EX200 Practice Test 9 — 10 Questions

Question 1

Consider the script in the exhibit. The script is run in a directory containing 'a.txt' and 'b.txt' but also has a subdirectory 'backup' with .txt files. What will be the output?

Accepted Answer

Line counts for 'a.txt' and 'b.txt' only. The script uses `for i in *.txt`, which by default only matches .txt files in the current directory, not in subdirectories. Since 'a.txt' and 'b.txt' are in the current directory, the loop iterates over them and runs `wc -l` on each, outputting their line counts. The 'backup' subdirectory is not traversed because the glob pattern does not include paths with directories.

Answer

An error because the for loop cannot iterate over files with spaces

Answer

Line counts for .txt files in 'backup' only

Answer

Line counts for all .txt files including those in 'backup'

Question 2

A system administrator needs to create a file system on a new 10GB partition /dev/sdb1 for use with a database that requires high reliability and supports snapshots. Which file system type should be chosen?

Accepted Answer

xfs. XFS is the correct choice because it is a high-performance, 64-bit journaling file system that supports snapshots via LVM or external tools, and is designed for large files and partitions. For a database requiring high reliability and snapshot capabilities, XFS provides robust data integrity features and is the default file system in Red Hat Enterprise Linux 8 and later, making it the recommended option for this scenario.

Answer

ext4

Answer

vfat

Answer

btrfs

Question 3

A user reports that they cannot create files in their home directory. The administrator checks permissions and sees drwxr-xr-x. What is the likely cause?

Accepted Answer

The user is not the owner of the directory. The permissions `drwxr-xr-x` mean the owner has read, write, and execute (rwx) access, while group and others have only read and execute (r-x). Since the user cannot create files (which requires write permission), the user must not be the owner of the directory. Only the owner (or root) can write to it, so the likely cause is that the user is not the owner.

Answer

The directory has the sticky bit set

Answer

The filesystem is read-only

Answer

The user is not in the group

Question 4

A container named 'web1' was created and ran briefly before exiting with status 0. The administrator needs to restart it and attach to the running container's console. Which command should be used?

Accepted Answer

podman start web1 && podman attach web1. `podman start web1` restarts the existing container that exited with status 0, and `podman attach web1` connects the current terminal to the container's main process console. The `&&` ensures the attach runs only after the container is successfully started, allowing the administrator to interact with the running container's console.

Answer

podman run --name web1 -it registry.access.redhat.com/ubi8/httpd-24

Answer

podman start web1

Answer

podman restart web1 && podman attach web1

Question 5

Refer to the exhibit. The /proc/mdstat output shows a RAID1 array with two devices. One of the disks (/dev/sda1) fails. Which sequence of commands would be used to remove the failed disk and add a new replacement disk /dev/sdc1?

Accepted Answer

mdadm /dev/md0 --fail /dev/sda1; mdadm /dev/md0 --remove /dev/sda1; mdadm /dev/md0 --add /dev/sdc1. It uses the proper mdadm syntax with the device name immediately after the command, followed by the action and the disk. The --fail flag marks the disk as faulty, --remove removes it from the array, and --add adds the new replacement disk. This sequence ensures the array remains in a degraded state before safely replacing the failed component.

Answer

mdadm --fail /dev/md0 /dev/sda1; mdadm --remove /dev/md0 /dev/sda1; mdadm --add /dev/md0 /dev/sdc1

Answer

mdadm /dev/md0 --set-faulty /dev/sda1; mdadm /dev/md0 --remove /dev/sda1; mdadm /dev/md0 --add /dev/sdc1

Answer

mdadm /dev/md0 --remove /dev/sda1; mdadm /dev/md0 --add /dev/sdc1

Answer

mdadm /dev/md0 --replace /dev/sda1 --with /dev/sdc1

Question 6

A server has a software RAID 5 array /dev/md0. One of its disks fails. The administrator wants to replace it without rebooting. Which command should be used to mark the disk as failed?

Accepted Answer

mdadm --fail /dev/md0 /dev/sdb. The correct command to mark a disk as failed in a software RAID array without rebooting is `mdadm --fail /dev/md0 /dev/sdb`. This command tells the md driver to mark the specified disk as faulty, which triggers the RAID 5 array to degrade and allows the failed disk to be removed and replaced while the system remains online.

Answer

mdadm --fault /dev/md0 /dev/sdb

Answer

echo faulty > /sys/block/md0/md/dev-sdb/state

Answer

mdadm --set-faulty /dev/md0 /dev/sdb

Question 7

An administrator needs to add a 1GB swap partition on /dev/sdd1. Which series of commands accomplishes this?

Accepted Answer

fdisk /dev/sdd, create partition, then mkswap /dev/sdd1, swapon /dev/sdd1, and add to /etc/fstab.. It includes all necessary steps: first create the partition with fdisk (since /dev/sdd1 does not exist yet), then format it as swap with mkswap, activate it with swapon, and finally add an entry to /etc/fstab to ensure persistence across reboots. The other options omit the critical partition creation step or fail to make the swap permanent.

Answer

mkswap /dev/sdd1 && echo '/dev/sdd1 swap swap defaults 0 0' >> /etc/fstab

Answer

mkfs.swap /dev/sdd1 && swapon /dev/sdd1

Answer

mkswap /dev/sdd1 && swapon /dev/sdd1

Question 8

A server has an LVM volume group vg01 with a physical volume /dev/sdb. The administrator wants to move all physical extents from /dev/sdb to /dev/sdd which is also in the same volume group. Which command sequence is correct?

Accepted Answer

pvmove /dev/sdb; vgreduce vg01 /dev/sdb. The correct sequence is to first use `pvmove /dev/sdb` to relocate all physical extents from /dev/sdb to other physical volumes in the same volume group (vg01), and then use `vgreduce vg01 /dev/sdb` to remove the now-empty physical volume from the volume group. This ensures no data loss and that the volume group metadata is properly updated.

Answer

vgreduce vg01 /dev/sdb; pvmove

Answer

pvmove /dev/sdb; pvremove /dev/sdb

Answer

pvmove /dev/sdb /dev/sdd

Question 9

A system fails to boot and drops into an emergency shell. The administrator suspects a misconfigured /etc/fstab. Which command should be used to determine which filesystem is causing the boot issue?

Accepted Answer

journalctl -xb -p err. When a system fails to boot due to a misconfigured /etc/fstab, the emergency shell is entered. The `journalctl -xb -p err` command displays the systemd journal from the current boot (`-b`) with extended information (`-x`) and filters for error-level messages (`-p err`). This will show the exact mount failure and the offending filesystem entry, making it the correct diagnostic tool.

Answer

systemctl status local-fs.target

Answer

fsck -A

Answer

mount -a

Question 10

Refer to the exhibit. Which entry is most likely to cause the system to fail to boot if the NFS server is unavailable?

Accepted Answer

The fourth entry (/mnt). The /mnt entry in /etc/fstab is configured with the default mount options, which include the _netdev option being absent. Without _netdev, the system will attempt to mount the NFS filesystem during the boot process before the network is fully operational. If the NFS server is unavailable, the mount will fail, and because the default mount behavior for non-root filesystems in /etc/fstab is to cause a boot failure if the mount fails (unless the 'nofail' option is specified), the system will drop into emergency mode and fail to complete the boot process.

Answer

The third entry (/home)

Answer

The second entry (/boot)

Answer

The first entry (/)