XK0-006 Practice Test 7 — 10 Questions

Question 1

Which TWO statements are true regarding the use of Ansible for automation? (Choose TWO.)

Accepted Answer

Ansible playbooks are written in YAML.. Option B is correct because Ansible playbooks are defined in YAML, a human-readable data serialization format that describes tasks, plays, and roles executed by the Ansible engine. Option C is correct because Ansible is agentless: it does not require any software installed on managed nodes and communicates over standard SSH (or WinRM for Windows hosts) to push modules and execute tasks. Option A is incorrect because Ansible can run from any control machine, including a laptop or a CI runner, and does not mandate a dedicated master server. Option D is incorrect because Ansible uses a push-based model, where the control node pushes playbooks/modules to targets, not a pull model like Puppet or Chef agents. Option E is incorrect because Ansible modules are written in Python (or any language returning JSON), not Ruby.

Answer

Ansible requires a dedicated master server to manage nodes.

Answer

Ansible uses a pull-based model where nodes fetch configurations from a central server.

Answer

Ansible modules are written in Ruby.

Question 2

A security audit reveals that an SELinux boolean 'httpd_can_network_connect' is currently off, but a web application requires Apache to connect to a database server. Which command should the administrator use to enable this boolean persistently?

Accepted Answer

setsebool -P httpd_can_network_connect on. The command 'setsebool -P httpd_can_network_connect on' is correct because setsebool modifies SELinux booleans at runtime, and the -P flag makes the change persistent across reboots by writing it to the policy store. This enables Apache to initiate network connections to the database server as required.

Answer

setenforce 1

Answer

setsebool httpd_can_network_connect 1

Answer

getsebool httpd_can_network_connect

Question 3

A server running RHEL 8 fails to boot with a 'Dependency failed for /data' error. The /data filesystem is an ext4 partition on /dev/sdb1. Which sequence of steps should be taken to repair the filesystem?

Accepted Answer

Boot into rescue mode, run 'umount /dev/sdb1', then 'fsck.ext4 -f /dev/sdb1'. To repair an ext4 filesystem that failed to mount at boot, you must boot into rescue mode (or single-user), ensure the filesystem is unmounted, then run 'fsck.ext4 -f /dev/sdb1' to force a check and repair. fsck must never run on a mounted read-write filesystem, and rescue mode gives you a clean environment where /data is not mounted. This is the standard RHEL recovery procedure.

Answer

Use 'xfs_repair /dev/sdb1' since it's ext4

Answer

Run 'fsck.ext4 -f /dev/sdb1' from the running system

Answer

Remount the filesystem as read-only and run fsck

Question 4

A technician wants to check the disk I/O statistics, focusing on the average I/O wait time and utilization percentage. Which command provides this information?

Accepted Answer

iostat -x. The iostat -x command displays extended disk I/O statistics, including per-device metrics such as average wait time (await), utilization percentage (%util), and queue sizes. The -x flag is specifically what surfaces these extended columns, making it the correct tool for analyzing I/O wait and utilization. sar -b reports overall block device activity but not per-device extended metrics like await and %util.

Answer

sar -b

Answer

vmstat -d

Answer

free -h

Question 5

An administrator runs 'systemctl list-units' and sees that httpd.service is in a failed state. To quickly see the error message that caused the failure, which command should be used?

Accepted Answer

systemctl status httpd.service. The `systemctl status httpd.service` command displays the current state of the service, including the most recent log entries from the journal that show the error messages causing the failure. This is the quickest way to see the failure reason without filtering or additional options, as it directly outputs the relevant error lines from the service's unit.

Answer

systemctl show httpd.service -p ExecMainStatus

Answer

journalctl -p err -u httpd.service

Answer

systemd-analyze blame

Question 6

A systems administrator writes a Bash script named 'backup.sh' and wants it to run with the Bash shell. Which line should appear first in the script?

Accepted Answer

#!/bin/bash. The shebang line `#!/bin/bash` is required as the first line to instruct the operating system to execute the script using the Bash shell interpreter located at `/bin/bash`. Without this line, the script may be run by a different shell (e.g., `/bin/sh`), leading to syntax or behavior differences. The shebang must start with `#!` followed by the absolute path to the interpreter.

Answer

# This is a bash script

Answer

#/bin/bash

Answer

#!/bin/sh

Question 7

A technician has just performed system maintenance and wants to verify that the server has been running continuously for the past 30 days. Which command should the technician use?

Accepted Answer

uptime. The `uptime` command displays how long the system has been running since the last boot, including the current time, number of logged-in users, and load averages. By checking the output, the technician can verify if the server has been running continuously for the past 30 days (e.g., 'up 30 days'). This directly answers the question without querying logs or processes.

Answer

systemctl status rsyslog

Answer

ps aux

Answer

date

Question 8

A Linux administrator is tasked with adding a new 1TB hard drive to a server. The drive has been partitioned and formatted with ext4, resulting in the device /dev/sdb1. The administrator needs the drive to be mounted persistently at /data. After adding an entry to /etc/fstab, the administrator runs 'mount -a' and sees the error: 'mount: /data: mount point does not exist.' Which of the following should the administrator do first to resolve the issue?

Accepted Answer

Create the /data directory with mkdir. The error 'mount point does not exist' indicates that the directory /data has not been created on the filesystem. The mount command requires an existing directory to attach the device to. Creating the /data directory with mkdir resolves this, allowing mount -a to succeed.

Answer

Run mkfs.ext4 on /dev/sdb1

Answer

Reboot the server

Answer

Run fsck on /dev/sdb1

Question 9

After a system update, a custom application no longer runs due to a shared library error. The library exists on the system but is in a non-standard path. Which environment variable should be checked or set to resolve this?

Accepted Answer

LD_LIBRARY_PATH. The LD_LIBRARY_PATH environment variable tells the dynamic linker (ld.so) where to search for shared libraries before the standard system paths. When a custom application fails with a shared library error after an update, and the library exists in a non-standard path, setting LD_LIBRARY_PATH to include that path resolves the issue by allowing the linker to find the library at runtime.

Answer

LD_PRELOAD

Answer

PATH

Answer

LD_RUN_PATH

Question 10

A Linux administrator notices that the system’s disk I/O performance has degraded significantly. Running 'iostat -x 1' shows high %util values on /dev/sda, but low await. Which of the following is the most likely issue?

Accepted Answer

There are many concurrent I/O requests (high queue depth).. High %util with low await indicates that the device is busy processing many concurrent I/O requests, but each request completes quickly. This is characteristic of a high queue depth where the disk is saturated with parallel requests, not that individual requests are slow. The low await confirms that the disk itself is responding fast, so the bottleneck is the volume of simultaneous I/O, not latency per request.

Answer

The filesystem is nearly full.

Answer

The disk cable is loose or faulty.

Answer

The disk is failing and needs replacement.