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CompTIA XK0-006 Exam Overview:

Certification Vendor:	CompTIA
Exam Name:	CompTIA Linux+ Certification Exam
Exam Number:	XK0-006
Available Languages:	English
Real Exam Qty:	Maximum of 90
Passing Score:	720 (on a scale of 100–900)
Certificate Validity Period:	3 years
Exam Price:	USD 348
Exam Duration:	90 minutes
Related Certifications:	CompTIA Linux+
Exam Format:	Multiple-choice, Performance-based
Sample Questions:	CompTIA XK0-006 Sample Questions
Exam Way:	Online (via Pearson VUE) or In-person at Pearson VUE testing centers
Pre Condition:	No formal prerequisites; recommended 12 months of hands-on experience with Linux administration
Official Syllabus URL:	https://www.comptia.org/en-us/certifications/linux

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CompTIA XK0-006 Exam Syllabus Topics:

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

CompTIA Linux+ Certification Exam Sample Questions (Q21-Q26):

NEW QUESTION # 21
A Linux server is experiencing slowness. A systems administrator obtains the following output:
top - load average: 2.43, 1.80, 2.32
Tasks: ... 154 zombie
%Cpu(s): 6.2 us, 5.1 sy, 0.0 ni, 79.2 id, 9.1 wa, ...
$ iostat -m 2
%user %nice %system %iowait %steal %idle
4.30 2.02 0.29 70.38 4.00 19.01
Which of the following explains the issue?

A. The storage I/O latency is high.
B. The CPU is overutilized.
C. The system ran out of swap space.
D. The system needs to be patched.

Answer: A

Explanation:
Performance troubleshooting in CompTIA Linux+ V8 requires the ability to correlate metrics from tools like top, vmstat, and iostat. In this case, the iostat output provides the most critical data point: %iowait is at
70.38%.
The %iowait metric (also shown as wa in top) represents the percentage of time that the CPU was idle while there were outstanding disk I/O requests. Essentially, the CPU is waiting for the storage subsystem (hard drives or SSDs) to complete read or write operations. A value as high as 70% indicates a severe bottleneck in the storage layer. This " I/O wait " causes the system to feel sluggish or unresponsive because processes are stuck in an uninterruptible sleep state while waiting for data from the disk.
The top output also shows that the overall CPU is 79.2% idle, which confirms that the problem is NOT a lack of computational power (overutilization), making Option B incorrect. The system has 154 zombie processes, which might indicate poorly written software, but zombies themselves do not consume resources or cause slowness. There is no evidence of swap exhaustion (Option A) or a need for patching (Option D) provided in the statistics.
According to Linux+ V8 best practices, when high I/O wait is detected, administrators should investigate disk health, controller performance, or application-level disk usage (e.g., a database performing heavy indexing).
Therefore, high storage I/O latency is the verified explanation for the server slowness.

NEW QUESTION # 22
A systems administrator is investigating bandwidth issues on a Linux file server that should be able to easily exceed 12.5MBps. The administrator inspects the following information:

Which of the following is causing the bandwidth issue?

A. The network interface enp1s0f0 has misconfigured the MTU value
B. The network interface enp1s0f0 is not using FEC mode
C. The network interface enp1s0f0 has the incorrect queue length configured
D. The network interface negotiated speed for enp1s0f0 is set too low

Answer: D

Explanation:
The interface has negotiated a speed of 100Mbps, which caps throughput to around 12.5MBps under ideal conditions. If the server should exceed that, the link is negotiating at a lower-than- expected speed (for example, it should be at 1Gbps or higher).

NEW QUESTION # 23
Users cannot access an application that is running inside containers. The administrator wants to validate whether the containers are running. Which of the following commands should the administrator use?

A. docker ps
B. docker images
C. docker start
D. docker run

Answer: A

Explanation:
The docker ps command lists all running containers, allowing the administrator to verify whether the application's containers are active.

NEW QUESTION # 24
A Linux administrator needs to compare two files and provide the output in the following format:
2,3d1
< Line 2
< Line 3
4a3
> Line 5
Which of the following commands should the administrator use to perform the task?

A. awk
B. compgen
C. file
D. diff

Answer: D

Explanation:
This command compares two files line by line and produces output in the standard ed-style format, showing deletions and additions exactly as required.

NEW QUESTION # 25
Which of the following describes how a user's public key is used during SSH authentication?

A. The user's public key is used instead of a password to allow server access.
B. The user's public key is verified against a list of authorized keys. If it is found, the user is allowed to log in.
C. The user's public key is used to encrypt the communication between the client and the server.
D. The user's public key is used to hash the password during SSH authentication.

Answer: B

Explanation:
During SSH public key authentication, the server checks if the user's public key is present in the
~/.ssh/authorized_keys file. If the key is found, the server uses it to verify the user's identity by sending a challenge that can only be answered by the corresponding private key. This process does not involve password hashing or using the public key directly for encryption of the communication stream. Instead, the public key is simply used as a reference for authentication.

NEW QUESTION # 26
......

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