Authentic CompTIA Certification Exam XK0-006 Questions Answers

Process scheduling and resource management are essential Linux administration skills covered in Linux+ V8. When a process consumes excessive CPU resources, it can negatively impact overall system performance.

The correct solution is to lower the priority of the CPU-intensive task using the renice command. Niceness values influence how much CPU time a process receives relative to others. Increasing the niceness value reduces the process’s priority, allowing other applications to receive CPU resources more fairly.

Option B directly addresses the issue. The other options do not. pidstat monitors processes but does not modify CPU allocation. nohup allows a process to continue running after logout but does not affect scheduling priority. bg resumes a stopped job in the background but does not reduce CPU usage.

Linux+ V8 documentation explicitly references nice and renice for managing CPU contention. Therefore, the correct answer is B.

Maintaining system security requires regular patching and updates to mitigate vulnerabilities. In this scenario, the administrator is presented with the current system date (July 11, 2024) and a history of package management transactions via the dnf history command. The last recorded update transaction (ID 47) occurred on August 8, 2023. This indicates that the system has gone nearly a full year without receiving security patches or software updates.

According to CompTIA Linux+ V8 security best practices, " unpatched systems " represent one of the most significant risks to an organization ' s infrastructure. New vulnerabilities (CVEs) are discovered constantly, and vendors release patches to address these flaws. A system that has not been updated in a year is likely susceptible to numerous exploits that have been patched in more recent software versions. Therefore, the primary security concern is the lack of recent updates.

The other options are not valid security concerns in this context. While httpd (Apache) may have vulnerabilities if unpatched, its mere presence (Option B) is not inherently a security concern if the service is required for business operations. Option C refers to the time zone configuration (UTC vs. EDT), which has no impact on system security. Option D suggests disabling SELinux; however, SELinux in " Enforcing " mode is actually a security best practice that provides Mandatory Access Control (MAC) to protect the system. Disabling it would weaken the system ' s security posture rather than improve it.

The verified answer is that the server requires immediate patching due to the elapsed time since its last update.

The standard tool for managing the system hostname on modern Linux distributions using systemd is hostnamectl. According to the CompTIA Linux+ V8 objectives, the command hostnamectl set-hostname < name > is the correct and permanent way to change the server ' s identity.

When an administrator runs hostnamectl set-hostname comptia1, the utility updates the various types of hostnames recognized by the system:

Static Hostname: This is stored in /etc/hostname and persists across reboots.

Transient Hostname: A temporary name received via network configuration (like DHCP).

Pretty Hostname: A high-level, human-readable name that can include special characters.

Using hostnamectl is preferred over manually editing /etc/hostname because it immediately notifies the kernel and running services of the change, often without requiring a reboot to take effect system-wide.

The other options are incorrect. Option A, export HOSTNAME=comptia1, only changes the environment variable for the current shell session; it does not change the system ' s actual hostname and is lost when the session ends. Option B, adding the name to /etc/resolv.conf, is incorrect because that file is used for DNS resolver settings (nameservers and search domains), not for the local system ' s hostname. Option D, systemctl daemon-reload, is used to refresh systemd after configuration changes to unit files and has no functionality for changing a hostname.

Therefore, hostnamectl is the verified command for this task.