Down To Date XK0-004 Training Materials 2021

NEW QUESTION 1
Which of the following is modified to reconfigure the boot environment?

• A. grub-mkconfig
• B. grub.cfg
• C. update-grub
• D. grub2-mkconfig

Answer: C

NEW QUESTION 2
An administrator notices that a long-running script, /home/user/script.sh, is taking up a large number of system resources. The administrator does not know the script’s function. Which of the following commands should the administrator use to minimize the script’s impact on system resources?

• A. renice
• B. kill
• C. bg
• D. nohup

Answer: A

NEW QUESTION 3
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 4
A configuration management tool running every minute is enforcing the service HTTPd to be started. To perform maintenance, which of the following series of commands can be used to prevent the service from being started?

• A. systemctl stop httpd && systemctl mask httpd
• B. systemctl disable httpd && systemctl mask httpd
• C. systemctl stop httpd && systemctl hide httpd
• D. systemctl disable httpd && systemctl hide httpd

Answer: A

NEW QUESTION 5
A Linux systems administrator needs to provision multiple web servers into separate regional datacenters. The systems architect has instructed the administrator to define the server infrastructure using a specific tool that consumes a text-based file.
Which of the following is the BEST reason to do this?

• A. To document the infrastructure so it can be included in the system security plan
• B. To ensure the administrator follows the planning phase of the system development life cycle
• C. To define the infrastructure so it can be provisioned consistently with minimal manual tasks
• D. To validate user requirements have been met within each regional datacenter for compliance

Answer: B

NEW QUESTION 6
A Linux administrator needs to switch from text mode to GUI. Which of the following runlevels will start the GUI by default?

• A. Runlevel 3
• B. Runlevel 4
• C. Runlevel 5
• D. Runlevel 6

Answer: C

NEW QUESTION 7
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 8
A junior administrator of a physical server receives log messages indicating the out-of-memory killer has been active. All memory slots are in use on the motherboard, but additional disk space is available. Space has been allocated for a swap file.
Which of the following should the administrator use to reduce the output of memory messages?

• A. free : swapoff / swapfile ; swapon -a
• B. mkswap /swapfile; swapon –a
• C. fallocate –l 2G /swapfile && swapon –a
• D. echo “1” > /proc/meninfo ; swapon / swapfile

Answer: A

NEW QUESTION 9
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 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
A user has connected a Bluetooth mouse to a computer, but it is not working properly. Which of the following commands should the systems administrator use to fix the issue?

• A. lsmod –i bluetooth
• B. insmod bluetooth
• C. modprobe –r bluetooth
• D. depmod –i bluetooth

Answer: C

NEW QUESTION 12
A junior administrator needs to unload an older video kernel module. Which of the following commands would BEST accomplish this task?

• A. modprobe
• B. insmod
• C. rmmod
• D. chmod

Answer: A

NEW QUESTION 13
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 14
Which of the following is the purpose of the vmlinux file on a Linux system?

• A. To prevent a Linux kernel panic
• B. To start a Linux virtual machine
• C. To provide the executable kernel for the system
• D. To enable resource access to the network

Answer: C

NEW QUESTION 15
After starting a long-running script, a systems administrator needs to verify the frequency of what is filling up the /var partition and kill it because it is consuming too much space.
Which of the following is the correct sequence given only a terminal is available?

• A. 1. CTRL-C2. bg3. watch df /var4. CTRL-C5. fg6. CTRL-Z
• B. 1. CTRL-C2. fg3. watch df /var4. CTRL-Z5. bg6. CTRL-Z
• C. 1. CTRL-Z2. bg3. watch df /var4. CTRL-C5. fg6. CTRL-C
• D. 1. CTRL-Z2. bg3. watch df /var4. CTRL-Z5. fg6. CTRL-C

Answer: D

NEW QUESTION 16
Two specific users need access to a directory owned by root where backups are located. Which of the following commands would BEST ensure the specified users can access the backup files?

• A. umask
• B. chcon
• C. chmod
• D. setfacl

Answer: D

NEW QUESTION 17
Which of the following server roles would assign a host IP address?

• A. DHCP
• B. NTP
• C. DNS
• D. SSH

Answer: A

NEW QUESTION 18
An administrator needs to deploy 100 identical CentOS workstations via PXE boot. Which of the following should the administrator use to minimize the amount of interaction with the consoles needed?

• A. Kickstart script
• B. Ghost image on a distribution server
• C. Hard disk duplicator
• D. Hard disk duplicator
• E. Ubiquity script

Answer: A

NEW QUESTION 19
A junior Linux administrator is setting up system-wide configuration settings. The goal is to ensure the PATH environment variable includes the following locations for all users who log into a Linux system.

The administrator issues the following commands at the terminal:

Respectively, the output of these commands is as follows:

Given this output, which of the following would be the BEST action for the administrator to perform to address this issue?

• A. Update the /etc/profile.d file using a text editor, navigate to the PATH element add the missing locations, and run the bash_completion.sh script to update the changes.
• B. Update the /etc/profile file using a text editor, navigate to the PATH element, add the missing locations and run the . /etc/profile command to update the changes.
• C. Update the /etc/profile.d file using a text editor, navigate to the PATH element, add the missing locations, and reboot to update the changes.
• D. Update the /etc/profile file using a text editor navigate to the PATH element, add the missing locations, and restart the bash process to update the changes.

Answer: B

NEW QUESTION 20
An operator finds a user is having issues with opening certain files.
Which of the following commands would allow the security administrator to list and check the SELinux context?

• A. ls –D
• B. ls –a
• C. ls –Z
• D. ls -1

Answer: C

NEW QUESTION 21
A Linux administrator needs to schedule a cron job to run at 1:15 p.m. every Friday to report the amount of free disk space on the system and to send the output to a file named “freespace”. Which of the following would meet this requirement?

• A. 13 15 * * 5 df > /freespace
• B. 15 13 * * 5 df > /freespace
• C. 15 1 * * 6 df > /freespace
• D. 15 13 6 * * df > /freespace

Answer: A

NEW QUESTION 22
A networked has been crashing intermittently. A Linux administrator would like to write a shell script that will attempt to ping the server and email an alert if the server fails to respond. The script will later be scheduled via cron job.
Which of the following scripts would BEST accomplish this task?

• A. Option A
• B. Option B
• C. Option C
• D. Option D

Answer: D

NEW QUESTION 23
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