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CompTIA XK0-006 Exam Syllabus Topics:

Section	Weight	Objectives
Security	25%	- System security and access control 1. Authentication and authorization mechanisms 2. Firewall configuration (firewalld, iptables) 3. User and group management 4. File permissions and ownership
Scripting, Containers & Automation	20%	- Automation and scripting 1. Shell scripting fundamentals (bash) 2. Configuration management concepts 3. Task automation using cron and system tools 4. Container basics (Docker concepts)
Troubleshooting	25%	- System and network troubleshooting 1. Log file analysis and system diagnostics 2. Performance and resource monitoring 3. Diagnosing boot and service failures 4. Network connectivity troubleshooting
System Management	30%	- Linux installation, configuration, and system management 1. Package management (RPM, DPKG, YUM, APT) 2. System initialization and service management (systemd) 3. Storage configuration (partitions, LVM, filesystems) 4. Kernel modules and system boot process

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CompTIA Linux+ Certification Exam Sample Questions (Q74-Q79):

NEW QUESTION # 74
A systems administrator is deploying a new secure web server but is having issues starting it.
The administrator reviews the following outputs:

Which of the following commands fixes this issue while following security best practices?

A. setenforce 0
B. semarage -a -t http_port_t -p tcp 1234
C. setsebool -P http_port_t 1234
D. systemctl unmask httpd

Answer: B

Explanation:
The web server is running with SELinux in enforcing mode, and Apache is denied permission to bind to TCP port 1234 because that port is not labeled for HTTP services. Adding port 1234 to the
http_port_t SELinux type allows Apache to bind to the port while keeping SELinux enforcing, which follows security best practices.

NEW QUESTION # 75
Users are unable to access a server after it is restarted. However, an administrator is able to connect directly to the server through a console in the server room and sees the following:

Which of the following is the most likely reason for this connectivity issue?

A. The server networking cable is plugged into the wrong interface and needs to be moved
B. The server's network card has failed and will need to be replaced with a new networking card
C. The server is not able to obtain an IP address from the DHCP server
D. The server has no issue with the network and should be restarted to restore functionality

Answer: C

Explanation:
The interface has a 169.254.x.x address, which is a link-local address typically assigned when DHCP fails. This indicates the server is not receiving a valid IP address from the DHCP server after the restart.

NEW QUESTION # 76
A systems administrator is configuring new Linux systems and needs to enable passwordless authentication between two of the servers. Which of the following commands should the administrator use?

A. ssh-add -t rsa && scp -rp ~/.ssh john@server2
B. ssh-agent -i rsa && ssh-copy-id ~/.ssh/key john@server2
C. ssh-keygen -t rsa && ssh-copy-id -i ~/.ssh/id_rsa.pub john@server2
D. ssh-keyscan -t rsa && ssh-copy-id john@server2 -i ~/.ssh/key

Answer: C

Explanation:
This command generates an SSH key pair and securely copies the public key to the remote server, enabling passwordless authentication by allowing key-based SSH login between the systems.

NEW QUESTION # 77
Which of the following most accurately describes a webhook?

A. An HTTP-based callback function
B. An authentication method for web-server communication
C. A means to transmit sensitive information between systems
D. An SNMP-based API for network device monitoring

Answer: A

Explanation:
A webhook is an HTTP-based callback that allows one system to send real-time data or notifications to another system when an event occurs.

NEW QUESTION # 78
A small group of remote users needs permission to run some administrative commands on a Linux server.
Which of the following approaches is the best way to address this request?

A. Set the configuration parameter PermitRootLogin on sshd_config to " yes " and share the root password with this group of users.
B. Request a list of utilities they need to use with elevated privileges, and add the appropriate rules.
C. Create a Linux group, add the users, and configure this group on /etc/sudoers to use sudo, thus allowing them to switch to root user.
D. Set the sticky bit in all binaries requested for use by this group of users.

Answer: C

Explanation:
The correct answer is D. Create a Linux group, add the users, and configure this group on /etc/sudoers to use sudo because it follows the principle of least privilege while providing controlled administrative access. In Linux systems, sudo is the recommended mechanism for delegating elevated privileges without granting full root access.
By creating a dedicated group and adding users to it, administrators can centrally manage permissions.
Configuring this group in the /etc/sudoers file (preferably using visudo) allows fine-grained control over which commands can be executed with elevated privileges. This approach ensures accountability, as sudo logs all executed commands, and enhances security by avoiding password sharing.
Option A is incorrect because the sticky bit does not grant administrative privileges; it is used primarily on directories to restrict file deletion.
Option B is partially correct in principle (least privilege), but it is incomplete because it does not specify implementation. Without integrating those rules into sudoers or another privilege delegation mechanism, it does not provide a complete solution.
Option C is incorrect and highly insecure. Enabling root login over SSH and sharing the root password violates security best practices, eliminates accountability, and significantly increases the risk of compromise.
From a Linux+ security perspective, using sudo with group-based access control is the best practice for privilege delegation. It ensures secure, auditable, and manageable administrative access, aligning with enterprise security standards and minimizing risk exposure.

NEW QUESTION # 79
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