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CompTIA XK0-006 Exam Syllabus Topics:

Topic	Details
Topic 1	Services and User Management: Covers day-to-day Linux administration including file management, user accounts, processes, software, services, and container operations.
Topic 2	Security: Focuses on securing Linux systems through authentication, firewalls, OS hardening, account policies, cryptography, and compliance checks.
Topic 3	Automation, Orchestration, and Scripting: Covers task automation with tools like Ansible, shell and Python scripting, Git version control, and responsible AI-assisted development.
Topic 4	Troubleshooting: Addresses diagnosing and resolving issues across system health, hardware, storage, networking, security configurations, and performance optimization.

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CompTIA Linux+ Certification Exam Sample Questions (Q190-Q195):

NEW QUESTION # 190
An average of one out of three users in a company cannot reach the company website. A Linux administrator determines that one of the three website servers is down. The administrator inspects the DNS configuration for the website and notices the following entry:

Which of the following accurately explains the issue?

A. DNS returns all three records in a different order each time, and the browser typically uses the first address in the DNS response.
B. The administrator has incorrectly configured the DNS server to be an iterative resolver instead of an authoritative resolver.
C. One of the DNS records has not been signed with a DNSSEC-supported key, and this is causing some web browsers to reject the DNS response.
D. The DNS configuration is missing corresponding AAAA records and PTR records, and this is causing clients to fail the hostname translation.

Answer: A

Explanation:
With multiple A records, DNS performs simple round-robin ordering and returns the records in a different sequence on each query. Most clients try the first address returned-so when the downed server's IP appears first (about one in three times), those users cannot connect.

NEW QUESTION # 191
Which of the following best describes the role of initrd?

A. It contains trusted certificates and secret keys of the system.
B. It is required to connect to the system via SSH.
C. It contains basic kernel modules and drivers required to start the system.
D. It is required to initialize a random device within a Linux system.

Answer: C

Explanation:
initrd (initial ramdisk) provides essential kernel modules and drivers (e.g., for storage and filesystems) needed during the early boot process before the root filesystem is mounted.

NEW QUESTION # 192
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?

A. The application has a memory leak, which consumes all the available memory on the system.
B. The application has an incorrect disk quota, which fills up the filesystem.
C. The application is not allowed to allocate memory, which slows down the system.
D. The application is configured incorrectly, which depletes memory and swap.

Answer: A

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 # 193
While hardening a system, an administrator runs a port scan with Nmap, which returned the following output:

Which of the following is the best way to address this security issue?

A. Configuring a firewall to block traffic on port 23 on the server
B. Disabling and removing the Telnet service on the server
C. Changing the system administrator's password to prevent unauthorized access
D. Closing port 80 on the network switch to block traffic

Answer: B

Explanation:
This scenario falls under the Security domain of the CompTIA Linux+ V8 objectives and focuses on system hardening and service minimization. The Nmap scan output reveals that port 23 (Telnet) is open on the system, which represents a significant security risk.
Telnet is an insecure, legacy protocol that transmits authentication credentials and session data in plaintext, making it vulnerable to interception through packet sniffing or man-in-the-middle attacks. Linux+ V8 documentation explicitly emphasizes the principle of least functionality, which states that unnecessary or insecure services should be disabled and removed entirely rather than merely restricted.
Option D, disabling and removing the Telnet service on the server, is the best and most secure solution. This action eliminates the vulnerable service completely, ensuring that it cannot be exploited internally or externally. In secure Linux environments, Telnet should be replaced with SSH, which provides encrypted communication and strong authentication mechanisms.
Option A, blocking port 23 with a firewall, reduces exposure but does not eliminate the underlying risk. If the firewall rules are misconfigured or bypassed, the Telnet service would still be available. Linux+ V8 best practices recommend removing insecure services rather than relying solely on perimeter controls.
Option B is unrelated, as changing passwords does not address the risk of plaintext credential transmission.
Option C is incorrect because closing ports at the network switch level is not an appropriate or scalable solution for host-level service hardening and does not address internal access risks.
Linux+ V8 documentation consistently highlights service auditing, port scanning, and removal of insecure protocols as essential system hardening steps. Therefore, the most effective and secure remediation is to disable and remove the Telnet service.

NEW QUESTION # 194
A systems administrator is developing a script to copy a file if it exists and return an error if it does not. Given the following incomplete script:

Which of the following statements is missing from the script?

A. while
A\B.
done
B. for
C. else

Answer: C

Explanation:
An else statement is required to handle the condition when the file does not exist so the script can return the error message instead of attempting the copy operation.

NEW QUESTION # 195
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