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Pass Guaranteed 2025 CompTIA XK0-005: CompTIA Linux+ Certification Exam First-grade Exam Study Guide

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CompTIA Linux+ certification exam is intended for individuals who are interested in pursuing a career in Linux system administration. It is also suitable for professionals who want to enhance their knowledge and skills in Linux system administration. XK0-005 Exam covers various topics, including Linux command line, Linux file system, user management, network configuration, shell scripting, and more. It also includes performance-based questions, which test the candidate's ability to perform real-world tasks on a Linux system.

To prepare for the CompTIA Linux+ certification exam, candidates can take advantage of various study resources such as study guides, practice exams, and online courses. These resources are designed to help candidates understand the exam objectives and prepare for the actual exam. Additionally, candidates can take advantage of hands-on experience with Linux systems through virtual labs or by setting up their own Linux environment.

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The CompTIA Linux+ Certification Exam certification exam is suitable for entry-level and experienced Linux system administrators, network administrators, and security professionals who want to validate their knowledge and skills in Linux administration. It is also ideal for individuals who are seeking to transition into the IT industry and want to pursue a career in Linux system administration.

CompTIA Linux+ Certification Exam Sample Questions (Q139-Q144):

NEW QUESTION # 139
An administrator is running a web server in a container named WEB, but none of the error output is showing.
Which of the following should the administrator use to generate the errors on the container?

A. docker ps WEB -f
B. docker run --name WEB --volume /dev/stdout:/var/log/nginx/error.log
C. docker logs WEB
D. docker-compose inspect WEB

Answer: C

Explanation:
The docker logs command retrieves logs, including errors, for a running container. By using docker logs WEB, the administrator can check the error output generated by the web server container and debug any issues related to application performance or errors.

NEW QUESTION # 140
An administrator received a request from a security officer to eliminate a blacklisting set called internal-blockedthe company is using in the iptables firewall.
Which of the following commands will complete the task?

A. ipset swap internal-blocked none
B. ipset remove internal-blocked
C. ipset del internal-blocked
D. ipset destroy internal-blocked

Answer: D

NEW QUESTION # 141
A systems administrator wants to check the log of changes made to a Git repository.
Which of the following commands can be used for this task?

A. git reflog
B. git commit log
C. git push log
D. git branch list

Answer: A

NEW QUESTION # 142
An administrator added the port 2222 for the SSH server on myhost and restarted the SSH server. The administrator noticed issues during the startup of the service. Given the following outputs:

Which of the following commands will fix the issue?

A. chcon system_u:object_r:ssh_home_t /etc/ssh/*
B. semanage port -a -t ssh_port_t -p tcp 2222
C. iptables -A INPUT -p tcp -- dport 2222 -j ACCEPT
D. firewall-cmd -- zone=public -- add-port=2222/tcp

Answer: B

Explanation:
Explanation
The correct answer is A. semanage port -a -t ssh_port_t -p tcp 2222
This command will allow the SSH server to bind to port 2222 by adding it to the SELinux policy. The semanage command is a utility for managing SELinux policies. The port subcommand is used to manage network port definitions. The -a option is used to add a new record, the -t option is used to specify the SELinux type, the -p option is used to specify the protocol, and the tcp 2222 argument is used to specify the port number. The ssh_port_t type is the default type for SSH ports in SELinux.
The other options are incorrect because:
B: chcon system_u:object_r:ssh_home_t /etc/ssh/*
This command will change the SELinux context of all files under /etc/ssh/ to system_u:object_r:ssh_home_t, which is not correct. The ssh_home_t type is used for user home directories that are accessed by SSH, not for SSH configuration files. The correct type for SSH configuration files is sshd_config_t.
C: iptables -A INPUT -p tcp --dport 2222 -j ACCEPT
This command will add a rule to the iptables firewall to accept incoming TCP connections on port 2222.
However, this is not enough to fix the issue, as SELinux will still block the SSH server from binding to that port. Moreover, iptables may not be the default firewall service on some Linux distributions, such as Fedora or CentOS, which use firewalld instead.
D: firewall-cmd --zone=public --add-port=2222/tcp
This command will add a rule to the firewalld firewall to allow incoming TCP connections on port 2222 in the public zone. However, this is not enough to fix the issue, as SELinux will still block the SSH server from binding to that port. Moreover, firewalld may not be installed or enabled on some Linux distributions, such as Ubuntu or Debian, which use iptables instead.
References:
How to configure SSH to use a non-standard port with SELinux set to enforcing Change SSH Port on CentOS/RHEL/Fedora With SELinux Enforcing How to change SSH port when SELinux policy is enabled

NEW QUESTION # 143
A systems administrator needs to reconfigure a Linux server to allow persistent IPv4 packet forwarding. Which of the following commands is the correct way to accomplish this task?

A. echo 1 > /proc/sys/net/ipv4/ipv_forward
B. firewall-cmd --enable ipv4_forwarding
C. sysctl -w net.ipv4.ip_forward=1
D. systemctl start ipv4_forwarding

Answer: C

Explanation:
The command sysctl -w net.ipv4.ip_forward=1 enables IPv4 packet forwarding temporarily by setting the kernel parameter net.ipv4.ip_forward to 1. To make this change persistent, the administrator needs to edit the file /etc/sysctl.conf and add the line net.ipv4.ip_forward = 1. The other options are incorrect because they either use the wrong file (/proc/sys/net/ipv4/ipv_forward), the wrong command (firewall-cmd or systemctl), or the wrong option (--enable or start). Reference: CompTIA Linux+ (XK0-005) Certification Study Guide, Chapter 12: Managing Network Connections, page 378.

NEW QUESTION # 144
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