[Nov 08, 2023] Pass Linux+ XK0-005 Exam With 224 Questions
Ultimate Guide to Prepare Free CompTIA XK0-005 Exam Questions and Answer
CompTIA XK0-005 exam is ideal for individuals who want to pursue a career in Linux system administration. CompTIA Linux+ Certification Exam certification is also suitable for IT professionals who want to enhance their skills and knowledge in Linux system administration. CompTIA Linux+ Certification Exam certification validates the candidate's ability to work with Linux systems in various environments, including cloud, servers, and mobile devices. CompTIA Linux+ Certification Exam certification is vendor-neutral, which means it is not specific to any Linux distribution or technology.
NEW QUESTION # 84
A Linux administrator has togged in to a server for the first time and needs to know which services are allowed through the firewall. Which of the following options will return the results for which the administrator is looking?
- A. firewall-cmd -list-services
- B. firewall-cmd -get-services
- C. systemctl status firewalld
- D. firewall-cmd -check-config
Answer: A
NEW QUESTION # 85
A junior administrator is trying to set up a passwordless SSH connection to one of the servers. The administrator follows the instructions and puts the key in the authorized_key file at the server, but the administrator is still asked to provide a password during the connection.
Given the following output:
Which of the following commands would resolve the issue and allow an SSH connection to be established without a password?
- A. restorecon -rv .ssh/authorized_key
- B. mv .ssh/authorized_key .ssh/authorized_keys
- C. chmod 600 mv .ssh/authorized_key
- D. systemctl restart sshd.service
Answer: B
NEW QUESTION # 86
Due to low disk space, a Linux administrator finding and removing all log files that were modified more than
180 days ago. Which of the following commands will accomplish this task?
- A. find /var/log -type f -modified +180 -rm
- B. find /var/log -type f -mtime +180 -exec rm {} \
- C. find /var/log -type c -atime +180 -remove
- D. find /var/log -type d -mtime +180 -print -exec rm {} \;
Answer: B
Explanation:
Explanation
The command that will accomplish the task of finding and removing all log files that were modified more than
180 days ago is find /var/log -type f -mtime +180 -exec rm {} ;. This command will use find to search for files (-type f) under /var/log directory that have a modification time (-mtime) older than 180 days (+180). For each matching file, it will execute (-exec) the rm command to delete it, passing the file name as an argument ({}).
The command will end with a semicolon (;), which is escaped with a backslash to prevent shell interpretation.
The other options are not correct commands for accomplishing the task. The find /var/log -type d -mtime +180
-print -exec rm {} ; command will search for directories (-type d) instead of files, and print their names (-print) before deleting them. This is not what the task requires. The find /var/log -type f -modified +180 -rm command is invalid because there is no such option as -modified or -rm for find. The correct options are
-mtime and -delete, respectively. The find /var/log -type c -atime +180 -remove command is also invalid because there is no such option as -remove for find. Moreover, it will search for character special files (-type c) instead of regular files, and use access time (-atime) instead of modification time. References: find(1) - Linux manual page; Find and delete files older than n days in Linux
NEW QUESTION # 87
A Linux administrator is installing a web server and needs to check whether web traffic has already been allowed through the firewall. Which of the following commands should the administrator use to accomplish this task?
- A. firewalld --check-service http
- B. firewall-cmd --check-service http
- C. firewall-cmd --query-service http
- D. firewalld query-service-http
Answer: C
NEW QUESTION # 88
What is the main objective when using Application Control?
- A. To see what users are doing.
- B. To filter out specific content.
- C. Ensure security and privacy of information.
- D. To assist the firewall blade with handling traffic.
Answer: C
Explanation:
Explanation
The main objective when using Application Control is to ensure the security and privacy of information.
Application Control is a security practice that blocks or restricts unauthorized applications from executing in ways that put data at risk. The control functions vary based on the business purpose of the specific application, but the main objective is to help ensure the privacy and security of data used by and transmitted between applications1. Application Control can also prevent malware, untrusted, or unwanted applications from running on the network, reducing the risks and costs associated with data breaches1. Application Control can also improve the overall network stability and performance by eliminating unnecessary or harmful applications1.
Application Control is not mainly used to filter out specific content, although it can be combined with other technologies such as URL filtering or content filtering to achieve that goal. Application Control is not mainly used to assist the firewall blade with handling traffic, although it can be integrated with firewall policies to enforce granular access rules based on applications. Application Control is not mainly used to see what users are doing, although it can provide visibility and reporting on application usage and activity.
