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Free PDF 2025 CompTIA XK0-005 Latest Latest Dumps Free

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CompTIA XK0-005, also known as the CompTIA Linux+ Certification Exam, is a certification exam designed for IT professionals seeking to demonstrate their skills and knowledge of Linux operating systems. As an industry-recognized certification, the CompTIA Linux+ certification validates the expertise of IT professionals in managing, configuring, and troubleshooting Linux systems.

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CompTIA Linux+ Certification Exam Sample Questions (Q668-Q673):

NEW QUESTION # 668
A systems administrator installed a new software program on a Linux server. When the systems administrator tries to run the program, the following message appears on the screen.

Which of the following commands will allow the systems administrator to check whether the system supports virtualization?

A. lscpu
B. dmidecode -s system-version
C. sysctl -a
D. cat /sys/device/system/cpu/possible

Answer: A

Explanation:
The command that will allow the systems administrator to check whether the system supports virtualization is lscpu. This command will display information about the CPU architecture, such as the number of CPUs, cores, sockets, threads, model name, frequency, cache size, and flags. One of the flags is vmx (for Intel processors) or svm (for AMD processors), which indicates that the CPU supports hardware virtualization. If the flag is present, it means that the system supports virtualization. If the flag is absent, it means that the system does not support virtualization or that it is disabled in the BIOS settings.
The other options are not correct commands for checking whether the system supports virtualization. The dmidecode -s system-version command will display the version of the system, such as the product name or serial number, but not the CPU information. The sysctl -a command will display all the kernel parameters, but not the CPU flags. The cat /sys/devices/system/cpu/possible command will display the range of possible CPUs that can be online or offline, but not the CPU features. References: lscpu(1) - Linux manual page; How To Check If Virtualization is Enabled in Windows 10 / 11

NEW QUESTION # 669
The application team has reported latency issues that are causing the application to crash on the Linux server. The Linux administrator starts troubleshooting and receives the following output:

Which of the following commands will improve the latency issue?

A. # echo 'net.core.net_backlog = 5000000' >> /etc/sysctl.conf
# sysctl -p
# systemctl daemon-reload
B. # ifdown eth0
# ip link set dev eth0 mtu 800
# ifup eth0
C. # echo 'net.core.rmem_max = 12500000' >> /etc/sysctl.conf
# echo 'net.core.wmem_max = 12500000' >> /etc/sysctl.conf
# sysctl -p
D. # systemctl stop network
# ethtool -g eth0 512
# systemctl start network

Answer: C

Explanation:
The best command to use to improve the latency issue is D. # echo `net.core.rmem max =
12500000' >> /etc/sysctl.conf # echo `net.core.wmem_max = 12500000' >> /etc/sysctl.conf # sysctl -p. This command will increase the size of the receive and send buffers for the network interface, which can improve the network performance and reduce packet loss. The sysctl command will apply the changes to the kernel parameters without rebooting the system. The other commands are either incorrect or not suitable for this task.

NEW QUESTION # 670
A systems administrator needs to disable root login for SSH. Which of the following commands should the administrator use?

A. sed -i 's/PermitRootLogin yes/PermitRootLogin no/' /etc/ssh/sshd_config
B. touch /etc/ssh/sshd_config | awk 's/PermitRootLoginX yes/PermitRootLoginX no/'
C. touch /etc/ssh/sshd_config | print* 1PermitRootLogin/PermitRootLogin no/'
D. cat /etc/ssh/sshd_config | grep 's/PermitRootLogin yes/PermitRootLogin no/'

Answer: A

Explanation:
Todisable root login over SSH, modify the /etc/ssh/sshd_config file using:
bash
sed -i 's/PermitRootLogin yes/PermitRootLogin no/' /etc/ssh/sshd_config Then restart the SSH service:
bash
systemctl restart sshd
* Options A, C, and D are invalid or syntactically incorrect.
* Only B makes a valid and permanent configuration change.
Reference:CompTIA Linux+ XK0-005 Official Study Guide, Domain 3.2 - Implement authentication and authorization
"To harden SSH, edit /etc/ssh/sshd_config and set PermitRootLogin no."

NEW QUESTION # 671
A user receives an access_denied error when trying to modify a file, even though the file permissions are set to 777. Which of the following commands should be used to view additional file permissions?

A. ps -z
B. getenforce
C. ls -z
D. getsebool

Answer: C

NEW QUESTION # 672
A systems administrator is enabling LUKS on a USB storage device with an ext4 filesystem format. The administrator runs dmesg and notices the following output:

Given this scenario, which of the following should the administrator perform to meet these requirements?
(Select three).

A. cryptsetup IuksFormat /dev/ sdcl
B. umount / dev/ sdc
C. wipefs -a/dev/sdbl
D. gpg /dev/sdcl
E. pvcreate /dev/sdc
F. fdisk /dev/sdc
G. mkfs . ext4 /dev/mapper/LUKSCJ001 - L ENCRYPTED
H. mkfs . vfat /dev/mapper/LUKS0001 - L ENCRYPTED

Answer: A,B,G

Explanation:
Explanation
To enable LUKS on a USB storage device with an ext4 filesystem format, the administrator needs to perform the following steps:
Unmount the device if it is mounted using umount /dev/sdc (D)
Create a partition table on the device using fdisk /dev/sdc (E)
Format the partition with LUKS encryption using cryptsetup luksFormat /dev/sdc1 (H) Open the encrypted partition using cryptsetup luksOpen /dev/sdc1 LUKS0001 Create an ext4 filesystem on the encrypted partition using mkfs.ext4 /dev/mapper/LUKS0001 Mount the encrypted partition using mount /dev/mapper/LUKS0001 /mnt References:
[CompTIA Linux+ Study Guide], Chapter 9: Securing Linux, Section: Encrypting Disks
[How to Encrypt USB Drive on Ubuntu 18.04]

NEW QUESTION # 673
......

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