EX200 Practice Test 8 — 10 Questions

Question 1

Based on the exhibit, which command should be used to start the container named 'mycontainer'?

Accepted Answer

podman start mycontainer. The correct command to start an existing but stopped container is 'podman start mycontainer'. 'podman start' resumes a container that has been created (via 'podman create') or previously stopped, without creating a new instance. Option D is correct because it directly addresses the requirement to start the container named 'mycontainer' that already exists.

Answer

podman attach mycontainer

Answer

podman restart mycontainer

Answer

podman run mycontainer

Question 2

A cron job fails to run. Which command should the administrator use to verify the cron daemon is active?

Accepted Answer

systemctl status crond. On RHEL-based systems (including Red Hat Enterprise Linux, CentOS, and Fedora), the cron daemon is named `crond`, not `cron`. The `systemctl status crond` command checks whether the `crond` service is active, enabled, and running. This is the correct method for verifying the cron daemon's status on systems using systemd.

Answer

systemctl status cron

Answer

systemctl list-units --type=service

Answer

service crond status

Question 3

A user wants to run a container that will restart automatically unless explicitly stopped by the administrator. Which podman run option should be used?

Accepted Answer

--restart=unless-stopped. The `--restart=unless-stopped` policy ensures the container restarts automatically whenever it exits, unless the administrator explicitly stops it with `podman stop`. This matches the requirement exactly: the container will keep restarting even after system reboots or crashes, but will not restart if the admin manually stops it. The other policies either do not restart on manual stop (`always`) or only restart on non-zero exit codes (`on-failure`).

Answer

--restart=on-failure

Answer

--restart=always

Answer

--restart=no

Question 4

An administrator wants to add an additional swap partition of 2GB on device /dev/sdb1. Which set of commands should be used to enable swap and make it persistent across reboots?

Accepted Answer

mkswap /dev/sdb1; swapon /dev/sdb1; echo '/dev/sdb1 swap swap defaults 0 0' >> /etc/fstab. It follows the proper sequence to prepare and activate a swap partition on /dev/sdb1. First, `mkswap` initializes the partition as a swap area by writing a swap signature. Then `swapon` activates it immediately. Finally, adding an entry to /etc/fstab ensures the swap is automatically enabled at boot, making it persistent across reboots.

Answer

parted /dev/sdb set 1 swap on

Answer

swapadd /dev/sdb1

Answer

mkfs.ext4 /dev/sdb1; mount /dev/sdb1 /swap

Answer

None of the above

Question 5

A system fails to boot because of a corrupted fstab file. The administrator boots into rescue mode from a RHEL installation ISO. Which command should be run first to mount the root filesystem read-write?

Accepted Answer

mount /dev/mapper/rhel-root /mnt/sysimage. In rescue mode, the root filesystem is not mounted by default. The first step is to mount the logical volume containing the root filesystem (e.g., /dev/mapper/rhel-root) to a temporary mount point like /mnt/sysimage so that you can access and repair the corrupted /etc/fstab file. Option A correctly uses the mount command with the device and mount point, which is the standard procedure for RHEL rescue environments.

Answer

mount -o rw,remount /sysroot

Answer

chroot /mnt/sysimage

Answer

systemctl rescue

Question 6

A junior system administrator configures rsyslog on a RHEL 9 server to forward logs to a remote centralized log server. They add the line *.* @192.168.1.100:514 to /etc/rsyslog.conf and restart rsyslog with systemctl restart rsyslog. Local logging works fine, but the remote server does not receive any logs. The administrator checks the local firewall and confirms that UDP port 514 is open outbound. They also verify network connectivity using nc. What is the most likely cause?

Accepted Answer

The SELinux boolean rsyslog_remote is disabled, blocking outbound syslog.. On RHEL 9, SELinux enforces a targeted policy that blocks rsyslog from making outbound network connections by default. The boolean `rsyslog_remote` controls this behavior; when disabled, SELinux denies the outbound syslog traffic even though the local firewall allows it. The administrator must enable this boolean with `setsebool -P rsyslog_remote on` to allow rsyslog to forward logs via UDP or TCP.

Answer

The systemd unit for rsyslog is masked, preventing it from running.

Answer

The remote rsyslog server is not listening on UDP port 514.

Answer

The configuration should use @@ for TCP instead of @ for UDP.

Question 7

Refer to the exhibit. What is the most likely cause of this failure?

Accepted Answer

Another process is already bound to port 22.. The error message in the exhibit indicates that the sshd service failed to start because port 22 is already in use. This is a classic port conflict, where another process (e.g., another SSH daemon, a web server misconfigured to use port 22, or a leftover process) has bound to the same TCP port. The system log or `ss -tlnp` would show the PID and name of the conflicting process, confirming that port 22 is unavailable for the new sshd instance.

Answer

The sshd service is not enabled.

Answer

SELinux is blocking the service.

Answer

The /etc/ssh/sshd_config file is missing.

Question 8

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 9

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 10

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