EX200 Deploy, configure, and maintain systems Practice Test 4 — 15 Questions

Question 1

Which three of the following are required steps to create a new logical volume of 5GB in an existing volume group 'vg00'?

Accepted Answer

Create a logical volume with lvcreate. `lvcreate` is the command used to create a new logical volume within an existing volume group. For a 5GB volume in vg00, the command would be `lvcreate -L 5G -n lvname vg00`. This step is mandatory to allocate the logical volume from the free extents in the volume group.

Answer

Create a physical volume

Answer

Create a volume group

Question 2

Which two statements are true regarding network teaming (teamd) compared to bonding?

Accepted Answer

Teaming supports more advanced features like load balancing and link monitoring. Teaming (teamd) provides advanced features such as IEEE 802.3ad load balancing, active-backup, and LACP support, along with more sophisticated link monitoring (e.g., ARP ping, NSNA) compared to the older bonding driver. Teaming uses the libteam library to offer a modular and extensible architecture, which is why option E is also correct.

Answer

Teaming must be configured manually with configuration files only

Answer

Bonding is deprecated in RHEL 8

Answer

Bonding does not support active-backup mode

Question 3

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 4

An administrator needs to create a 10GB logical volume named 'mylv' in an existing volume group 'vg1', format it with XFS, and mount it at /mnt/data. Which set of commands achieves this correctly?

Accepted Answer

lvcreate -n mylv -L 10G vg1 && mkfs.xfs /dev/vg1/mylv && mount /dev/vg1/mylv /mnt/data && echo "/dev/vg1/mylv /mnt/data xfs defaults 0 0" >> /etc/fstab. It uses the proper `lvcreate` syntax with `-n` for name and `-L` for size, creates the logical volume `/dev/vg1/mylv`, formats it with XFS, mounts it, and appends the correct fstab entry using `>>` to avoid overwriting existing entries. The device path `/dev/vg1/mylv` is the standard LVM device mapper path for a logical volume named 'mylv' in volume group 'vg1'.

Answer

lvcreate -n mylv -L 10G vg1 && mkfs.xfs /dev/vg1/mylv && mount /dev/vg1/mylv /mnt/data && blkid /dev/vg1/mylv >> /etc/fstab

Answer

lvcreate -n mylv -L 10G vg1 && mkfs.xfs /dev/vg1/mylv && mount /dev/vg1/mylv /mnt/data && echo "/dev/vg1/mylv /mnt/data xfs defaults 0 0" > /etc/fstab

Answer

lvcreate -n mylv --size 10G vg1 && mkfs.xfs /dev/mylv && mount /dev/mylv /mnt/data && echo "/dev/mylv /mnt/data xfs defaults 0 0" >> /etc/fstab

Question 5

A web server running Apache (httpd) on RHEL 9 serves content from /var/www/custom. Clients get a 403 error. The SELinux context on files is system_u:object_r:default_t:s0. Which command resolves the issue persistently without disabling SELinux?

Accepted Answer

semanage fcontext -a -t httpd_sys_content_t "/var/www/custom(/.*)?" && restorecon -R /var/www/custom. It uses `semanage fcontext` to add a persistent file context rule for `/var/www/custom` and its contents, then applies it with `restorecon`. This ensures the `httpd_sys_content_t` type is set persistently across file system relabeling, resolving the 403 error caused by the default SELinux type (`default_t`) that denies Apache access.

Answer

chcon -t httpd_sys_content_t /var/www/custom

Answer

setsebool -P httpd_enable_custom on

Answer

restorecon -R /var/www/custom

Question 6

A system administrator wants to permanently allow incoming HTTP traffic on RHEL 9 using firewalld. Which two commands will achieve this? (Choose two.)

Accepted Answer

firewall-cmd --add-port=80/tcp --permanent. Both B and E directly add the rule to the permanent configuration. D also works: `firewall-cmd --add-service=http` adds the service to the runtime configuration, and `firewall-cmd --runtime-to-permanent` saves that runtime change to the permanent configuration. Thus D achieves the same persistent result. The original answer key is incorrect because it omits D.

