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No doubt the CompTIA Linux+ Certification Exam (XK0-006) certification is one of the most challenging certification exams in the market. This CompTIA XK0-006 certification exam gives always a tough time to CompTIA Linux+ Certification Exam (XK0-006) exam candidates. The BraindumpQuiz understands this hurdle and offers recommended and real CompTIA XK0-006 exam practice questions in three different formats.
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Which of the following filesystems contains non-persistent or volatile data?
A. /usr
B. /var
C. /boot
D. /proc
Answer: D
Explanation:
Understanding Linux filesystems and their purposes is a fundamental system management skill outlined in the Linux+ V8 objectives. Among the listed options, /proc is the filesystem that contains non-persistent, volatile data.
The /proc filesystem is a virtual filesystem that exists entirely in memory and is dynamically generated by the Linux kernel. It does not store data on disk and does not persist across system reboots. Instead, /proc provides real-time information about running processes, kernel parameters, system memory, CPU statistics, and hardware state. Files within /proc represent kernel data structures and change constantly as the system operates.
The other filesystems contain persistent data stored on disk. /boot stores bootloader files and kernel images, which are critical for system startup. /usr contains user applications, libraries, and documentation, all of which are persistent. /var holds variable data such as logs, spool files, and caches, which may change frequently but are still stored persistently on disk.
Linux+ V8 documentation emphasizes that /proc is used primarily for system monitoring and tuning.
Administrators often interact with /proc to inspect process details or modify kernel parameters using tools like sysctl. Because its contents are generated at runtime and cleared on reboot, /proc is classified as non-persistent or volatile.
Therefore, the correct answer is C. /proc.
NEW QUESTION # 36
An administrator attempts to install updates on a Linux system but receives error messages regarding a specific repository. Which of the following commands should the administrator use to verify that the repository is installed and enabled?
A. yum repo-pkgs
B. yum repolist all
C. yum reposync available
D. yum list installed repos
Answer: B
Explanation:
Package management troubleshooting is an important skill in Linux+ V8, especially on RPM-based distributions that use yum or dnf. When update errors reference a repository, the administrator must verify whether the repository exists and whether it is enabled.
The command yum repolist all displays all configured repositories, including those that are enabled, disabled, or temporarily unavailable. This makes it the most effective command for diagnosing repository-related issues. It allows administrators to quickly confirm the repository's status and take corrective action, such as enabling it or fixing configuration errors.
The other options are incorrect. yum repo-pkgs manages packages within a repository but does not list repository status. yum list installed repos is not a valid yum command. yum reposync is used to mirror repositories locally and is not intended for verification.
Linux+ V8 documentation highlights yum repolist all as the standard command for repository inspection and troubleshooting.
Therefore, the correct answer is D. yum repolist all.
NEW QUESTION # 37
Which of the following best describes journald?
A. A system service that collects and stores logging data
B. A service responsible for writing audit records to a disk
C. A feature that creates crash dumps in case of kernel failure
D. A service responsible for keeping the filesystem journal
Answer: A
Explanation:
journald, part of systemd, is the core logging service in modern Linux systems and is covered under Linux+ V8 logging and monitoring objectives.
The correct description is A. systemd-journald collects, stores, and indexes logging data from the kernel, system services, and applications. Logs are stored in a structured, binary format and can be queried using journalctl. Journald supports metadata tagging, log filtering, and centralized logging integration.
Option B refers to kernel crash dump mechanisms like kdump. Option C describes filesystem journaling (such as ext4 journaling). Option D refers to auditd, which manages security audit logs.
Linux+ V8 documentation clearly distinguishes journald from other logging and auditing services. Therefore, the correct answer is A.
NEW QUESTION # 38
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 answer:
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.
The other options are incorrect for the following reasons. systemd-resolve query www.abc.com performs a DNS lookup but does not clear cached entries. systemd-resolve status only displays resolver configuration and statistics. service nslcd reload reloads the Name Service LDAP daemon and is unrelated to DNS resolution or caching.
Linux+ V8 emphasizes identifying whether issues originate from services, configuration, or cached data. In this case, flushing the DNS cache is the correct and least disruptive corrective action.
Therefore, the correct answer is D. resolvectl flush-caches.
NEW QUESTION # 39
Which of the following commands should a Linux administrator use to determine the version of a kernel module?
A. depmod bluetooth
B. lsmod bluetooth
C. modinfo bluetooth
D. modprobe bluetooth
Answer: C
Explanation:
Kernel module management is an important part of Linux system administration and is covered in the Linux+ V8 objectives. When an administrator needs to determine metadata about a kernel module-such as its version, author, description, license, filename, and dependencies-the correct tool is modinfo.
The command modinfo bluetooth displays detailed information about the specified kernel module, including the module version if it is defined. This makes it the correct and intended command for retrieving version details of kernel modules, whether or not the module is currently loaded.
The other options are incorrect. modprobe bluetooth is used to load or unload kernel modules and does not display version information. lsmod lists loaded modules but does not show version details and does not accept module names as arguments in that manner. depmod is used to generate module dependency information and does not provide module metadata to the administrator.
Linux+ V8 documentation specifically references modinfo as the utility for inspecting kernel module properties. This command is essential for troubleshooting driver issues, verifying compatibility, and auditing kernel components.
Therefore, the correct answer is D. modinfo bluetooth.
NEW QUESTION # 40
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