Leading CompTIA Linux+ Certification Exam XK0-004 Exam Answers

NEW QUESTION 1
A technical support engineer receives a ticket from a user who is trying to create a 1KB file in the /tmp directory and is getting the following error No space left on device. The support engineer checks the /tmp directory, and it has 20GB of free space.
Which of the following BEST describes a possible cause for this error?

• A. The /tmp directory is not mounted.
• B. The filesystem is formatted with a 4MB block size.
• C. the filesystem ran out of inodes.
• D. The /tmp directory has been set with an immutable attribute.

Answer: C

NEW QUESTION 2
A Linux administrator built a GitLab server. Later that day, a software engineer tried to access the server to upload the repository during the final step of installation. The software engineer could not access the website. Which of the following firewall rules would allow access to this site?

• A. iptables –A INPUT –p tcp –m multiport --dports 80,443 –m conntrack –cstate NEW, ESTABLISHED –j ACCEPT
• B. iptables –A INPUT –p tcp –m multiport --dports 80,443 –m conntrack –cstate ESTABLISHED –j ACCEPT
• C. iptables –A INPUT –p tcp –m multiport --dports 80,443 –m conntrack –cstate RELATED, ESTABLISHED –j ACCEPT
• D. iptables –A INPUT –p tcp –m multiport --dports 80,443 –m conntrack –cstate NEW, ESTABLISHED –j REJECT

Answer: C

NEW QUESTION 3
A systems administrator wants to know the current status of a series of dd jobs that were started in the background three hours ago.
Which of the following commands will achieve this task?

• A. sudo killall –HUP dd
• B. sudo killall dd
• C. sudo killall –TERM dd
• D. sudo killall -USR1 dd

Answer: D

NEW QUESTION 4
A Linux administrator has configured a Linux system to be used as a router. The administrator confirms that two network adapters are properly installed and functioning correctly. In addition, the output of the iptables –L command appears to contain a complete firewall configuration.
Which of the following commands does the administrator need to issue for the router to be fully functional?

• A. echo “1” > /proc/sys/net/ipv4/ip_forward
• B. echo “0” > /proc/sys/net/ipv4/tcp_abort_on_overflow
• C. echo “0” > /proc/sys/net/ipv4/max_connections
• D. echo “1” > /proc/sys/net/ipv4/ip_default_ttl

Answer: A

NEW QUESTION 5
An administrator is tasked with increasing the size of the volume /dev/vg/lv to 20GB. Which of the following BEST illustrates the steps the administrator should take?

• A. vgextend –L20G /dev/vg/lv; resizelv /dev/vg/lv
• B. parted –L20G /dev/vg/lv; remount /dev/vg/lv
• C. mkfs –L20G /dev/vg/lv; tune2fs /dev/vg/lv
• D. lvextend –L20G /dev/vg/lv; resize2fs /dev/vg/lv

Answer: D

NEW QUESTION 6
A systems administration team has decided to their systems as immutable instances. They keep the desired state of each of their systems in version control and apply automation whenever they provision a new instance. If there is an issue with one of their servers, instead of troubleshooting the issue they terminate the instance and rebuild it using automation.
Which of the following is this an example of?

• A. Inventory
• B. Orchestration
• C. Infrastructure as code
• D. Agentless deployment

Answer: C

NEW QUESTION 7
A systems administrator is enabling quotas on the /home directory of a Linux server. The administrator makes the appropriate edits to the /etc/fstab file and attempts to issue the commands to enable quotas on the desired directory. However, the administrator receives an error message stating the filesystem does not support quotas. Which of the following commands should the administrator perform to proceed?

• A. mount –o remount /home
• B. quotacheck -cg
• C. edquota /home
• D. quotaon /home

Answer: D

NEW QUESTION 8
A junior Linux administrator is updating local name resolution to support IPv6. The administrator issues the command cat /etc/hosts and receives the following output: 127.1.1.1 localhost
Which of the following actions should the administrator perform to accomplish this task?

• A. Modify the /etc/hosts file, and add the ipv6 localhost entry to the file.
• B. Modify the /etc/hosts file, and add the ::1 localhost entry to the file.
• C. Modify the /etc/hosts file, and add the ipv4 localhost entry to the file.
• D. Modify the /etc/hosts file, and add the 0.0.0.0 localhost entry to the file.

Answer: D

NEW QUESTION 9
A junior systems administrator is creating a cron job. The cron job requirements are as follows: Run the hello.sh script every hour (24 times in one day).
Run it on Monday only.
Given this scenario, which of the following crontab options should be configured to meet these requirements?

