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NEW QUESTION # 14
A Linux software developer wants to use AI to optimize source code used in a commercial product. Which of the following steps should the developer take first?
- A. Research which of the available AI chatbots are best at optimizing source code.
- B. Install a private LLM to use on the internal network for source code optimization.
- C. Use open-source LLMs that undergo regular security reviews by the community.
- D. Verify that the company has a policy governing the use of AI in software development.
Answer: D
Explanation:
Before using AI on commercial source code, the developer must first ensure compliance with company policies, legal requirements, and security standards. This prevents potential intellectual property, licensing, or confidentiality issues.
NEW QUESTION # 15
Which of the following best describes a use case for playbooks in a Linux system?
- A. To provide the security information required for a container
- B. To provide the storage volume information required for a pod
- C. To provide a set of tasks and configurations to deploy an application
- D. To provide the instructions for implementing version control on a repository
Answer: C
Explanation:
In the context of Linux automation and orchestration, playbooks are most commonly associated with configuration management tools such as Ansible, which is explicitly referenced in the CompTIA Linux+ V8 objectives. Playbooks are written in YAML and are designed to define a series of tasks, configurations, and desired system states that should be applied to one or more Linux systems in a repeatable and automated manner.
A primary use case for playbooks is application deployment and system configuration automation.
Playbooks allow administrators to specify tasks such as installing packages, configuring services, managing users, setting permissions, deploying application files, and starting or enabling services. This aligns directly with option A, which accurately describes playbooks as a method to provide a set of tasks and configurations required to deploy an application consistently across environments.
The remaining options are not accurate representations of playbook functionality. Option B refers to version control implementation, which is handled by tools like Git and is not the purpose of playbooks themselves, although playbooks may be stored in version control systems. Option C describes container security information, which is typically managed through container runtime configurations, secrets, or security policies rather than playbooks. Option D refers to storage volume information for a pod, which is specific to Kubernetes manifests and not a general Linux playbook use case.
According to Linux+ V8 documentation, automation tools and playbooks help reduce human error, improve consistency, and support Infrastructure as Code (IaC) practices. Playbooks are a key mechanism for orchestrating multi-step operations across multiple systems, making them essential for modern Linux system administration.
Therefore, the correct answer is A, as it best describes the practical and documented use case for playbooks in a Linux system.
NEW QUESTION # 16
A newly hired Linux administrator needs to grant access to the Linux servers by generating a password-protected RSA key of 4096 bytes. Which of the following commands will accomplish this task?
- A. ssh-keygen -RPb 4096
- B. ssh-keygen -t dsa -B 4096
- C. ssh-keygen -t rsa -b 4096
- D. ssh-keygen -k rsa -l 4096 -p
Answer: C
Explanation:
The ssh-keygencommand is used to generate SSH key pairs. To generate an RSA key with a length of 4096 bits, the correct syntax is:
1.-t rsa: Specifies the type of key to generate, which is RSA.
2.-b 4096: Specifies the number of bits for the key, in this case 4096.
By running this command, the user will be prompted to enter a passphrase to password-protect the key, which satisfies the requirement for generating a password-protected RSA key of 4096 bits.
NEW QUESTION # 17
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 reposync available
- B. yum repo-pkgs
- C. yum list installed repos
- D. yum repolist all
Answer: D
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 # 18
A Linux administrator wants to make the enable_auth variable set to 1 and available to the environment of subsequently executed commands. Which of the following should the administrator use for this task?
- A. ENABLE_AUTH=1
- B. let ENABLE_AUTH=1
- C. ENABLE_AUTH=$(echo $ENABLE_AUTH)
- D. export ENABLE_AUTH=1
Answer: D
NEW QUESTION # 19
Users are having issues running applications. A systems administrator thinks it is an SELinux issue. Which of the following commands should the administrator use to determine whether SELinux is enabled on the system?
- A. ls -lZ /
- B. getsebool -l
- C. getenforce
- D. semanage -l
Answer: C
Explanation:
This command reports the current SELinux mode, allowing the administrator to quickly determine whether SELinux is enabled and enforcing, permissive, or disabled.
NEW QUESTION # 20
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. file
- B. compgen
- C. awk
- 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 # 21
User1 reports "access denied" errors while trying to execute app. Given the following outputs:
Which of the following options will remediate this issue?
- A. Modifying the permissions for others to grant read, write, and execute
- B. Adding user1 to the wheel group
- C. Providing execute permissions to user1 in the ACL
- D. Moving app to a different folder
Answer: C
Explanation:
According to the output of getfacl app, user1 has only "rw" (read and write) permissions, but lacks "x" (execute). Without execute permission, user1 cannot run the file. To allow user1 to execute app, you must update the ACL to add execute permission (e.g., setfacl -m u:user1:rwx app). Modifying "others" permissions (option B) is not secure or necessary, adding user1 to the wheel group (option C) is unrelated, and moving the file (option D) does not resolve permission issues.