NEW QUESTION # 89
A Linux administrator is providing a new Nginx image from the registry to local cache. Which of the following commands would allow this to happen?
- A. docker import nginx
- B. docker attach nginx
- C. docker commit nginx
- D. docker pull nginx
Answer: D
Explanation:
Explanation
The command that would allow this to happen is docker pull nginx. Docker is a software platform that allows the administrator to create, run, and manage containers on Linux systems. Containers are isolated and lightweight environments that can run applications and services without affecting the host system. Docker uses images to create containers, which are files that contain the code, libraries, dependencies, and configuration of the applications and services. Docker uses a registry to store and distribute images, which is a service that hosts and serves images. Docker Hub is the default public registry that provides a large number of official and community images. Nginx is a popular web server and reverse proxy that can run as a container. The command docker pull nginx will download the latest version of the Nginx image from the Docker Hub registry to the local cache, which is the storage location for the images on the host system. This will allow the administrator to provide a new Nginx image from the registry to the local cache. This is the correct command to use to accomplish the task. The other options are incorrect because they either do not download an image from the registry (docker attach nginx or docker commit nginx) or do not exist (docker import nginx). References: CompTIA Linux+ (XK0-005) Certification Study Guide, Chapter 19: Managing Cloud and Virtualization Technologies, page 571.
NEW QUESTION # 90
A systems administrator is tasked with creating a cloud-based server with a public IP address.
Which of the following technologies did the systems administrator use to complete this task?
- A. Puppet
- B. Git
- C. Ansible
- D. Terraform
Answer: D
Explanation:
Explanation
The systems administrator used Terraform to create a cloud-based server with a public IP address. Terraform is a tool for building, changing, and versioning infrastructure as code. Terraform can create and manage resources on different cloud platforms, such as AWS, Azure, or Google Cloud. Terraform uses a declarative syntax to describe the desired state of the infrastructure and applies the changes accordingly. Terraform can also assign a public IP address to a cloud server by using the appropriate resource attributes. This is the correct technology that the systems administrator used to complete the task. The other options are incorrect because they are either not designed for creating cloud servers (Puppet or Git) or not capable of assigning public IP addresses (Ansible). References: CompTIA Linux+ (XK0-005) Certification Study Guide, Chapter 19:
Managing Cloud and Virtualization Technologies, page 559.
NEW QUESTION # 91
Users have reported that the interactive sessions were lost on a Linux server. A Linux administrator verifies the server was switched to rescue.target mode for maintenance. Which of the following commands will restore the server to its usual target?
- A. systemctl get-default
- B. systemctl reboot
- C. systemctl emergency
- D. telinit 0
Answer: B
NEW QUESTION # 92
A systems administrator configured firewall rules using firewalld. However, after the system is rebooted, the firewall rules are not present:
The systems administrator makes additional checks:
Which of the following is the reason the firewall rules are not active?
- A. iptables is conflicting with firewalld.
- B. The firewalld service is not enabled.
- C. FIREWALL_ARGS has no value assigned.
- D. The wrong system target is activated.
Answer: B
Explanation:
The reason the firewall rules are not active is that the firewalld service is not enabled. This means that the service will not start automatically at boot time or after a system reload. To enable the firewalld service, the systems administrator needs to use the command sudo systemctl enable firewalld. This will create a symbolic link from the firewalld service file to the appropriate systemd target, such as multi-user.target. Enabling the service does not start it immediately, so the systems administrator also needs to use the command sudo systemctl start firewalld or sudo systemctl reload firewalld to activate the firewall rules.
The other options are not correct reasons for the firewall rules not being active. iptables is not conflicting with firewalld, because firewalld uses iptables as its backend by default. The wrong system target is not activated, because firewalld is independent of the system target and can be enabled for any target. FIREWALL_ARGS has no value assigned, but this is not a problem, because FIREWALL_ARGS is an optional environment variable that can be used to pass additional arguments to the firewalld daemon, such as --debug or --nofork. If FIREWALL_ARGS is empty or not defined, firewalld will use its default arguments. Reference: firewalld.service(8) - Linux manual page; firewall-cmd(1) - Linux manual page; systemctl(1) - Linux manual page
NEW QUESTION # 93
A Linux administrator is troubleshooting SSH connection issues from one of the workstations.
When users attempt to log in from the workstation to a server with the IP address 104.21.75.76, they receive the following message:
The administrator reviews the information below:
Which of the following is causing the connectivity issue?
- A. The server has an incorrect default gateway configuration.
- B. The server's firewall is preventing connections from being made.
- C. The sshd service is disabled.
- D. The workstation has the wrong IP settings.
