷ 1024 = 19.98046875). No Logical Volumes are allocated, so all PEs are free. Option B (10235 MiB) is exactly half of 20470 MiB, a common miscalculation. Option C (20.00 GiB) is the raw PV size, ignoring the PE overhead. Option D (19.99 GiB) is a rounding error. Option E (5115 MiB) confuses the PE count with the free space in MiB.

Answer

10235 MiB

Answer

20.00 GiB

Answer

19.99 GiB

Answer

5115 MiB