Answer

firewall-cmd --add-service=http

Answer

firewall-cmd --runtime-to-permanent

Question 7

A developer deploys a container using podman with a bind mount to persist web content. They run: podman run -d --name web -v /webdata:/usr/local/apache2/htdocs:Z -p 8080:80 httpd:latest. The container fails to start. The journal shows SELinux denials for the httpd process inside the container trying to read files with context httpd_sys_content_t, while the process runs in container_t domain. The host directory /webdata exists and contains index.html. The administrator checks that the container image is standard. What is the most likely cause of the failure?

Accepted Answer

The podman command should use :z instead of :Z.. The `:Z` flag in the bind mount tells Podman to relabel the host directory with a private SELinux context (`container_file_t`) unique to that container, which prevents other containers from accessing it. However, the SELinux denial shows the httpd process inside the container (running in `container_t` domain) cannot read files labeled `httpd_sys_content_t` (the default label for web content on the host). Using `:z` instead of `:Z` would relabel the directory with the shared context `container_file_t`, allowing the container process to read the files while still enforcing SELinux policy.

Answer

The SELinux context on /webdata is incorrect for container use.

Answer

The /webdata directory does not exist.

Answer

The container image is incompatible with the host SELinux policy.

Question 8

A RHEL 9 system has a second disk /dev/sdb that needs to be partitioned with a single partition using all space, formatted with XFS, and mounted persistently at /data. The administrator uses fdisk to create the partition /dev/sdb1. Which filesystem creation command should be used?

Accepted Answer

mkfs.xfs /dev/sdb1. The correct command is mkfs.xfs /dev/sdb1 because the question specifies that the partition must be formatted with XFS. The mkfs.xfs command is the dedicated tool for creating an XFS filesystem on a block device. It directly invokes the mkfs.xfs utility, which writes the XFS superblock and metadata structures to the partition.

Answer

mke2fs /dev/sdb1

Answer

mkfs -t ext4 /dev/sdb1

Answer

mkfs.ext4 /dev/sdb1

Question 9

Refer to the exhibit. The administrator wants to add an additional 5GB to the /mnt/data filesystem. There is no unpartitioned space on /dev/sdb. Which is the correct procedure?

Accepted Answer

Use fdisk to delete and recreate /dev/sdb1 with larger size, run partprobe, then xfs_growfs /mnt/data.. The filesystem on /mnt/data is XFS (as shown in the exhibit), and XFS cannot be shrunk; it can only be grown. Since there is no unpartitioned space on /dev/sdb, the partition itself must be resized. The correct procedure is to delete and recreate the partition with a larger size using fdisk, inform the kernel of the change with partprobe, and then grow the XFS filesystem with xfs_growfs /mnt/data.

Answer

Use resize2fs /dev/sdb1 to expand filesystem.

Answer

Add a new disk, create a physical volume, extend volume group, and extend logical volume.

Answer

Use fdisk to delete and recreate /dev/sdb1 with larger size, then mount.

Question 10

A system administrator needs to ensure that a web server running Apache httpd starts automatically after a system reboot. Which command should the administrator use to enable the httpd service?

Accepted Answer

systemctl enable httpd. `systemctl enable httpd` creates the necessary symlinks in the systemd unit configuration directories (e.g., `/etc/systemd/system/multi-user.target.wants/`) to ensure the httpd service starts automatically at boot. This is the standard method for enabling a service in a Red Hat Enterprise Linux 8/9 environment using systemd.

Answer

systemctl daemon-reload

Answer

systemctl start httpd

Answer

systemctl reenable httpd

Question 11

An administrator needs to configure a service to start automatically at boot and also start it immediately without rebooting. Which single command accomplishes both tasks?

Accepted Answer

systemctl enable --now httpd.service. `systemctl enable --now httpd.service` combines the `enable` action (creating symlinks for automatic start at boot) with the `start` action (immediately launching the service) in a single command. This is the precise method in systemd to achieve both goals without rebooting.

Answer

systemctl start httpd.service

Answer

systemctl enable httpd.service

Answer

systemctl reenable httpd.service

Question 12

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 13

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 14

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 15

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 (/)