Answer: B
Explanation:
The server's firewall is preventing connections from being made, which is causing the connectivity issue. The output of iptables -L -n shows that the firewall is blocking all incoming traffic on port 22, which is the default port for SSH. The output of ssh -v [email protected] shows that the connection is refused by the server. To resolve the issue, the administrator needs to allow port 22 on the firewall. The other options are incorrect because they are not supported by the outputs. The workstation has the correct IP settings, as shown by the output of ip addr show. The sshd service is enabled and running, as shown by the output of systemctl status sshd. The server has the correct default gateway configuration, as shown by the output of ip route show. Reference: CompTIA Linux+ (XK0-005) Certification Study Guide, Chapter 13: Managing Network Services, pages 406-407.
NEW QUESTION # 94
Junior system administrator had trouble installing and running an Apache web server on a Linux server. You have been tasked with installing the Apache web server on the Linux server and resolving the issue that prevented the junior administrator from running Apache.
INSTRUCTIONS
Install Apache and start the service. Verify that the Apache service is running with the defaults.
Typing "help" in the terminal will show a list of relevant event commands.
If at any time you would like to bring back the initial state of the simulation, please click the Reset All button.
Answer:
Explanation:
yum install httpd
systemctl --now enable httpd
systemctl status httpd
netstat -tunlp | grep 80
pkill <processname>
systemctl restart httpd
systemctl status httpd
NEW QUESTION # 95
A Linux administrator needs to analyze a failing application that is running inside a container. Which of the following commands allows the Linux administrator to enter the running container and analyze the logs that are stored inside?
- A. docker run -ti app /bin/sh
- B. podman run -d app /bin/bash
- C. docker exec -d app /bin/bash
- D. podman exec -ti app /bin/sh
Answer: D
Explanation:
Podman exec -ti app /bin/sh allows the Linux administrator to enter the running container and analyze the logs that are stored inside. This command uses the podman tool, which is a daemonless container engine that can run and manage containers on Linux systems. The exec option executes a command inside an existing container, in this case app, which is the name of the container that runs the failing application. The -ti option allocates a pseudo-TTY and keeps STDIN open, allowing for interactive shell access to the container. The /bin/sh argument specifies the shell command to run inside the container, which can be used to view and manipulate the log files.
The other options are not correct commands for entering a running container and analyzing the logs. Docker run -ti app /bin/sh creates a new container from the app image and runs the /bin/sh command inside it, but does not enter the existing container that runs the failing application. Podman run -d app /bin/bash also creates a new container from the app image and runs the /bin/bash command inside it, but does so in detached mode, meaning that it runs in the background without interactive shell access. Docker exec -d app /bin/bash executes the /bin/bash command inside the existing app container, but also does so in detached mode, without interactive shell access.
NEW QUESTION # 96
One leg of an LVM-mirrored volume failed due to the underlying physical volume, and a systems administrator is troubleshooting the issue. The following output has been provided:
Given this scenario, which of the following should the administrator do to recover this volume?
- A. Recreate the logical volume.
- B. Reboot the server. The volume will automatically go back to linear mode.
- C. Reboot the server. The volume will revert to stripe mode.
- D. Replace the failed drive and reconfigure the mirror.
Answer: D
Explanation:
The administrator should replace the failed drive and reconfigure the mirror to recover the volume. The LVM (Logical Volume Manager) is a tool for managing disk space on Linux systems. The LVM allows the administrator to create logical volumes that span across multiple physical volumes, such as hard disks or partitions. The LVM also supports different types of logical volumes, such as linear, striped, or mirrored. A mirrored logical volume is a type of logical volume that creates a copy of the data on another physical volume, providing redundancy and fault tolerance. The output shows that the logical volume is mirrored and that one leg of the mirror has failed due to the underlying physical volume. This means that one of the physical volumes that contains the data of the logical volume is damaged or missing. This can cause data loss and performance degradation. The administrator should replace the failed drive and reconfigure the mirror to recover the volume. The administrator should identify the failed physical volume by using commands such as pvdisplay, vgdisplay, or lvdisplay. The administrator should then remove the failed physical volume from the volume group by using the vgreduce command. The administrator should then install a new drive and create a new physical volume by using the pvcreate command. The administrator should then add the new physical volume to the volume group by using the vgextend command. The administrator should then reconfigure the mirror by using the lvconvert command. The administrator should replace the failed drive and reconfigure the mirror to recover the volume. This is the correct answer to the question. The other options are incorrect because they either do not recover the volume (reboot the server. The volume will automatically go back to linear mode or reboot the server. The volume will revert to stripe mode) or do not preserve the data of the volume (recreate the logical volume). Reference: CompTIA Linux+ (XK0-005) Certification Study Guide, Chapter 10: Managing Storage, pages 333-334.