• A. 0 *** 1 hello.sh
• B. 0 24 ** Monday hello.sh
• C. 24 *** Monday hello.sh
• D. 1 *** 0 hello.sh

Answer: C

NEW QUESTION 10
Which of the following BEST describes running on a Linux system?

• A. Containers only need the namespaces functionally to run on a Linux system available since kernel 2.6.
• B. Containers need a hypervisor to run a Linux syste
• C. Cgroups namespaces are functionalities used for the kernel but not for running containers.
• D. Containers only need the cgroups functionality for running on a Linux syste
• E. Namespaces is not a Linux kernel functionality needed for creating and managing containers.
• F. Containers use the cgroups and namespaces functionalities to isolate processes and assign hardware resources to each of those isolated processes.

Answer: D

NEW QUESTION 11
Which of the following configuration management tools is considered agentless?

• A. Ouppet
• B. Salt
• C. Ansible
• D. Chef

Answer: C

NEW QUESTION 12
A user attempts to use the mount -a command but gets the following error: mount: mount point /mnt/test does not exist
Which of the following commands best describes the action the Linux administrator should take NEXT?

• A. mount –a /mnt/test
• B. mkdir –p /mnt/test
• C. mdadm –p /mnt/test
• D. mkfs /mnt/test
• E. touch /mnt/test

Answer: B

NEW QUESTION 13
A junior Linux administrator is optimizing a system in which an application needs to take priority 0 when running the process. The administrator runs the ps command and receives the following output:

Given this scenario, which of the following steps will address this issue?

• A. Issue the command ronice –n 0 –p 8481
• B. Issue the command renice –p 8481
• C. Issue the command renice –p 0 ~n 8481
• D. Issue the command renice –n 8481

Answer: D

NEW QUESTION 14
A Linux administrator installed a new network adapter and temporarily disabled the network service from starting on boot. The partial output of chkconfig is as follows:

Which of the following commands BEST describes how the administrator should re-enable the network service?

• A. chkconfig --level 0 network on
• B. chkconfig --level 0-6 network on
• C. chkconfig --level 6 network on
• D. chkconfig --level 12 network on
• E. chkconfig --level 345 network on

Answer: E

NEW QUESTION 15
A Linux administration is using a Linux system as a router. During the tests, the administrator discovers that IP packets are not being sent between the configured interfaces.
Which of the following commands enables this feature for IPv4 networks?

• A. cat /proc/sys/net/ipv4/ip_route > 1
• B. echo “1” > /proc/sys/net/ipv4/ip_forward
• C. echo “1” > /proc/sys/net/ipv4/ip_route
• D. echo “1” > /proc/sys/net/ipv4/ip_net

Answer: B

NEW QUESTION 16
An administrator has written the following Bash script:

All necessary files exist in the correct locations. However, when the administrator executes /home/user/test.sh the following error is received:
No such file or directory
Which of the following is the MOST likely cause of the error?

• A. The shebang points to the wrong path.
• B. The script is not executable.
• C. The formatting of the file is incorrect.
• D. Nslookup is not installed.

Answer: A

NEW QUESTION 17
A system administrator has set up third-party log aggregation agents across several cloud instances. The systems administrator wants to create a dashboard of failed SSH attempts and the usernames used.
Which of the following files should be watched by the agents?

• A. /var/log/audit/audit.log
• B. /var/log/kern.log
• C. /var/log/monitor
• D. /etc/rsyslog.conf

Answer: D

NEW QUESTION 18
A Linux server needs to be accessed, but the root password is not available.
Which of the following would BEST allow an administrator to regain access and set a new known password at the same time?

• A. Boot into a single-user mode and reset the password via the passwd command.
• B. Boot into a single-user mode and reset the password by editing the /etc/passwd file.
• C. Boot into a single-user mode and reset the password by editing the /etc/shadow file.
• D. Boot into a single-user mode and reset the password via the chage command.

Answer: A

NEW QUESTION 19
An administrator is attempting to block SSH connections to 192.168.10.24 using the Linux firewall. After implementing a rule, a connection refused error is displayed when attempting to SSH to 192.168.10.24.
Which of the following rules was MOST likely implemented?

• A. iptables –A –p tcp –d 192.168.10.24 –dropt 22 –j REJECT
• B. iptables –A –p tcp –d 192.168.10.24 –dropt 22 –j DROP
• C. iptables –A –p tcp –d 192.168.10.24 –dropt 22 –j FORWARD
• D. iptables –A –p tcp –d 192.168.10.24 –dropt 22 –j REFUSE

Answer: A

NEW QUESTION 20
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