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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Troubleshooting | 28% | - Troubleshoot hardware issues - Troubleshoot system properties and processes - Troubleshoot network connectivity (firewall, routing, DNS) - Monitor system logs, health, and events - Troubleshoot security issues (SELinux, permissions) - Optimize performance (CPU, memory, I/O) - Troubleshoot user issues - Troubleshoot application issues |
| Topic 2: System Management | 32% | - Manage permissions and ownership - Manage files and directories - Configure storage and cloud/virtualization technologies - Perform basic Linux tasks - Manage devices - Manage system components - Manage packages and software - Manage storage - Manage kernel modules - Manage users and groups - Manage the Linux boot process - Manage networking - Configure kernel modules and network parameters |
| Topic 3: Scripting, Containers, and Automation | 19% | - Write and execute BASH shell scripts - Manage orchestration processes - Deploy and manage containers (Docker/Podman) - Automate administration with Python and configuration management tools - Manage version control using Git - Implement automation workflows |
| Topic 4: Security | 21% | - Perform vulnerability assessments - Configure SELinux and security contexts - Manage firewalls - Implement security hardening - Manage file security and access controls - Apply best practices for permissions and authentication |
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NEW QUESTION # 40
An administrator completes maintenance on a server but cannot remount the logical volume.
Given the following output:
Which of the following commands should the administrator execute to resolve the issue?
Answer: D
Explanation:
The error message "special device /dev/data/files does not exist" suggests that the volume group data is not activated. From the lvsand vgsoutput:
- The logical volume files exists within the data volume group.
- The volume group (VG) and logical volume (LV) appear correctly listed, but they might be in an inactive state due to maintenance.
NEW QUESTION # 41
A Linux user needs to download the latest Debian image from a Docker repository. Which of the following commands makes this task possible?
Answer: A
Explanation:
The correct answer is B. docker image pull debian because it is the standard Docker command used to download container images from a remote repository such as Docker Hub. In Docker terminology, "pulling" an image means retrieving it from a remote registry and storing it locally so it can be used to create containers.
When a user executes docker image pull debian, Docker connects to the default registry (Docker Hub), searches for the official Debian image, and downloads the latest version (by default, the "latest" tag unless otherwise specified). This command is essential in container-based workflows and is commonly used in automation, orchestration, and DevOps environments.
Option A (docker image init debian) is incorrect because there is no valid Docker command called init under docker image. Initialization of containers is handled differently, typically via docker run.
Option C (docker image import debian) is incorrect because import is used to create a Docker image from a local tarball or file, not to download from a remote repository.
Option D (docker image save debian) is incorrect because save is used to export an existing local image into a tar archive for backup or transfer purposes. It does not download images.
From a Linux+ perspective, understanding container management is a key part of automation and orchestration. Commands like docker pull allow administrators to quickly provision environments, deploy applications, and maintain consistency across systems. This makes it a fundamental skill for modern Linux system administration and DevOps practices
NEW QUESTION # 42
Which of the following commands would a Linux administrator use to determine the temperature of a motherboard?
Answer: A
Explanation:
This utility reads hardware sensor data exposed by the system, including motherboard and CPU temperature values, allowing administrators to monitor system thermal conditions.
NEW QUESTION # 43
A Linux systems administrator is creating a new file, /var/tmp/myfile. This file needs to point to /usr/local/myfile. Both files reside on different filesystems. Which of the following commands should the administrator use to accomplish this task?
Answer: B
Explanation:
A symbolic link can reference a target located on a different filesystem, making it the correct method for creating a pointer from /var/tmp/myfile to /usr/local/myfile when the files reside on separate filesystems.
NEW QUESTION # 44
A Linux administrator just finished setting up passwordless SSH authentication between two nodes. However, upon test validation, the remote host prompts for a password. Given the following logs:
Which of the following is the most likely cause of the issue?
Answer: B
Explanation:
This issue is directly related to SELinux enforcement, which is a key topic in the Security domain of CompTIA Linux+ V8. The logs clearly indicate that SSH key-based authentication is failing due to an SELinux access control violation rather than a traditional file permission or SSH configuration problem.
The most important clue is the AVC denial message, which shows that the sshd process is being denied read access to the authorized_keys file. The security context of the file is listed as unconfined_u:object_r:
home_root_t:s0. Under a targeted SELinux policy, SSH is only permitted to read authorized_keys files that are labeled with the correct SELinux type, typically ssh_home_t.
Because SELinux is running in enforcing mode, it actively blocks access that violates policy rules, even if standard UNIX permissions are correct. Although the file permissions (600) are acceptable for an authorized_keys file, SELinux does not rely solely on traditional permissions. The mismatch between the expected SELinux context and the actual context prevents sshd from accessing the file, causing SSH to fall back to password authentication.
Option D correctly identifies the root cause: the authorized_keys file does not have the correct SELinux security context. This is a well-documented Linux+ V8 troubleshooting scenario, commonly resolved by restoring the correct context using commands such as restorecon or by ensuring the file resides in a properly labeled home directory.
The other options are incorrect. Restarting sshd does not fix SELinux labeling issues. The policy itself is functioning as intended, and file ownership alone does not override SELinux access controls.
Linux+ V8 documentation emphasizes that SELinux denials must be addressed by correcting file contexts rather than weakening security controls. Therefore, the correct answer is D.
NEW QUESTION # 45
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