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| Certification Vendor: | CompTIA |
|---|---|
| Exam Name: | CompTIA Linux+ Certification Exam (XK0-006) |
| Exam Number: | XK0-006 |
| Exam Format: | Multiple-choice questions, Performance-based questions (PBQs) |
| Related Certifications: | CompTIA Security+ CompTIA A+ CompTIA Network+ |
| Passing Score: | 720 (on a scale of 100โ900) |
| Certificate Validity Period: | 3 years |
| Exam Duration: | 90 minutes |
| Exam Price: | Approximately USD 358 (varies by region) |
| Real Exam Qty: | Maximum 90 |
| Available Languages: | English |
| Recommended Training: | CompTIA Official Training Resources CompTIA CertMaster Learn (Linux+ XK0-006) |
| Exam Registration: | Pearson VUE Exam Registration CompTIA Linux+ Official Certification Page |
| Sample Questions: | CompTIA XK0-006 Sample Questions |
| Exam Way: | Online (proctored) or onsite testing via Pearson VUE centers |
| Pre Condition: | No mandatory prerequisites, but 12โ24 months of Linux administration experience or CompTIA A+ / Network+ knowledge is recommended. |
| Official Syllabus URL: | https://www.comptia.org/certifications/linux |
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NEW QUESTION # 106
A systems administrator is configuring new Linux systems and needs to enable passwordless authentication between two of the servers. Which of the following commands should the administrator use?
Answer: A
Explanation:
Passwordless authentication using SSH key pairs is a foundational security practice covered in the Security domain of CompTIA Linux+ V8. It allows administrators to securely authenticate between systems without transmitting passwords over the network, significantly reducing the risk of credential compromise.
The correct approach involves two essential steps: generating an SSH key pair and installing the public key on the remote system. Option A correctly performs both steps using best-practice commands.
The command ssh-keygen -t rsa generates an RSA public/private key pair in the user's ~/.ssh/ directory. The private key (id_rsa) remains securely on the local system, while the public key (id_rsa.pub) is intended to be shared. The second part of the command, ssh-copy-id -i ~/.ssh/id_rsa.pub john@server2, securely copies the public key to the remote server's ~/.ssh/authorized_keys file. This enables key-based authentication for the specified user.
The other options are incorrect or incomplete. Option B uses ssh-keyscan, which is intended for collecting host keys to populate known_hosts, not for user authentication. Option C misuses ssh-agent, which manages keys already generated and does not create or install them. Option D is insecure and incorrect because copying the entire .ssh directory risks exposing private keys and violates security best practices.
Linux+ V8 documentation emphasizes the use of ssh-keygen and ssh-copy-id as the standard, secure method for configuring passwordless SSH access. This approach ensures proper permissions, correct key placement, and minimal risk.
NEW QUESTION # 107
A user states that an NFS share Is reporting random disconnections. The systems administrator obtains the following information
Which of the following best explains the symptoms that are being reported?
Answer: D
Explanation:
This issue is best analyzed using a layered troubleshooting approach, as recommended in the Troubleshooting domain of CompTIA Linux+ V8. The reported symptom is intermittent or random disconnections from an NFS share, which commonly indicates a network reliability issue rather than a configuration or filesystem problem.
The most critical evidence comes from the output of ip -s link show. The network interface enp1s0 is reporting significant numbers of errors and dropped packets on both the receive (RX) and transmit (TX) paths. High packet loss at the network interface level directly affects protocols like NFS, which rely on stable, continuous TCP/IP communication. When packets are dropped or corrupted, NFS clients may experience timeouts, retransmissions, and apparent disconnections.
Although the df -h output shows that the NFS filesystem is 95% full, this alone does not typically cause random disconnections. A nearly full filesystem may lead to write failures or performance degradation, but it does not explain intermittent connectivity loss. Linux+ V8 documentation notes that filesystem capacity issues usually present as I/O errors, not transport-layer disconnects.
Options A and B can also be ruled out. If the mount point or IP address were incorrect, the NFS share would fail consistently rather than intermittently. The fact that the share is mounted and accessible confirms that the mount configuration and IP addressing are correct.
Linux+ V8 emphasizes that NFS performance and reliability are highly sensitive to network quality. Packet errors, drops, faulty NICs, cabling issues, duplex mismatches, or driver problems commonly result in unstable NFS behavior.
Therefore, the best explanation for the reported random disconnections is D. The interface is reporting a high number of errors and dropped packets.
NEW QUESTION # 108
A new drive was recently added to a Linux system. Using the environment and tokens provided, complete the following tasks:
* Create an appropriate device label.
* Format and create an ext4 file system on the new partition.
The current working directory is /.
Answer:
Explanation:
Explanation:
To create an appropriate device label, format and create an ext4 file system on the new partition, you can use the following commands:
To create a GPT (GUID Partition Table) label on the new drive /dev/sdc, you can use the parted command with the -s option (for script mode), the device name (/dev/sdc), the mklabel command, and the label type (gpt). The command is:
parted -s /dev/sdc mklabel gpt
To create a primary partition of 10 GB on the new drive /dev/sdc, you can use the parted command with the -s option, the device name (/dev/sdc), the mkpart command, the partition type (primary), the file system type (ext4), and the start and end points of the partition (1 and 10G). The command is:
parted -s /dev/sdc mkpart primary ext4 1 10G
To format and create an ext4 file system on the new partition /dev/sdc1, you can use the mkfs command with the file system type (ext4) and the device name (/dev/sdc1). The command is:
mkfs.ext4 /dev/sdc1
You can verify that the new partition and file system have been created by using the lsblk command, which will list all block devices and their properties.
NEW QUESTION # 109
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 # 110
A systems administrator is restoring data from a backup. While analyzing the file format, the administrator sees the following output:
data: 7-zip archive data, version 0.4
Which of the following commands should the administrator use to help extract the data?
Answer: B
Explanation:
The output indicates the file is a 7-zip archive, and the 7za command is specifically designed to extract 7-zip formatted archives, making it the appropriate tool to restore the data.
NEW QUESTION # 111
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