NEW QUESTION # 97
A Linux administrator booted up the server and was presented with a non-GUI terminal. The administrator ran the command systemctl isolate graphical.target and rebooted the system by running systemctl reboot, which fixed the issue. However, the next day the administrator was presented again with a non-GUI terminal. Which of the following is the issue?
- A. The administrator did not set the default target to graphical.target.
- B. The administrator did not shut down the server properly.
- C. The administrator did not set the default target to basic.target.
- D. The administrator did not reboot the server properly.
Answer: A
Explanation:
The issue is that the administrator did not set the default target to graphical.target. A target is a unit of systemd that groups together other units by a common purpose or state. The graphical.target is a target that starts the graphical user interface (GUI) along with other services. The administrator used the command systemctl isolate graphical.target to switch to this target temporarily, but this does not change the default target that is activated at boot time. To make this change permanent, the administrator should have used the command systemctl set-default graphical.target, which creates a symbolic link from /etc/systemd/system/default.target to /usr/lib/systemd/system/graphical.target.
The other options are not correct explanations for the issue. The administrator did reboot the server properly by using systemctl reboot, which shuts down and restarts the system cleanly. The administrator did not need to set the default target to basic.target, which is a minimal target that only starts essential services. The administrator did not shut down the server improperly, which could have caused file system corruption or data loss, but not affect the default target. Reference: systemctl(1) - Linux manual page; How to Change Runlevels (targets) in SystemD
NEW QUESTION # 98
As a Systems Administrator, to reduce disk space, you were tasked to create a shell script that does the following:
Add relevant content to /tmp/script.sh, so that it finds and compresses rotated files in /var/log without recursion.
INSTRUCTIONS
Fill the blanks to build a script that performs the actual compression of rotated log files.
If at any time you would like to bring back the initial state of the simulation, please click the Reset All button.
Answer:
Explanation:
NEW QUESTION # 99
A Linux systems administrator is troubleshooting an I/O latency on a single CPU server. The administrator runs a top command and receives the following output:
%Cpu(s): 0.2 us, 33.1 sy, 0.0 ni, 0.0 id, 52.4 wa, 0.0 hi, 0.2 si, 0.0 st Which of the following is correct based on the output received from the executed command?
- A. The server's CPU value for the time spent on system processes is low.
- B. The server's CPU is spending too much time waiting for data inputs.
- C. The server's CPU is taking too long to process users' requests.
- D. The server's CPU shows a high idle-time value.
Answer: B
Explanation:
The server's CPU is spending too much time waiting for data inputs. This can be inferred from the output of the top command, which shows the percentage of CPU time spent in different states. The wa state stands for wait, and it indicates that the CPU is idle while waiting for an I/O operation to complete. In this case, the wa state is 52.4%, which means that more than half of the CPU time is wasted on waiting for data inputs. This can cause a high I/O latency and affect the performance of the server.
The other options are not correct based on the output received from the executed command. The server's CPU is not taking too long to process users' requests, because the us state, which stands for user, is only 0.2%, which means that the CPU is barely used by user processes. The server's CPU does not show a high idle-time value, because the id state, which stands for idle, is 0.0%, which means that the CPU is not idle at all. The server's CPU value for the time spent on system processes is not low, because the sy state, which stands for system, is 33.1%, which means that the CPU is heavily used by system processes.
NEW QUESTION # 100
An administrator attempts to rename a file on a server but receives the following error.
The administrator then runs a few commands and obtains the following output:
Which of the following commands should the administrator run NEXT to allow the file to be renamed by any user?
- A. chmod -t files
- B. chgrp reet files
- C. chacl -R 644 files
- D. chown users files
Answer: A
NEW QUESTION # 101
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CompTIA Linux+ certification exam, also known as the XK0-005 exam, is a vendor-neutral certification test designed to validate the skills and knowledge of IT professionals working with Linux operating systems. XK0-005 exam is ideal for individuals who want to demonstrate their expertise in Linux system administration, installation, configuration, and troubleshooting.
Earning the CompTIA Linux+ certification demonstrates that an individual has the skills and knowledge required to work with Linux-based systems. It is a valuable certification for IT professionals as it validates their expertise and can help them advance their careers. CompTIA Linux+ Certification Exam certification is also recognized by major technology companies such as IBM, HP, and Dell, making it a highly sought-after credential in the IT industry.
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