Reference:
CompTIA Linux+ Study Guide: Exam XK0-006, Sybex, Chapter 7: "Securing Linux Systems", Section:
"Managing File and Directory Permissions and ACLs"
CompTIA Linux+ XK0-006 Objectives, Domain 3.0: Security
NEW QUESTION # 22
A Linux administrator observes a low network throughput on a Linux system. The Linux administrator gathers the following output:
Which of the following is the cause of a low network throughput?
- A. MTU mismatch
- B. Hardware limitations
- C. Driver issue
- D. Duplex configuration issue
Answer: A
Explanation:
The interface is configured with a jumbo MTU, and the ping test with the do-not-fragment flag shows fragmentation errors, indicating that packets larger than the path MTU cannot be transmitted. This MTU mismatch causes fragmentation or dropped packets, resulting in reduced network throughput.
NEW QUESTION # 23
Which of the following does dmesgdisplay?
- A. USB device connections
- B. "Session closed" messages
- C. Window manager warnings
- D. Incorrect login attempts
Answer: A
Explanation:
This command displays kernel ring buffer messages, which include hardware-related events such as device initialization and USB device connections.
NEW QUESTION # 24
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. modprobe bluetooth
- D. modinfo bluetooth
Answer: D
Explanation:
The modinfo command displays detailed information about a kernel module, including its version, author, description, and parameters.
NEW QUESTION # 25
A DevOps engineer made some changes to files on a local repository. The engineer realizes that the changes broke the application and the changes need to be reverted back. Which of the following commands is the best way to accomplish this task?
- A. git stash
- B. git pull
- C. git reset
- D. git rebase
Answer: C
Explanation:
The git reset command reverts changes in the local repository to a previous commit, effectively discarding the problematic modifications and restoring the application to a working state.
NEW QUESTION # 26
Which of the following technologies is used to authenticate users on a Linux server when working in a Windows domain?
- A. Kerberos
- B. SSH Daemon
- C. Samba
- D. PAM
Answer: A
Explanation:
Kerberos provides centralized, ticket-based authentication and is the core authentication mechanism used by Windows Active Directory, allowing Linux systems joined to a Windows domain to authenticate users securely.
NEW QUESTION # 27
An
administrator is investigating the reason a Linux workstation is not resolving the website http://www.comptia.
org. The administrator executes some commands and receives the following output:
Which of the following is the most likely cause?
- A. The nameserver in /etc/resolv.conf needs to be updated to 8.8.8.8
- B. The firewall needs to be modified to allow outbound HTTP and HTTPS.
- C. The static entry needs to be removed from /etc/hosts.
- D. The remote website does not support IPv6, and the workstation requires it.
Answer: C
Explanation:
When troubleshooting name resolution issues in Linux, /etc/hosts entries take precedence over DNS lookups.
The workstation's /etc/hosts file contains the line:
CopyEdit
104.18.99.101 www.comptia.org
This means any attempt to access www.comptia.org will resolve to 104.18.99.101, regardless of the real DNS response. However, both dig and nslookup show the correct IP as 104.18.16.29. Because the local /etc/hosts entry overrides DNS, and the hardcoded IP is either incorrect or unreachable, all network traffic to www.
comptia.org will fail or not reach the intended destination, resulting in the observed connectivity issue (Destination Host Unreachable).
Other options:
* B. The lack of IPv6 support is irrelevant since the host is using IPv4 and the DNS queries for IPv4 (A record) are successful.
* C. The firewall would block all HTTP/HTTPS connections, but the error shown is a host unreachable, not a port-specific issue.
* D. The nameserver is working; both dig and nslookup queries succeed and return the correct A record.
Reference:
CompTIA Linux+ Study Guide: Exam XK0-006, Sybex, Chapter 8: "Networking Fundamentals", Section:
"Troubleshooting Name Resolution"
CompTIA Linux+ XK0-006 Objectives, Domain 2.0: Networking
NEW QUESTION # 28
A Linux systems administrator is running an important maintenance task that consumes a large amount of CPU, causing other applications to slow. Which of the following actions should the administrator take to help alleviate the issue?
- A. Run the maintenance task with nohup.
- B. Lower the priority of the maintenance task with renice.
- C. Increase the available CPU time with pidstat.
- D. Execute the other applications with the bg utility.
Answer: B
Explanation:
Process scheduling and resource management are essential Linux administration skills covered in Linux+ V8.
When a process consumes excessive CPU resources, it can negatively impact overall system performance.
The correct solution is to lower the priority of the CPU-intensive task using the renice command. Niceness values influence how much CPU time a process receives relative to others. Increasing the niceness value reduces the process's priority, allowing other applications to receive CPU resources more fairly.
Option B directly addresses the issue. The other options do not. pidstat monitors processes but does not modify CPU allocation. nohup allows a process to continue running after logout but does not affect scheduling priority. bg resumes a stopped job in the background but does not reduce CPU usage.
