XK0-006 Practice Test 2 — 10 Questions

Question 1

A bash script needs to test whether a string variable $NAME is non-empty and equals 'admin'. Which of the following conditionals is correct?

Accepted Answer

if [[ -n $NAME && $NAME == 'admin' ]]; then. In bash, [[ -n $NAME ]] tests if the string is non-empty, and == compares strings. Using double brackets is safer for string comparison.

Answer

if [[ $NAME -ne '' && $NAME -eq 'admin' ]]; then

Answer

if [ $NAME != '' ] && [ $NAME == 'admin' ]; then

Answer

if [ ! -z $NAME -a $NAME = 'admin' ]; then

Question 2

A process is consuming excessive CPU and needs to be terminated immediately. The PID is 1234. Which command will terminate the process with the most forceful signal?

Accepted Answer

kill -9 1234. kill -9 (SIGKILL) forcibly terminates the process. SIGTERM (15) is graceful; SIGHUP (1) reloads config; SIGSTOP (19) suspends.

Answer

kill -15 1234

Answer

kill -1 1234

Answer

kill -19 1234

Question 3

An administrator runs the commands shown in the exhibit. The container is accessible via curl using the container IP. However, the administrator cannot access the web server using the host's IP address on port 80. What is the most likely cause?

Accepted Answer

The container's port 80 is not published to the host.. The administrator ran `docker run -d nginx` without the `-p` or `--publish` flag, which means port 80 inside the container is not mapped to any port on the host. The container is accessible via its own IP because Docker networking allows direct container-to-container communication, but the host's IP on port 80 remains unbound, so curl to the host IP fails. Publishing the port with `-p 80:80` would expose the container's port 80 on the host's interface.

Answer

The container's IP address is incorrect.

Answer

Nginx is configured to listen on a different port.

Answer

The container is not running.

Question 4

Drag and drop the steps to configure SELinux to allow a custom web application to listen on port 8080 in the correct order.

Accepted Answer

List current SELinux port mappings, then add port 8080 to http_port_t, then verify the new mapping, then restart the web service. SELinux requires adding the port to the appropriate context before the service can listen.

Answer

Add port 8080 to http_port_t, then list current mappings, then verify, then restart

Answer

List current mappings, then verify, then add port, then restart

Answer

Add port 8080 to http_port_t, then verify, then list, then restart

Question 5

Which command displays the current SELinux mode?

Accepted Answer

sestatus. The 'sestatus' command displays the current SELinux mode, including whether it is enforcing, permissive, or disabled, along with other SELinux status information.

Answer

selinuxenabled

Answer

getsebool -a

Answer

chcon

Question 6

A user reports that a specific process is consuming too much CPU. The administrator needs to change the priority of the process to a lower value (nicer). Which command sequence is appropriate?

Accepted Answer

renice +10 -p <PID>. renice changes the priority of an already running process by PID.

Answer

nice -n -10 <PID>

Answer

kill -15 <PID>

Answer

chrt --idle <PID>

Question 7

During the boot process, after the kernel is loaded and the initramfs is executed, which component is responsible for starting the user-space services and managing the system state?

Accepted Answer

systemd. Systemd is the init system that starts services and manages targets. GRUB2 is the bootloader that loads the kernel. The kernel itself initializes hardware. Initramfs is an initial root filesystem used to load drivers.

Answer

initramfs

Answer

GRUB2

Answer

Kernel

Question 8

A technician is troubleshooting a service that fails to start at boot. Which systemctl command should be used to ensure the service starts automatically on subsequent boots?

Accepted Answer

systemctl enable service. systemctl enable creates symlinks so the service starts at boot. The status shown by is-enabled confirms if it is enabled.

Answer

systemctl mask service

Answer

systemctl start service

Answer

systemctl reenable service

Question 9

Which command is used to display the contents of the systemd journal for a specific unit?

Accepted Answer

journalctl -u. journalctl -u unitname displays logs for the specified systemd unit.

Answer

systemctl status unit

Answer

dmesg

Answer

journalctl -f

Question 10

Refer to the exhibit. An API call returns HTTP 200 but an empty body. What is the most likely cause?

Accepted Answer

The request is missing required query parameters, such as pagination or filters.. An HTTP 200 response indicates the request reached the server and was processed successfully, so the issue is not connectivity or server failure. An empty body most commonly occurs when the API requires query parameters such as pagination, filters, or a specific resource identifier, and without them the endpoint returns a valid but empty result set.

Answer

The server is experiencing a network timeout.

Answer

The SSL certificate is expired or invalid.

Answer

The API endpoint has been moved permanently (301).