EX200 Practice Test 20 — 15 Questions

Question 1

Refer to the exhibit. An administrator needs to create a new logical volume named 'data' of size 3GB. Which command should be used?

Accepted Answer

lvcreate -n data -L 3G vg01. The `lvcreate` command with `-n data` names the logical volume 'data', `-L 3G` sets its size to 3 gigabytes, and `vg01` specifies the volume group that contains the physical volumes. This matches the requirement exactly, assuming the volume group `vg01` exists and has sufficient free extents.

Answer

lvcreate -n data -L 3G vg00

Answer

lvcreate -n data -L 3G /dev/sda1

Answer

lvcreate -n data -l 100 vg01

Answer

lvcreate -n data -l 100 vg00

Question 2

A security policy requires user passwords to expire 60 days after last change. Which command sets this for user 'jdoe'?

Accepted Answer

chage -M 60 jdoe. The `chage -M 60 jdoe` command sets the maximum number of days a password is valid for user 'jdoe' to 60 days. The `-M` flag in `chage` directly controls the password expiration period, counting from the last password change, which matches the security policy requirement.

Answer

usermod -f 60 jdoe

Answer

passwd -x 60 jdoe

Answer

chage -m 60 jdoe

Question 3

You are a system administrator for a small company. The development team has created a shell script named 'deploy.sh' that automates deployment of a web application. The script is located at /home/devops/deploy.sh. The team reports that when they run the script with './deploy.sh' from the /home/devops directory, it fails with a 'Permission denied' error. However, running 'bash deploy.sh' works fine. Additionally, the script's first line is '#!/bin/bash' and the file permissions are '-rw-rw-r--'. The team wants to be able to run the script directly without typing 'bash'. Which of the following actions should you take to resolve the issue?

Accepted Answer

Add the execute permission to the script using 'chmod +x /home/devops/deploy.sh'.. The 'Permission denied' error when running './deploy.sh' indicates that the script lacks execute permission. The current permissions '-rw-rw-r--' show read/write for owner and group, and read-only for others, but no execute bit. Adding execute permission with 'chmod +x' allows the script to be run directly via its shebang line.

Answer

Change the shebang line to '#!/bin/sh' because bash is not the default shell.

Answer

Move the script to /usr/local/bin so it can be found in the PATH.

Answer

Change the owner of the script to root using 'chown root:root /home/devops/deploy.sh'.

Question 4

A system administrator receives alerts that the /var/log partition is 100% full. The partition is on /dev/mapper/vg_log-lv_var_log, formatted with XFS, and is mounted at /var/log. The volume group vg_log has 10GB of free space available. The administrator runs the command `lvextend -L +10G /dev/mapper/vg_log-lv_var_log` successfully, but then `df -h` still shows 100% full. What is the next step the administrator should take to use the newly added space?

Accepted Answer

Run xfs_growfs /var/log. After extending the logical volume with `lvextend`, the underlying block device has more space, but the XFS filesystem does not automatically recognize it. The correct next step is to run `xfs_growfs /var/log` to expand the filesystem to fill the newly available space. Unlike ext4, XFS cannot be resized while mounted with `resize2fs`; it requires the XFS-specific `xfs_growfs` command, which can operate on a mounted filesystem.

Answer

Run resize2fs /dev/mapper/vg_log-lv_var_log

Answer

Reboot the system to remount the filesystem

Answer

Run fsck /dev/mapper/vg_log-lv_var_log

Question 5

Which command displays the current working directory?

Accepted Answer

pwd. The `pwd` command stands for 'print working directory' and is the standard Linux/Unix command to display the absolute path of the current directory. It is part of the GNU Core Utilities and is the correct tool for this task in the Red Hat Enterprise Linux environment tested in EX200.

Answer

ls

Answer

dir

Answer

cd

Question 6

Refer to the exhibit. An administrator is unable to write to /tmp because the filesystem is full. What is the most likely cause?

Accepted Answer

The root filesystem is nearly full at 90% usage. The exhibit shows that the root filesystem (/) is at 90% usage, while /tmp is not a separate filesystem but a directory under the root. Since /tmp resides on the root filesystem, when the root filesystem is nearly full, there is no space left for writing to /tmp, causing the write failure.

Answer

The /tmp is a separate filesystem

Answer

There is a filesystem quota enabled

Answer

The /boot partition is too small

Question 7

Which file should be present in a directory to build a container image using 'podman build'?

Accepted Answer

Dockerfile (or Containerfile). The `podman build` command requires a Dockerfile or Containerfile in the build context directory to define the container image layers and instructions. Podman follows the OCI (Open Container Initiative) image specification and uses the Dockerfile format by default, making option C the only correct choice for building an image.

Answer

docker-compose.yml

Answer

container.json

Answer

.dockerignore

Question 8

A backup script uses tar to create an archive, but the administrator wants to exclude the /tmp directory from the backup. Which tar option should be added?

