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NEW QUESTION # 193
A junior system administrator removed an LVM volume by mistake.
INSTRUCTIONS
Part 1
Review the output and select the appropriate command to begin the recovery process.
Part 2
Review the output and select the appropriate command to continue the recovery process.
Part 3
Review the output and select the appropriate command to complete the recovery process and access the underlying data.
Answer:
Explanation:
Explanation:
Part 1 - Begin the recovery process
The answer:
vgcfgrestore vg01 -f /etc/lvm/archive/vg01_00001-810050352.vg
Part 2 - Continue the recovery process
The answer:
lvchange -ay /dev/vg01/lv01
Part 3 - Complete recovery and access data
The answer:
mount /dev/vg01/lv01 /important_data
This performance-based question tests LVM recovery, a critical System Management skill in CompTIA Linux+ V8. The scenario indicates that a logical volume was removed, but the underlying physical volume and volume group metadata still exist.
# Part 1: Restoring Volume Group Metadata
The first screenshot shows that:
* Physical volumes (pvdisplay, pvs) still exist
* The logical volume is missing
* /etc/lvm/archive/ contains archived VG metadata
Linux automatically stores backups of LVM metadata in /etc/lvm/archive whenever changes are made. The correct first step is to restore the volume group metadata using:
vgcfgrestore vg01 -f /etc/lvm/archive/vg01_00001-810050352.vg
This restores the logical volume definitions but does not activate them yet.
This is the only correct starting point in Linux+ V8 recovery workflows.
# Part 2: Activating the Logical Volume
After metadata restoration:
* The LV exists but is inactive
* blkid shows the LV as TYPE="LVM2_member"
The logical volume must be activated before it can be mounted:
lvchange -ay /dev/vg01/lv01
This makes the LV available under /dev/vg01/lv01.
Linux+ explicitly requires LV activation after recovery.
# Part 3: Accessing the Data
The final output shows:
* The filesystem type is xfs
* The logical volume is now visible
Since there is no indication of filesystem corruption, no repair is required.
The correct final step is to mount the filesystem:
mount /dev/vg01/lv01 /important_data
This restores full access to the underlying data.
NEW QUESTION # 194
Which of the following filesystems contains non-persistent or volatile data?
Answer: A
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 # 195
Joe, a user, has taken a position previously held by Ann. As a systems administrator, you need to archive all the files from Ann's home directory and extract them into Joe's home directory.
INSTRUCTIONS
Within each tab, click on an object to form the appropriate commands. Command objects may only be used once, but the spacebar _ object may be used multiple times. Not all objects will be used.
If at any time you would like to bring back the initial state of the simulation, please click the Reset All button.
Answer:
Explanation:
See the solution in Explanation below.
Explanation:
Archive Tab - Create the archive from Ann's home directory
Correct Command:
tar -cvf /tmp/ann.tar -C /home/ ann
Extract Tab - Extract the archive into Joe's home directory
Correct Command:
tar -xvf /tmp/ann.tar -C /home/ joe
This performance-based question tests file archiving and restoration using tar, a core System Management skill in the CompTIA Linux+ V8 objectives. The task requires preserving Ann's files and placing them correctly into Joe's home directory.
# Archive Phase Explanation
The goal of the first step is to archive Ann's entire home directory without embedding the full path (/home
/ann) inside the archive. This is accomplished using the -C option.
Command breakdown:
* tar # archive utility
* -c # create an archive
* -v # verbose output (optional but allowed)
* -f /tmp/ann.tar # specifies the archive file
* -C /home/ # changes directory before archiving
* ann # archives the ann directory only
This results in a clean archive containing Ann's files without absolute paths, which is best practice and explicitly covered in Linux+ V8 documentation.
# Extract Phase Explanation
The second step extracts the archived files into Joe's home directory.
Command breakdown:
* -x # extract
* -v # verbose
* -f /tmp/ann.tar # specifies the archive
* -C /home/joe # extracts files directly into Joe's home directory
This ensures Joe receives Ann's files correctly under /home/joe/ann or directly under /home/joe depending on post-extraction handling, which matches Linux+ expectations for administrative user transitions.
NEW QUESTION # 196
Users cannot access a server after it has been restarted. At the server console, the administrator runs the following commands;
Which of the following is the cause of the issue?
Answer: B
Explanation:
This issue is a classic example of post-reboot connectivity troubleshooting, which falls under the Troubleshooting domain of CompTIA Linux+ V8. The administrator has correctly gathered evidence using multiple diagnostic tools, allowing the root cause to be identified through correlation.
The ss -lnt output confirms that the SSH daemon is running and listening on TCP port 22. This eliminates the possibility that the SSH service failed to start after reboot. Additionally, the uptime output shows a very low load average, indicating that system performance is not a limiting factor. The successful ping test confirms that the server is reachable at the network layer and that DNS resolution and basic connectivity are functioning correctly.
The critical clue comes from the firewall configuration. The output of firewall-cmd --list-all shows that only specific services are allowed through the firewall, such as https, dns, and cockpit. The SSH service is notably absent. On systems using firewalld, services must be explicitly allowed, even if the daemon itself is running and listening on the correct port.
As a result, incoming SSH connection attempts are being blocked by the firewall, preventing users from accessing the server remotely after reboot. This aligns precisely with option B.
The other options are incorrect. DNS is functioning, as shown by successful ping responses. System load is low and not contributing to the issue. There is no indication that users are attempting to access the web server using an incorrect protocol.
Linux+ V8 documentation emphasizes that administrators must verify both service status and firewall rules when diagnosing access issues. In this case, allowing SSH with a command such as firewall-cmd --add- service=ssh --permanent followed by a reload would resolve the problem.
NEW QUESTION # 197
The security manager at a company notifies a systems administrator of open vulnerabilities on the Linux system. The administrator receives the following information while logged in to the server:
Which of the following is the most likely security concern?
Answer: C
Explanation:
The package management history shows that the last system update occurred over a year ago, which strongly indicates that security patches and vulnerability fixes have not been applied, leaving the system exposed to known vulnerabilities.
NEW QUESTION # 198
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