Linux+ V8 documentation explicitly references nice and renice for managing CPU contention. Therefore, the correct answer is B.
NEW QUESTION # 29
A Linux administrator is creating a symbolic link /home/docsleading to the
/usr/share/documents/directory. Which of the following commands allows the administrator to achieve this goal?
- A. ln -s /usr/share/documents /home/docs
- B. link /usr/share/documents /home/docs
- C. rsync /usr/share/documents /home/docs
- D. lsof /usr/share/documents /home/docs
Answer: A
Explanation:
This command creates a symbolic link at the specified path that points to the target directory, allowing access to the target through the new link location.
NEW QUESTION # 30
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?
- A. ssh-agent -i rsa $$ ssh-copy-id ~/.ssh/key john@server2
- B. ssh-keygen -t rsa $$ ssh-copy-id -i ~/.ssh/id_rsa.pub john@server2
- C. ssh-keyscan -t rsa $$ ssh-copy-id john@server2 -i ~/.ssh/key
- D. ssh-add -t rsa $$ scp -rp ~/.ssh john@server2
Answer: B
Explanation:
ssh-keygen -t rsa generates an RSA key pair.
ssh-copy-id -i ~/.ssh/id_rsa.pub john@server2 copies the public key to the remote server's authorized_keys, enabling passwordless login.
NEW QUESTION # 31
A Linux administrator attempts to unmount the local filesystem /datain order to mount a new volume. However, the administrator receives the following error message:
umount: /data: target is busy
Which of the following commands should the administrator run to resolve the issue?
- A. tree -g /data
- B. stat -f /data
- C. ls -ld /data
- D. fuser -mk /data
Answer: D
Explanation:
The fuser command identifies and terminates processes that are actively using the /data filesystem, allowing it to be safely unmounted once those processes are stopped.
NEW QUESTION # 32
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?
- A. ssh-agent -i rsa && ssh-copy-id ~/.ssh/key john@server2
- B. ssh-keygen -t rsa && ssh-copy-id -i ~/.ssh/id_rsa.pub john@server2
- C. ssh-add -t rsa && scp -rp ~/.ssh john@server2
- D. ssh-keyscan -t rsa && ssh-copy-id john@server2 -i ~/.ssh/key
Answer: B
Explanation:
This command generates an SSH key pair and securely copies the public key to the remote server, enabling passwordless authentication by allowing key-based SSH login between the systems.
NEW QUESTION # 33
Which of the following is the best way to create a non-interactive account in a Linux system?
- A. By using adduser with no password
- B. With no elevated privileges
- C. With no home directory
- D. With the shell set to /sbin/nologin
Answer: D
Explanation:
Setting the user's shell to /sbin/nologin prevents interactive logins while still allowing the account to exist for services or background processes, which is the standard method for creating non- interactive accounts.
NEW QUESTION # 34
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. modprobe bluetooth
- D. modinfo bluetooth
Answer: D
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 # 35
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 reposync available
- B. yum repo-pkgs
- C. yum list installed repos
- D. yum repolist all
Answer: D
Explanation:
The yum repolist all command lists all configured repositories along with their status (enabled or disabled), allowing the administrator to verify if the problematic repository is installed and active.
NEW QUESTION # 36
A DevOps engineer made some changes to files in a local repository. The engineer realizes that the changes broke the application and the changes need to be reverted back. Which of the following commands is the best way to accomplish this task?
- A. git stash
- B. git pull
- C. git reset
- D. git rebase
Answer: C
Explanation:
Version control rollback operations are a core DevOps skill covered in the Linux+ V8 objectives. When changes in a local Git repository break an application and must be reverted, the administrator must choose a command that directly undoes those changes.
The command git reset is the most appropriate option in this scenario. It allows the engineer to move the current branch pointer (HEAD) to a previous commit, effectively discarding or undoing local changes.
Depending on the reset mode (--soft, --mixed, or --hard), the engineer can control whether changes are preserved in the staging area or working directory. This flexibility makes git reset the primary tool for reverting problematic local changes.
The other options are not suitable. git pull fetches and merges changes from a remote repository and does not revert local modifications. git rebase rewrites commit history and is used to reapply commits on top of another base, not to undo broken changes. git stash temporarily saves uncommitted changes for later use but does not revert the repository to a stable state.
Linux+ V8 documentation emphasizes that git reset is commonly used during local development when changes need to be undone quickly before being shared with others. Therefore, the correct answer is B.
NEW QUESTION # 37
A Linux administrator needs to create and then connect to the app-01-imagecontainer. Which of the following commands accomplishes this task?
- A. docker build -ic app-01-image
- B. docker start -td app-01-image
- C. docker exec -dc app-01-image
- D. docker run -it app-01-image
Answer: D
Explanation:
The docker run -it command both creates a new container from the specified image and attaches to it interactively, which is exactly what the administrator needs.
NEW QUESTION # 38
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