EX200 Multiple Select — 10 Questions

Question 1

Which TWO commands can be used to display available disk space on mounted filesystems in a human-readable format?

Accepted Answer

df -h. The `df -h` command displays disk space usage for mounted filesystems, with the `-h` flag converting sizes into human-readable units (e.g., KB, MB, GB). This directly meets the requirement of showing available disk space on mounted filesystems in a human-readable format. The `du -sh` command shows the total disk usage of a specific directory or file, not available space on filesystems, so it does not satisfy the question's requirement.

Answer

blkid

Answer

ls -lh

Answer

du -sh

Answer

fdisk -l

Question 2

Which TWO commands can be used to add a user to a secondary group without removing existing supplementary group memberships? (Choose exactly 2)

Accepted Answer

usermod -aG group user. `usermod -aG` appends the user to the specified supplementary group(s) without affecting any existing supplementary group memberships. The `-a` flag (append) must be used with `-G` to avoid overwriting the current list of supplementary groups. This is the standard method in Red Hat Enterprise Linux for adding a user to an additional group while preserving all other group memberships.

Answer

usermod -AG group user

Answer

adduser user group

Answer

groupadd -a user group

Question 3

Which TWO commands are valid for resizing an XFS file system? (Choose exactly two.)

Accepted Answer

xfs_growfs /mnt. `xfs_growfs` is the dedicated command for resizing (growing) an XFS file system while it is mounted. It expands the file system to fill the available space in the underlying device or logical volume, making it the primary tool for XFS resizing operations.

Answer

xfs_admin -L /mnt

Answer

resize2fs /dev/sda1

Answer

xfs_repair /dev/sda1

Question 4

An administrator wants to change the default systemd target to multi-user.target. Which three steps are part of a correct procedure? (Choose three.)

Accepted Answer

systemctl isolate multi-user.target. `systemctl isolate multi-user.target` immediately switches the current systemd target to multi-user.target, which is the correct way to change the active target at runtime without a reboot. This command stops all units not required by the new target and starts those that are, effectively changing the system's operational state.

Answer

systemctl enable multi-user.target

Answer

systemctl start multi-user.target

Question 5

A systems administrator needs to list all currently defined firewall rules in firewalld, including rules for all zones. Which TWO commands can be used to accomplish this? (Choose exactly two.)

Accepted Answer

firewall-cmd --list-all-zones. `firewall-cmd --list-all-zones` displays the firewall rules for every zone in firewalld, including all default and custom zones, satisfying the requirement to list rules for all zones. Option E is incorrect because `firewall-cmd --list-all` only shows rules for the default zone, not all zones. The other options are incorrect: `iptables -L` shows raw kernel rules that may not reflect firewalld's configuration, `systemctl status firewalld` checks the service status, and `firewall-cmd --get-default-zone` shows only the default zone name, not rules.

Answer

iptables -L

Answer

systemctl status firewalld

Answer

firewall-cmd --get-default-zone

Answer

firewall-cmd --list-all

Question 6

Which TWO of the following are valid ways to make a shell script executable?

Accepted Answer

chmod 755 script.sh. Options B and D are both valid ways to make a shell script executable. Option B uses numeric mode to set execute permission for the owner, while option D uses symbolic mode to add execute for the owner only. Option E is also valid but is not one of the two answers required by the question.

Answer

bash script.sh

Answer

. script.sh

Answer

chmod +x script.sh

Question 7

Which TWO commands can change the primary group of an existing user?

Accepted Answer

usermod -aG. None of the listed commands change the primary group of an existing user. The correct commands are `usermod -g` to change the primary group directly, or `groupmod -g` after ensuring the user is the only member of the group.

Answer

vigr

Answer

groupmems -a

Answer

useradd -G

Question 8

Which three fields are present in every /etc/fstab entry? (Choose three.)

Accepted Answer

Mount point. Every /etc/fstab entry consists of six whitespace-separated fields: device, mount point, filesystem type, options, dump, and pass. Although dump and pass can be omitted and default to 0, the dump field is considered present in every entry due to its default value. The question asks for three fields that are present in every entry; these include the mount point (A), device (B), and dump field (C). The filesystem type (D) is also present, but the question requires exactly three choices, and the dump field is often overlooked. UUID (E) is not a separate field; it is a method to specify the device.

Answer

Filesystem type

Answer

UUID

Question 9

Which command can be used to create a logical volume using all available free space in a volume group?

Accepted Answer

lvcreate -l 100%FREE -n lvdata vgdata. The `-l 100%FREE` flag allocates all unallocated physical extents in the volume group, which is the precise way to use all available free space. Option D (`-l 100%VG`) is incorrect because it attempts to allocate 100% of the volume group's extents, including those already used by other logical volumes, causing the command to fail if any extents are already allocated. Therefore, only option B is correct.

Answer

lvcreate --size 20G vgdata lvdata

Answer

lvcreate -L 20G -n lvdata vgdata

Answer

lvcreate -l 100%VG -n lvdata vgdata

Answer

lvcreate -L 100%FREE -n lvdata vgdata

Question 10

Which TWO commands can be used to display the current date and time in a format like '2023-10-05 14:30:00'?

Accepted Answer

date '+%Y-%m-%d %H:%M:%S'. The `date` command with the format string `'+%Y-%m-%d %H:%M:%S'` explicitly outputs the current date and time in the requested 'YYYY-MM-DD HH:MM:SS' format. Option D (`date -Iseconds`) outputs date and time in ISO 8601 format (e.g., 2023-10-05T14:30:00+00:00) with a 'T' separator and timezone, not the requested format. Therefore, only option A is correct.

Answer

cal

Answer

timedatectl

Answer

date -Iseconds

Answer

hwclock