Accepted Answer

--exclude=/tmp. The `--exclude=PATTERN` option in tar tells the command to skip files or directories matching the given pattern. By specifying `--exclude=/tmp`, the tar archive will omit the /tmp directory and all its contents, which is exactly what the administrator needs for the backup script.

Answer

--ignore-failed-read

Answer

--exclude-from=/tmp

Answer

-X /tmp

Question 9

A company policy requires that when a user is deleted, all files owned by that user in /home should be reassigned to a 'guest' account. Which command accomplishes this?

Accepted Answer

find /home -user olduser -exec chown guest {} +. Uses `find` to locate all files owned by `olduser` under `/home` and then executes `chown guest` on them, which reassigns ownership to the `guest` account. This directly satisfies the policy requirement without affecting the user account itself or copying files.

Answer

usermod -l guest olduser

Answer

userdel -r olduser

Answer

rsync -a /home/olduser/ /home/guest/

Question 10

An administrator needs to compress a directory 'data' into an archive named backup.tar.gz using gzip compression. Which command should they use?

Accepted Answer

tar -czf backup.tar.gz data. The `tar -czf` command creates a compressed archive: `-c` creates a new archive, `-z` filters the archive through gzip compression, `-f` specifies the archive filename `backup.tar.gz`, and `data` is the directory to archive. This produces a tarball compressed with gzip, matching the requirement exactly.

Answer

gzip -r data > backup.tar.gz

Answer

tar -cjf backup.tar.gz data

Answer

tar -xzf backup.tar.gz data

Question 11

A volume group vg_data has no free extents. An admin adds a new disk /dev/sdc and wants to extend the logical volume lv_data (ext4 filesystem) by 5GB. Which sequence of commands is correct?

Accepted Answer

pvcreate /dev/sdc → vgextend vg_data /dev/sdc → lvextend -L+5G /dev/vg_data/lv_data → resize2fs /dev/vg_data/lv_data. It follows the proper sequence: first create the physical volume with pvcreate, then extend the volume group with vgextend, then extend the logical volume with lvextend, and finally resize the ext4 filesystem with resize2fs. Since the filesystem is ext4, the resize2fs command is required after lvextend to make the additional space available to the filesystem.

Answer

pvcreate /dev/sdc → vgextend vg_data /dev/sdc → lvextend -L+5G /dev/vg_data/lv_data

Answer

lvextend -L+5G /dev/vg_data/lv_data → pvcreate /dev/sdc → vgextend vg_data /dev/sdc

Answer

fdisk /dev/sdc → mkfs.ext4 /dev/sdc1 → pvcreate /dev/sdc1 → vgextend vg_data /dev/sdc1 → lvextend -L+5G /dev/vg_data/lv_data

Question 12

A technician needs to create a new group named 'developers' with GID 5000. Which command accomplishes this?

Accepted Answer

groupadd -g 5000 developers. The `groupadd -g 5000 developers` command explicitly sets the GID to 5000 for the new group named 'developers'. The `-g` option specifies the numeric group ID, which is required to meet the technician's exact requirement.

Answer

groupadd -r developers

Answer

useradd -g developers

Answer

groupadd developers

Question 13

Which three of the following are valid methods to view the manual page for the 'ls' command? (Choose three)

Accepted Answer

man ls. The 'man' command is the primary method for viewing manual pages in Linux. Running 'man ls' displays the full manual page for the 'ls' command, including its description, options, and usage details.

Answer

help ls

Answer

whatis ls

Question 14

A container fails to start because the port it needs is already in use. Which command can the administrator use to identify the process using the port?

Accepted Answer

ss -tlnp. The `ss -tlnp` command displays listening TCP sockets (`-t`), numeric addresses (`-n`), and the associated process information (`-p`). This allows the administrator to identify which process (PID and program name) is bound to a specific port, directly addressing the container startup failure caused by a port conflict.

Answer

podman logs <container>

Answer

podman port -l

Answer

firewall-cmd --list-ports

Question 15

You are managing a Red Hat Enterprise Linux 9 server that hosts a critical database application. The database stores its data on an XFS filesystem mounted on /data, backed by a logical volume in a volume group named vg_db. Recently, the database team reported that write operations are failing with 'Disk quota exceeded' errors, but the filesystem still shows 40% free space. You check the filesystem quota configuration and find that no user or group quotas are set on /data. The database runs as user 'dbadmin' with group 'dba'. Which of the following is the most likely cause of the 'Disk quota exceeded' error?

Accepted Answer

An XFS project quota is configured on the /data directory, limiting the space used by the database files.. XFS project quotas can limit the total space used by a directory tree, regardless of the user or group that owns the files. Even though no user or group quotas are set, a project quota on /data restricts the database files, causing 'Disk quota exceeded' errors despite 40% free space on the filesystem.

Answer

The logical volume is thin provisioned and the data pool is full.

Answer

SELinux is blocking the database writes due to a denial.

Answer

The filesystem has run out of inodes.