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100% Pass 2026 CompTIA XK0-005: Pass-Sure Free CompTIA Linux+ Certification Exam Test Questions

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CompTIA Linux+ certification is an excellent way to showcase your skills and knowledge in Linux administration. It is an internationally recognized certification that can help you advance your career in information technology. By passing the CompTIA XK0-005 Exam, you can demonstrate your proficiency in Linux administration and show employers that you have the necessary skills to manage and maintain Linux systems.

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CompTIA Linux+ certification exam comprises of 90 multiple-choice and performance-based questions. XK0-005 exam is designed to test the candidate's knowledge and skills in various areas of Linux-based systems. XK0-005 Exam is available in English, Japanese, and Portuguese, and candidates are given 90 minutes to complete it. To pass the exam, candidates must score a minimum of 720 out of 900.

CompTIA Linux+ Certification Exam Sample Questions (Q628-Q633):

NEW QUESTION # 628
An administrator recently updated the BIND software package and would like to review the default configuration that shipped with this version. Which of the following files should the administrator review?

A. /etc/bind/bind.conf
B. /etc/named.conf
C. /etc/named.conf.rpmnew
D. /etc/named.conf.rpmsave

Answer: B

NEW QUESTION # 629
A Linux administrator is troubleshooting SSH connection issues from one of the workstations.
When users attempt to log in from the workstation to a server with the IP address 104.21.75.76, they receive the following message:

The administrator reviews the information below:

Which of the following is causing the connectivity issue?

A. The server has an incorrect default gateway configuration.
B. The sshd service is disabled.
C. The server's firewall is preventing connections from being made.
D. The workstation has the wrong IP settings.

Answer: C

Explanation:
Explanation
The server's firewall is preventing connections from being made, which is causing the connectivity issue. The output of iptables -L -n shows that the firewall is blocking all incoming traffic on port 22, which is the default port for SSH. The output of ssh -v user@104.21.75.76 shows that the connection is refused by the server. To resolve the issue, the administrator needs to allow port 22 on the firewall. The other options are incorrect because they are not supported by the outputs. The workstation has the correct IP settings, as shown by the output of ip addr show. The sshd service is enabled and running, as shown by the output of systemct1 status sshd. The server has the correct default gateway configuration, as shown by the output of ip route show. References: CompTIA Linux+ (XK0-005) Certification Study Guide, Chapter 13: Managing Network Services, pages 406-407.

NEW QUESTION # 630
An administrator transferred a key for SSH authentication to a home directory on a remote server. The key file was moved to .ssh/authorized_keys location in order to establish SSH connection without a password.
However, the SSH command still asked for the password. Given the following output:

Which of the following commands would resolve the issue?

A. chmod 600 .ssh/authorized_keys
B. restorecon .ssh/authorized_keys
C. ssh_keygen -t rsa -o .ssh/authorized_keys
D. chown root:root .ssh/authorized_keys

Answer: A

Explanation:
Explanation
The command that would resolve the issue is chmod 600 .ssh/authorized_keys. This command will change the permissions of the .ssh/authorized_keys file to 600, which means that only the owner of the file can read and write it. This is necessary for SSH key authentication to work properly, as SSH will refuse to use a key file that is accessible by other users or groups for security reasons. The output of ls -l shows that currently the
.ssh/authorized_keys file has permissions of 664, which means that both the owner and group can read and write it, and others can read it.
The other options are not correct commands for resolving the issue. The restorecon .ssh/authorized_keys command will restore the default SELinux security context for the .ssh/authorized_keys file, but this will not change its permissions or ownership. The ssh_keygen -t rsa -o .ssh/authorized_keys command is invalid because ssh_keygen is not a valid command (the correct command is ssh-keygen), and the -o option is used to specify a new output format for the key file, not the output file name. The chown root:root
.ssh/authorized_keys command will change the owner and group of the .ssh/authorized_keys file to root, but this will not change its permissions or make it accessible by the user who wants to log in with SSH key authentication. References: How to Use Public Key Authentication with SSH; chmod(1) - Linux manual page

NEW QUESTION # 631
A Linux administrator is creating a directory called CompTIA_doc and needs to switch to another location to perform some system-related tasks. Which of the following commands should the administrator use for this task?

A. mkdir CompTIA_doc > cd CompTIA_doc
B. mkdir CompTIA_doc || cd CompTIA_doc
C. mkdir CompTIA doc & cd CompTIA doc
D. mkdir CompTIA_doc && cd CompTIA_doc

Answer: D

Explanation:
Comprehensive and Detailed Step-by-Step
mkdir CompTIA_doc && cd CompTIA_doc ensures that the directory is created first, and only then does the command switch into it.
mkdir CompTIA doc is incorrect because it attempts to create two separate directories.
mkdir CompTIA_doc > cd CompTIA_doc uses incorrect syntax (> is used for output redirection).
mkdir CompTIA_doc || cd CompTIA_doc is incorrect because || means "execute the second command only if the first one fails."

NEW QUESTION # 632
A Linux administrator has set up a new DNS forwarder and is configuring all internal servers to use the new forwarder to look up external DNS requests. The administrator needs to modify the firewall on the server for the DNS forwarder to allow the internal servers to communicate to it and make the changes persistent between server reboots. Which of the following commands should be run on the DNS forwarder server to accomplish this task?

A. systemct1 reload firewalld
B. flrewall-cmd --zone-public --add-port-53/udp --permanent
C. iptables -A OUTPUT -p udp -ra udp -dport 53 -j ACCEPT
D. ufw allow out dns

Answer: B

Explanation:
The command that should be run on the DNS forwarder server to accomplish the task is firewall-cmd -- zone=public --add-port=53/udp --permanent. The firewall-cmd command is a tool for managing firewalld, which is a firewall service that provides dynamic and persistent network security on Linux systems. The firewalld uses zones and services to define the rules and policies for the network traffic. The zones are logical groups of network interfaces and sources that have the same level of trust and security. The services are predefined sets of ports and protocols that are associated with certain applications or functions. The -- zone=public option specifies the zone name that the rule applies to. The public zone is the default zone that represents the untrusted network, such as the internet. The --add-port=53/udp option adds a port and protocol to the zone. The 53 is the port number that is used by the DNS service. The udp is the protocol that is used by the DNS service. The --permanent option makes the change persistent across reboots. The command firewall- cmd --zone=public --add-port=53/udp --permanent will modify the firewall on the server for the DNS forwarder to allow the internal servers to communicate to it and make the changes persistent between server reboots. This is the correct command to use to accomplish the task. The other options are incorrect because they either do not modify the firewall on the server for the DNS forwarder (ufw allow out dns or systemct1 reload firewalld) or do not use the correct syntax for the command (iptables -A OUTPUT -p udp -ra udp - dport 53 -j ACCEPT instead of iptables -A OUTPUT -p udp -ra udp --dport 53 -j ACCEPT). References: CompTIA Linux+ (XK0-005) Certification Study Guide, Chapter 12: Managing Network Connections, page 392.

NEW QUESTION # 633
......

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