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| Certification Vendor: | CompTIA |
|---|---|
| Exam Name: | CompTIA Linux+ Certification Exam |
| Exam Number: | XK0-006 |
| Real Exam Qty: | Up to 90 |
| Passing Score: | 720 (scale 100–900) |
| Exam Price: | $358 USD |
| Exam Duration: | 90 minutes |
| Certificate Validity Period: | 3 years |
| Related Certifications: | CompTIA A+ CompTIA Network+ CompTIA Server+ |
| Available Languages: | English |
| Exam Format: | Multiple-choice, Performance-based questions |
| Recommended Training: | CompTIA CertMaster Learn CompTIA Official Study Materials |
| Exam Registration: | CompTIA Official Registration Pearson VUE Exam Scheduling |
| Sample Questions: | CompTIA XK0-006 Sample Questions |
| Exam Way: | Online proctored or onsite at Pearson VUE testing centers |
| Pre Condition: | No mandatory prerequisites; 12 months of hands-on Linux experience or CompTIA A+/Network+/Server+ recommended |
| Official Syllabus URL: | https://www.comptia.org/certifications/linux |
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NEW QUESTION # 127
A small group of remote users needs permission to run some administrative commands on a Linux server. Which of the following approaches is the best way to address this request?
Answer: A
Explanation:
The best approach is to follow least privilege by identifying the specific administrative commands the users need and creating sudo rules that allow only those commands with elevated privileges.
NEW QUESTION # 128
Users report that a Linux system is unresponsive and simple commands take too long to complete. The Linux administrator logs in to the system and sees the following: Output 1:
10:06:29 up 235 day, 19:23, 2 users, load average: 8.71, 8.24, 7.71
Which of the following is the system experiencing?
Answer: D
Explanation:
This scenario is a classic performance troubleshooting case covered under the Troubleshooting domain of the CompTIA Linux+ V8 objectives. The key indicators to analyze are the load average values and the CPU utilization statistics.
The uptime command shows load averages of 8.71, 8.24, and 7.71 over the 1-, 5-, and 15-minute intervals.
Load average represents the average number of processes that are either running on the CPU or waiting to run. On a system with 4 CPU cores, a healthy load average would typically be close to or below 4. Load averages consistently near or above 8 indicate that there are significantly more runnable processes than available CPU resources, causing processes to wait and resulting in poor system responsiveness.
The CPU output further confirms this condition. The %idle value is 0, meaning the CPU has no idle time available. The majority of CPU time is spent in user space (65.88%) and system/kernel space (20.54%), indicating heavy computational and kernel activity. While %iowait is present at 5.65%, it is not high enough to suggest that disk I/O is the primary bottleneck.
Option C, high CPU load, best explains the symptoms. High CPU load causes commands to execute slowly because processes are competing for limited CPU time. This directly matches the observed behavior of the system being unresponsive.
The other options are incorrect. High uptime simply indicates how long the system has been running and does not cause performance issues by itself. High latency is a general term and not a specific diagnosis shown by the metrics provided. High I/O wait times would require a significantly higher %iowait value.
According to Linux+ V8 documentation, correlating load averages with CPU core count and utilization is essential for accurate performance diagnosis. Therefore, the correct answer is C. High CPU load.
NEW QUESTION # 129
A Linux administrator updates the DNS record for the company using:
cat /etc/bind/db.abc.com
The revised partial zone file is as follows:
ns1 IN A 192.168.40.251
ns2 IN A 192.168.40.252
www IN A 192.168.30.30
When the administrator attempts to resolve www.abc.com to its IP address, the domain name still points to its old IP mapping:
nslookup www.abc.com
Server: 192.168.40.251
Address: 192.168.40.251#53
Non-authoritative
Name: www.abc.com
Address: 199.168.20.81
Which of the following should the administrator execute to retrieve the updated IP mapping?
Answer: B
Explanation:
This scenario represents a classic DNS troubleshooting situation covered in the Troubleshooting domain of the CompTIA Linux+ V8 objectives. Although the DNS zone file has been updated correctly on the BIND server, the system continues to resolve the domain name to an outdated IP address. This behavior strongly indicates DNS caching rather than a configuration error in the zone file itself.
Modern Linux systems that use systemd-resolved cache DNS responses locally to improve performance and reduce external queries. Even after a DNS record is updated on the authoritative server, cached results may persist until the cache expires or is manually cleared.
The nslookup output showing a non-authoritative answer further confirms that the response is being served from a cache rather than directly from the updated zone data.
The correct solution is to flush the local DNS cache so the system can retrieve the updated record from the DNS server. The command resolvectl flush-caches clears all cached DNS entries maintained by systemd-resolved, forcing fresh queries to authoritative name servers. This aligns directly with Linux+ V8 documentation for resolving name resolution inconsistencies caused by stale cache entries.
NEW QUESTION # 130
A Linux server is not starting up because files in the /boot/partition are corrupt. After the initial GRUB screen, the following message is displayed:
Probing EDD (edd=off to disable)... ok
uncompression error
--system halted
Which of the following steps should the Linux administrator take to recover the system without destroying the existing installation? (Choose two.)
Answer: C,D
Explanation:
Using rescue boot media lets you boot the machine, mount the existing partitions, and access the corrupted /boot files without reinstalling the OS.
Reinstalling the kernel packages restores the missing or corrupt files in /boot (e.g., vmlinuz and initramfs), allowing GRUB to load and uncompress the kernel properly.
NEW QUESTION # 131
(Partial question reconstructed from visible content)
Answer: B
Explanation:
The correct answer is C. pam.conf because it is directly associated with Pluggable Authentication Modules (PAM), which provide a flexible framework for authentication in Linux systems. PAM allows administrators to configure authentication policies independently from applications, enabling centralized control over login mechanisms, password policies, and account restrictions.
The /etc/pam.conf file (or more commonly the /etc/pam.d/ directory in modern systems) defines how authentication is handled for various services such as login, SSH, sudo, and others. Each PAM configuration specifies modules that perform authentication, account validation, password management, and session handling. This modular approach enhances security and flexibility, allowing administrators to enforce consistent authentication rules across multiple services.
Option D (smb.conf) is incorrect because it is the configuration file for Samba, which is used for file sharing and interoperability between Linux and Windows systems. It does not control system authentication policies at the OS level.
From a Linux+ security perspective, understanding PAM is critical because it governs how users authenticate and how access is controlled. Misconfiguration of PAM files can lead to authentication failures or security vulnerabilities. Therefore, administrators must carefully manage PAM configurations to ensure secure and reliable access control across the system.
If you upload the full top part, I can 100% confirm the exact original wording-but based on Linux+ standards, C is definitively correct.
NEW QUESTION # 132
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