CompTIA XK0-005 Online Practice Questions and Exam Preparation

CompTIA XK0-005 Online Questions & Answers

• Question 421:

  Which of the following options represents disk mirroring?

  A. RAID 0
  B. RAID 1
  C. RAID 5
  D. RAID 6
  B. RAID 1

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  Explanation

• Question 422:

  A junior administrator updated the PostgreSQL service unit file per the data-base administrator's recommendation. The service has been restarted, but changes have not been applied. Which of the following should the administrator run for the changes to take effect?

  A. Systemct1 get--default
  B. systemct1 daemon--reload
  C. systemct1 enable postgresq1
  D. systemct1 mask postgresq1
  B. systemct1 daemon--reload

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  Explanation

  To apply changes to a systemd service unit file, the administrator needs to reload the systemd daemon using the command systemct1 daemon-reload (B). This will make systemd aware of the new or changed unit files. The other commands will not reload the systemd daemon or apply the changes.

  References:

  [CompTIA Linux+ Study Guide], Chapter 7: Managing System Services, Section:

  Modifying Systemd Services

  [How to Reload Systemd Services]

• Question 423:

  SIMULATION

  A senior administrator has placed a private key for user admin in your home directory.

  The server you need to remotely access is server1 and SSH is listening on port 2222. INSTRUCTIONS

  Part 1

  Review the command output and build the correct command to place the private key into your SSH folder.

  Part 2

  Review the command output and build the correct command to set the file permissions.

  Part 3

  Review the command output and build the correct command to set the correct ownership.

  In each part, click on objects to build a complete command. Command objects may be used more than once, but not all will be used. Use _ as the spacebar. Click the arrow to remove any unwanted objects from your command.

  Part 4

  Select the proper file to edit for remote server access. Then, build the correct configuration output based on the server name, ports, and files.

  

  

  

  A. See the Explanation part for detailed answer of each part.
  B. PlaceHolder
  C. PlaceHolder
  D. PlaceHolder
  A. See the Explanation part for detailed answer of each part.

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  Explanation

  Part 1

  Here is the step-by-step command construction process:

  1. Move the private key (likely named server1 based on the provided details) to the .ssh directory:

  mv ~/server1 ~/.ssh/id_rsa

  This command moves the private key (assuming it's named server1) from the home directory (~) to the .ssh directory and renames it to id_rsa (which is the default SSH private key file name).

  2. Set the correct permissions for the private key file:

  chmod 600 ~/.ssh/id_rsa

  The private key file should be readable and writable only by the owner to maintain security.

  3. Connect to the server using the private key and the correct port (2222):

  ssh -i ~/.ssh/id_rsa -p 2222 admin@server1

  This command tells ssh to use the specified private key (-i ~/.ssh/id_rsa), connect on port 2222 (-p 2222), and log in as the admin user on server1.

  Part 2: Setting File Permissions

  The correct command to set the file permissions based on the screenshots would likely involve using chmod. Here is the command to set permissions correctly:

  chmod 600 ~/.ssh/id_rsa

  This restricts the private key's permissions so that only the user can read and write it.

  Part 3: Setting Ownership

  If ownership needs to be set, the command would look like this:

  chown comptia:comptia ~/.ssh/id_rsa

  This command ensures that the file is owned by the correct user (comptia) and the correct group (comptia).

  In part 4, it asks you to select the proper file for editing to enable remote server access. Based on standard SSH configuration requirements, the proper file to edit for remote server access would be ~/.ssh/config.

  Here's why:

  ~/.ssh/config: This file allows you to set up configuration options for different hosts, including specifying ports, user names, and the identity file (private key). You would add the necessary configuration for server1 to this file for easier access.

  Other options:

  For configuring access to server1 on port 2222, you would add a block like this to the ~/.ssh/config file:

  Host server1

  HostName server1

  Port 2222

  User admin

  IdentityFile ~/.ssh/id_rsa

• Question 424:

  An application developer received a file with the following content:

  ##This is a sample Image ##

  FROM ubuntu:18.04

  MAINTAINER [email protected]

  COPY . /app

  RUN make /app CMD python /app/app.py

  RUN apt-get update

  RUN apt-get install -y nginx

  CMD ["echo","Image created"]

  The developer must use this information to create a test bed environment and identify the image (myimage) as the first version for testing a new application before moving it to production. Which of the following commands will accomplish this task?

  A. docker build -t myimage:1.0 .
  B. docker build -t myimage: .
  C. docker build -t myimage-1.0 .
  D. docker build -i myimage:1.0 .
  A. docker build -t myimage:1.0 .

