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| Section | Weight | Objectives |
|---|---|---|
| System Management | 32% | - Manage storage - Manage system components - Manage networking - Manage devices - Manage packages and software - Manage files and directories - Manage users and groups - Configure kernel modules and network parameters - Perform basic Linux tasks - Manage kernel modules - Manage the Linux boot process - Configure storage and cloud/virtualization technologies - Manage permissions and ownership |
| Scripting, Containers, and Automation | 19% | - Write and execute BASH shell scripts - Manage version control using Git - Automate administration with Python and configuration management tools - Deploy and manage containers (Docker/Podman) - Implement automation workflows - Manage orchestration processes |
| Security | 21% | - Implement security hardening - Manage file security and access controls - Apply best practices for permissions and authentication - Manage firewalls - Perform vulnerability assessments - Configure SELinux and security contexts |
| Troubleshooting | 28% | - Troubleshoot network connectivity (firewall, routing, DNS) - Troubleshoot application issues - Troubleshoot security issues (SELinux, permissions) - Monitor system logs, health, and events - Troubleshoot user issues - Optimize performance (CPU, memory, I/O) - Troubleshoot system properties and processes - Troubleshoot hardware issues |
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NEW QUESTION # 171
A Linux administrator needs to create and then connect to the app-01-imagecontainer. Which of the following commands accomplishes this task?
Answer: C
Explanation:
The docker run -it command both creates a new container from the specified image and attaches to it interactively, which is exactly what the administrator needs.
NEW QUESTION # 172
Which of the following best describes journald?
Answer: A
Explanation:
journald is part of systemd and is responsible for collecting, storing, and managing log data from various sources such as the kernel, services, and applications.
NEW QUESTION # 173
Users report that after about a week, an application hosted in a system stops responding, requiring the system to be restarted to recover. A systems administrator connects to the system and obtains the following output:
Which of the following describes the reason the application stops responding?
Answer: D
Explanation:
The output shows memory and swap are fully consumed, and the kernel invoked the OOM killer against the application due to excessive resident memory usage, which is consistent with a memory leak gradually exhausting available RAM and swap until the application becomes unresponsive.
NEW QUESTION # 174
Which of the following does dmesg display?
Answer: A
Explanation:
The dmesg (diagnostic message) utility is a critical tool for system management and hardware troubleshooting in Linux+ V8. It is used to display the kernel ring buffer, which contains messages generated by the Linux kernel during the boot process and while the system is running.
The kernel ring buffer primarily records events related to hardware initialization, device driver status, and system resources. When a hardware device is connected to the system-such as a USB drive, a network card, or a keyboard-the kernel detects the event and logs the details. For example, when a USB device is plugged in, dmesg will show the manufacturer, the device ID, and the mount point or device node (e.g., /dev/sdb1) assigned to it.
The other options refer to logs that are typically handled by different services:
* Incorrect login attempts (Option A) and " Session closed " messages (Option B) are authentication and security events. These are usually logged by sshd or pam and stored in /var/log/auth.log or /var/log
/secure.
* Window manager warnings (Option C) are related to the graphical user interface (X11 or Wayland) and are stored in desktop-specific log files or the systemd journal.
According to CompTIA Linux+ documentation, dmesg is the primary tool for verifying hardware detection and diagnosing driver issues. Because it focuses on the kernel-hardware interface, " USB device connections " is the correct answer among the choices provided.
NEW QUESTION # 175
A Linux administrator needs to change the server name to comptia1. Which of the following commands should the administrator use?
Answer: C
Explanation:
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.
NEW QUESTION # 176
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