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| Section | Weight | Objectives |
|---|---|---|
| Security | 21% | - Manage firewalls - Manage file security and access controls - Configure SELinux and security contexts - Implement security hardening - Apply best practices for permissions and authentication - Perform vulnerability assessments |
| System Management | 32% | - Manage users and groups - Manage the Linux boot process - Manage permissions and ownership - Manage system components - Configure storage and cloud/virtualization technologies - Perform basic Linux tasks - Manage devices - Manage kernel modules - Configure kernel modules and network parameters - Manage storage - Manage packages and software - Manage networking - Manage files and directories |
| Troubleshooting | 28% | - Troubleshoot system properties and processes - Troubleshoot user issues - Troubleshoot application issues - Monitor system logs, health, and events - Troubleshoot network connectivity (firewall, routing, DNS) - Troubleshoot security issues (SELinux, permissions) - Troubleshoot hardware issues - Optimize performance (CPU, memory, I/O) |
| Scripting, Containers, and Automation | 19% | - Manage version control using Git - Deploy and manage containers (Docker/Podman) - Manage orchestration processes - Implement automation workflows - Write and execute BASH shell scripts - Automate administration with Python and configuration management tools |
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NEW QUESTION # 105
Which of the following does dmesgdisplay?
Answer: B
Explanation:
This command displays kernel ring buffer messages, which include hardware-related events such as device initialization and USB device connections.
NEW QUESTION # 106
A systems administrator is decommissioning a service. Which of the following commands should the administrator use to make sure users cannot start the service again?
Answer: B
Explanation:
The correct answer is A. systemctl mask service because masking a service ensures that it cannot be started manually or automatically under any circumstances. When a service is masked, its unit file is linked to /dev
/null, effectively making it impossible for systemd to start the service. This is the most appropriate action when permanently decommissioning a service and ensuring that no user or process can restart it.
Option D (systemctl disable service) is a common distractor but is incorrect in this context. Disabling a service only prevents it from starting automatically at boot time; however, users with sufficient permissions can still manually start the service using systemctl start. Therefore, it does not fully meet the requirement of preventing the service from being started again.
Option B (systemctl kill service) is incorrect because it only terminates the currently running instance of the service. It does not prevent the service from being restarted later, either manually or automatically.
Option C (systemctl isolate service) is also incorrect. The isolate command is used to switch the system to a different target (similar to changing runlevels), not to manage the long-term availability of a specific service.
In Linux system administration, particularly within the Linux+ objectives, understanding the difference between stop, disable, and mask is critical. While stopping halts a service temporarily and disabling prevents automatic startup, masking is the strongest control, ensuring the service cannot be activated at all. This makes it the correct and secure choice when decommissioning services in production environments.
NEW QUESTION # 107
Which of the following Ansible components contains a list of hosts and host groups?
Answer: A
Explanation:
In Ansible, the inventory defines the list of managed nodes (hosts) and groups of hosts. It is the source from which Ansible knows what systems to configure or manage.
NEW QUESTION # 108
A Linux system displays the following error during operation:
Kernel panic - not syncing: Fatal Machine check
Pid: 0, comm: swapper Tainted: G M
Call Trace:
...
mce_panic
do_machine_check
Which of the following is the most likely cause of this issue?
Answer: C
Explanation:
The correct answer is B. Hardware failure (CPU or memory) because the error message explicitly references a
"Machine Check Exception (MCE)", which is a hardware-level error detected by the CPU. The line "Kernel panic - not syncing: Fatal Machine check" indicates that the kernel encountered a critical, unrecoverable hardware condition and halted the system to prevent further damage or data corruption.
Machine Check Exceptions are generated by the CPU when it detects internal errors such as cache failures, bus errors, or memory corruption. These errors are typically associated with faulty hardware components like the processor, RAM, motherboard, or even overheating issues. The presence of functions like mce_panic and do_machine_check in the call trace further confirms that the kernel is responding to a hardware-level fault.
Option A (Filesystem corruption) is incorrect because filesystem issues usually generate I/O errors or mount failures, not machine check exceptions.
Option C (Misconfigured bootloader) is incorrect because bootloader problems typically prevent the system from starting properly, rather than causing runtime kernel panics with hardware-related traces.
Option D (Incorrect file permissions) is incorrect because permission issues affect user access and application behavior, not kernel-level operations.
From a Linux+ troubleshooting perspective, kernel panics related to machine checks require hardware diagnostics. Administrators should inspect system logs (/var/log/messages, dmesg), run memory tests (e.g., memtest86+), check CPU health, and verify system cooling. Hardware replacement or firmware updates may be necessary to resolve the issue.
NEW QUESTION # 109
A Linux administrator needs to create accounts for a list of new users. The user account names have been defined in the USER_LIST variable by executing the following:
USER_LIST= " alice bob charles "
Which of the following commands should the administrator use to successfully create the user accounts?
Answer: D
Explanation:
The correct answer is D. for username in $USER_LIST; do useradd -m " $username " ; done because it correctly iterates through each value in the USER_LIST variable and executes the useradd command for each user. In Bash scripting, a for loop is the most appropriate and commonly used construct for iterating over a list of space-separated values stored in a variable.
The variable USER_LIST= " alice bob charles " contains three usernames separated by spaces. When used in a for loop, Bash automatically splits the string into individual words, assigning each value to the variable username during each iteration. The useradd -m command then creates a new user account and also generates a home directory for each user, which is standard practice in Linux system administration.
Option A is incorrect because the syntax is invalid; a while loop requires a conditional expression or a read statement to process input, which is missing here. Option B is also incorrect because until loops require a condition and are not suitable for iterating over lists in this way. Option C is incorrect because the select statement is used for interactive menu-based selection, not for non-interactive batch processing, and quoting
$USER_LIST would treat the entire string as a single item.
From a Linux+ perspective, understanding shell scripting constructs such as loops is essential for automation and user management tasks. The for loop provides a simple and efficient way to perform repetitive administrative operations, such as creating multiple user accounts, ensuring consistency and saving time in system provisioning.
NEW QUESTION # 110
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