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  Explanation

  The docker build command is used to build an image from a Dockerfile and a context1. The Dockerfile is a text file that contains the instructions for creating the image, and the context is a set of files that can be used in the image creation process1. The file that the developer received is an example of a Dockerfile.

  The -t option is used to specify a name and an optional tag for the image1. The name and tag are separated by a colon (:), and the tag is usually used to indicate the version of the image2. For example, -t myimage:1.0 means that the image will be named myimage and tagged as 1.0.

  The last argument of the docker build command is the path to the context, which can be a local directory or a URL1. The dot (.) means that the current working directory is the context2. Therefore, docker build -t myimage:1.0 . means that the image will be built from the Dockerfile and the files in the current working directory, and it will be named myimage and tagged as 1.0.

• Question 425:

  Which of the following command sequences is used to install Linux software directly from source code?

  A. ./config ./compile ./copy
  B. unzip gcc install
  C. ./unpack make exec make copy
  D. ./configure make make install
  D. ./configure make make install

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  Explanation

• Question 426:

  A Linux administrator intends to start using KVM on a Linux server. Which of the following commands will allow the administrator to load the KVM module as well as any related dependencies?

  A. modprobe kvm
  B. insmod kvm
  C. depmod kvm
  D. hotplug kvm
  A. modprobe kvm

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  Explanation

  This command will load the KVM module as well as any related dependencies, such as kvm-intel or kvm-amd, depending on the processor type. The modprobe command is a Linux utility that reads the /etc/modules.conf file and adds or removes modules from the kernel. It also resolves any dependencies between modules, so that they are loaded in the correct order.

  The other options are incorrect because:

  B. insmod kvm

  This command will only load the KVM module, but not any related dependencies. The insmod command is a low-level Linux utility that inserts a single module into the kernel. It does not resolve any dependencies between modules, so they have to be loaded manually.

  C. depmod kvm

  This command will not load the KVM module at all, but only create a list of module dependencies for modprobe to use. The depmod command is a Linux utility that scans the installed modules and generates a file called modules.dep that contains dependency information for each module.

  D. hotplug kvm

  This command is invalid and does not exist. The hotplug mechanism is a feature of the Linux kernel that allows devices to be added or removed while the system is running. It does not have anything to do with loading modules.

• Question 427:

  A cloud engineer needs to remove all dangling images and delete all the images that do not have an associated container. Which of the following commands will help to accomplish this task?

  A. docker images prune -a
  B. docker push images -a
  C. docker rmi -a images
  D. docker images rmi --all
  A. docker images prune -a

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  Explanation

  The command docker images prune -a will help to remove all dangling images and delete all the images that do not have an associated container. The docker command is a tool for managing Docker containers and images. The images subcommand operates on images. The prune option removes unused images. The -a option removes all images, not just dangling ones. A dangling image is an image that is not tagged and is not referenced by any container. This command will accomplish the task of cleaning up the unused images. The other options are incorrect because they either do not exist (docker push images -a or docker images rmi --all) or do not remove images (docker rmi -a images only removes images that match the name or ID of "images").

  References: CompTIA Linux+ (XK0-005) Certification Study Guide, Chapter 19: Managing Cloud and Virtualization Technologies, page 567.

• Question 428:

  An administrator is unable to sync servers to the new NTP server IP address given by the service provider despite several attempts. Looking at the below output

  

  Which of the following commands will help resolve the issue?

  D

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  Explanation

• Question 429:

  User1 reports "access denied" errors while trying to execute app. Given the following outputs:

  

  Which of the following options will remediate this issue?

  A. Providing execute permissions to user1 in the ACL
  B. Modifying the permissions for others to grant read, write, and execute
  C. Adding user1 to the wheel group
  D. Moving app to a different folder
  A. Providing execute permissions to user1 in the ACL

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  Explanation

• Question 430:

  A systems administrator needs to clone the partition /dev/sdc1 to /dev/sdd1. Which of the following commands will accomplish this task?

  A. tar -cvzf /dev/sdd1 /dev/sdc1
  B. rsync /dev/sdc1 /dev/sdd1
  C. dd if=/dev/sdc1 of=/dev/sdd1
  D. scp /dev/sdc1 /dev/sdd1
  C. dd if=/dev/sdc1 of=/dev/sdd1

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  Explanation

  The command dd if=/dev/sdc1 of=/dev/sdd1 copies the data from the input file (if) /dev/sdc1 to the output file (of) /dev/sdd1, byte by byte. This is the correct way to clone a partition. The other options are incorrect because they either compress the data (tar -cvzf), synchronize the files (rsync), or copy the files over a network (scp), which are not the same as cloning a partition.

  References: CompTIA Linux+ (XK0-005) Certification Study Guide, Chapter 10: Managing Storage, page 321.