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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Troubleshooting | 28% | - Troubleshoot user issues - Troubleshoot system properties and processes - Troubleshoot security issues (SELinux, permissions) - Troubleshoot network connectivity (firewall, routing, DNS) - Monitor system logs, health, and events - Optimize performance (CPU, memory, I/O) - Troubleshoot application issues - Troubleshoot hardware issues |
| Topic 2: System Management | 32% | - Manage system components - Manage the Linux boot process - Manage storage - Configure storage and cloud/virtualization technologies - Manage networking - Manage users and groups - Manage files and directories - Configure kernel modules and network parameters - Manage permissions and ownership - Manage packages and software - Manage kernel modules - Perform basic Linux tasks - Manage devices |
| Topic 3: Scripting, Containers, and Automation | 19% | - Manage orchestration processes - Deploy and manage containers (Docker/Podman) - Write and execute BASH shell scripts - Manage version control using Git - Automate administration with Python and configuration management tools - Implement automation workflows |
| Topic 4: Security | 21% | - Configure SELinux and security contexts - Perform vulnerability assessments - Manage file security and access controls - Manage firewalls - Apply best practices for permissions and authentication - Implement security hardening |
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NEW QUESTION # 19
A Linux software developer wants to use AI to optimize source code used in a commercial product. Which of the following steps should the developer take first?
Answer: B
Explanation:
Linux+ V8 emphasizes security, compliance, and governance when introducing new automation technologies, including AI. Before using AI tools to optimize commercial source code, the developer must ensure that such usage complies with organizational policies.
Option B is correct because verifying company policy is the first and most critical step. AI tools may introduce risks such as intellectual property leakage, licensing conflicts, or regulatory violations. Many organizations restrict how source code can be shared with external systems, including AI services.
The other options are premature. Selecting tools or deploying models should only occur after policy approval.
Linux+ V8 highlights governance-first approaches when adopting automation technologies.
Therefore, the correct answer is B.
NEW QUESTION # 20
A Linux user frequently tests shell scripts located in the /home/user/scripts directory. Which of the following commands allows the user to run the program by invoking only the script name?
Answer: A
Explanation:
In Linux, the ability to execute a program by typing only its name depends on whether the directory containing the executable is included in the user's PATH environment variable. The PATH variable defines a colon-separated list of directories that the shell searches when a command is entered.
Option C, export PATH=$PATH:/home/user/scripts, correctly appends the /home/user/scripts directory to the existing PATH variable. Once this command is executed, any executable script located in that directory can be run simply by typing its filename, provided the script has execute permissions. This behavior is explicitly covered in the Linux+ V8 objectives related to environment variables and shell configuration.
The other options are incorrect. Option A incorrectly attempts to redefine the SHELL variable and uses invalid syntax. Option B modifies the TERM variable, which controls terminal type and has nothing to do with command execution. Option D attempts to create an alias using invalid syntax and would not affect command lookup behavior.
Linux+ V8 documentation emphasizes modifying the PATH variable as the standard and recommended method for simplifying script execution. This approach is commonly used by developers and administrators who frequently run custom scripts.
Therefore, the correct answer is C.
NEW QUESTION # 21
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: D
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 # 22
Which of the following is the main reason for setting up password expiry policies?
Answer: D
Explanation:
Password management is a core topic in the Security domain of CompTIA Linux+ V8. Password expiry policies are implemented to reduce the risk associated with long-lived credentials.
The primary reason for enforcing password expiration is to mitigate the risk of exposed or compromised passwords. If a password is leaked through phishing, malware, keylogging, or data breaches, limiting its lifespan reduces the window of opportunity for attackers to exploit it. Requiring periodic password changes ensures that compromised credentials eventually become invalid.
Option B correctly captures this security objective. Linux+ V8 documentation emphasizes minimizing credential exposure as a key principle of access control.
The other options are secondary or incorrect. Avoiding password reuse and increasing complexity are addressed through password history and complexity policies, not expiration alone. Password expiry does not force passwordless authentication, making option C incorrect.
Therefore, the correct answer is B. To mitigate the use of exposed passwords.
NEW QUESTION # 23
Which of the following is the location for built-in Linux executable files and utilities?
Answer: C
Explanation:
The correct answer is A. /bin because it contains essential user command binaries (executables) that are required for basic system functionality and are available to all users. These include fundamental commands such as ls, cp, mv, cat, and bash, which are necessary for system operation even in single-user mode or during system recovery.
The /bin directory is part of the Filesystem Hierarchy Standard (FHS) and is intended to store critical executable programs that must be accessible at all times, including when other filesystems (such as /usr) may not be mounted. This ensures that core system utilities are always available for administrative and maintenance tasks.
Option B (/var) is incorrect because it stores variable data such as logs, mail, spool files, and temporary files that change frequently. It does not contain executable binaries.
Option C (/etc) is incorrect because it contains system configuration files rather than executable programs.
Files in /etc define how services and system components behave.
Option D (/sys) is incorrect because it is a virtual filesystem that provides an interface to kernel data structures. It is used for interacting with hardware and kernel subsystems, not for storing executable utilities.
From a Linux+ system management perspective, understanding filesystem structure is essential. The /bin directory plays a crucial role in ensuring that essential commands are always accessible, making it a key component of system reliability and administration.
NEW QUESTION # 24
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