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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: System Management | 32% | - Manage networking - Manage files and directories - Manage the Linux boot process - Manage devices - Manage users and groups - Manage permissions and ownership - Perform basic Linux tasks - Manage packages and software - Configure kernel modules and network parameters - Configure storage and cloud/virtualization technologies - Manage system components - Manage storage - Manage kernel modules |
| Topic 2: Troubleshooting | 28% | - Troubleshoot security issues (SELinux, permissions) - Troubleshoot hardware issues - Monitor system logs, health, and events - Troubleshoot network connectivity (firewall, routing, DNS) - Troubleshoot user issues - Troubleshoot application issues - Troubleshoot system properties and processes - Optimize performance (CPU, memory, I/O) |
| Topic 3: Security | 21% | - Manage file security and access controls - Apply best practices for permissions and authentication - Configure SELinux and security contexts - Manage firewalls - Perform vulnerability assessments - Implement security hardening |
| Topic 4: Scripting, Containers, and Automation | 19% | - Deploy and manage containers (Docker/Podman) - Implement automation workflows - Write and execute BASH shell scripts - Automate administration with Python and configuration management tools - Manage orchestration processes - Manage version control using Git |
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NEW QUESTION # 161
Which of the following can reduce the attack surface area in relation to Linux hardening?
Answer: B
Explanation:
Comprehensive and Detailed Explanation From Exact Extract:
Reducing the attack surface area in Linux hardening refers to limiting possible points of unauthorized access.
According to the CompTIA Linux+ Official Study Guide (Exam XK0-006), enforcing strong password policies is a critical aspect of security hardening. This practice ensures that user accounts are protected by passwords that are difficult to guess or crack, thus minimizing the risk of successful brute-force attacks.
Implementing password complexity requirements (such as minimum length, use of uppercase, lowercase, numbers, and special characters) directly addresses one of the primary vectors for unauthorized access.
Other options do not have a direct impact on reducing the attack surface:
* A. Customizing the log-in banner serves as a legal notification and does not affect system vulnerabilities.
* B. Reducing the number of directories created is not related to hardening or access control.
* C. Extending the SSH startup timeout period may give attackers more time to attempt a connection and does not increase security.
Reference:
CompTIA Linux+ Study Guide: Exam XK0-006, Sybex, Chapter 11: "Securing the System", Section:
"Implementing Password Policies"
CompTIA Linux+ XK0-006 Exam Objectives, Domain 3.0: Security
NEW QUESTION # 162
An administrator is investigating the reason a Linux workstation is not resolving the website
http://www.comptia.org. The administrator executes some commands and receives the following output:
Which of the following is the most likely cause?
Answer: C
Explanation:
When troubleshooting name resolution issues in Linux, /etc/hosts entries take precedence over DNS lookups. The workstation's /etc/hosts file contains the line:
CopyEdit
104.18.99.101 www.comptia.org
This means any attempt to access www.comptia.org will resolve to 104.18.99.101, regardless of the real DNS response. However, both dig and nslookup show the correct IP as 104.18.16.29.
Because the local /etc/hosts entry overrides DNS, and the hardcoded IP is either incorrect or unreachable, all network traffic to www.comptia.org will fail or not reach the intended destination, resulting in the observed connectivity issue (Destination Host Unreachable).
NEW QUESTION # 163
Which of the following commands can be used to display real-time running processes on a Linux system?
Answer: B
Explanation:
The correct answer is B. top because it provides a dynamic, real-time view of running processes and system resource usage. The top command is an essential Linux system monitoring utility that continuously updates information about CPU usage, memory consumption, running processes, load averages, and system uptime. It is widely used by system administrators for performance monitoring and troubleshooting.
When executed, top displays a full-screen interface showing active processes sorted by resource usage (typically CPU by default). It updates at regular intervals, allowing administrators to observe changes in real time. Additionally, it offers interactive features such as sorting processes, killing processes, and filtering output, which enhances system management capabilities.
NEW QUESTION # 164
A Linux systems administrator is running an important maintenance task that consumes a large amount of CPU, causing other applications to slow. Which of the following actions should the administrator take to help alleviate the issue?
Answer: B
Explanation:
The renice command adjusts the priority of a running process. By lowering the maintenance task's priority, the scheduler allocates more CPU time to other applications, reducing their slowdown.
NEW QUESTION # 165
Which of the following commands should an administrator run to check for errors during startup?
Answer: D
Explanation:
The correct answer is B. dmesg because it displays the kernel ring buffer, which contains messages generated during system boot and runtime. These messages include hardware initialization details, driver loading status, and error or warning messages that occur during startup. This makes dmesg one of the most important tools for troubleshooting boot-related issues in Linux.
When a Linux system boots, the kernel initializes hardware components and loads drivers. Any issues encountered during this process-such as missing drivers, hardware failures, or misconfigurations-are logged in the kernel ring buffer. By running dmesg, administrators can review these messages and identify the root cause of startup problems. It is common to combine dmesg with tools like grep (e.g., dmesg | grep -i error) to filter relevant error messages.
Option A (modinfo) is incorrect because it provides information about kernel modules, such as version and dependencies, but does not display boot errors.
Option C (dracut) is incorrect because it is used to create or regenerate initramfs images, not to check system logs or startup errors.
Option D (lshw) is incorrect because it lists detailed hardware information but does not show boot-time errors or logs.
From a Linux+ troubleshooting perspective, analyzing boot logs is critical for diagnosing system issues. The dmesg command provides immediate access to kernel-level messages, making it an essential tool for identifying hardware and driver-related problems that occur during system startup.
NEW QUESTION # 166
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