CompTIA XK0-005 Online Practice Questions and Exam Preparation

CompTIA XK0-005 Online Questions & Answers

• Question 471:

  A systems administrator is compiling a report containing information about processes that are listening on the network ports of a Linux server. Which of the following commands will allow the administrator to obtain the needed information?

  A. ss -pint
  B. tcpdump -nL
  C. netstat -pn
  D. lsof -It
  A. ss -pint

  ---

  Explanation

  The command ss -pint will allow the administrator to obtain the needed information about processes that are listening on the network ports of a Linux server. The ss command is a tool for displaying socket statistics on Linux systems. Sockets are endpoints of network communication that allow processes to exchange data over the network. The ss command can show various information about the sockets, such as the state, address, port, protocol, and process. The -pint option specifies the filters and flags that the ss command should apply. The -p option shows the process name and ID that owns the socket. The -i option shows the internal information about the socket, such as the send and receive queue, the congestion window, and the retransmission timeout. The - n option shows the numerical address and port, instead of resolving the hostnames and service names. The -t option shows only the TCP sockets, which are the most common type of sockets used for network communication. The command ss -pint will display the socket statistics for the TCP sockets, along with the process name and ID, the numerical address and port, and the internal information. This will allow the administrator to obtain the needed information about processes that are listening on the network ports of a Linux server. This is the correct command to use to obtain the needed information. The other options are incorrect because they either do not show the socket statistics (tcpdump - nL or lsof -It) or do not show the process name and ID (netstat -pn).

  References: CompTIA Linux+ (XK0-005) Certification Study Guide, Chapter 12: Managing Network Connections, page 389.

• Question 472:

  A technician just fixed a few issues in some code and is ready to deploy the code into production. Which of the following steps should the technician take next?

  A. Create a new branch using git checkout.
  B. Perform a git clone to pull main down.
  C. Create a git pull request to merge into main.
  D. Perform a git pull to update the local copy of the code.
  C. Create a git pull request to merge into main.

  ---

  Explanation

  After fixing issues in the code, the next step is to merge these changes into the main branch. This is typically done by creating a pull request78.

  References:7(https://zeet.co/blog/deploy-toproduction)8(https://stackoverflow.com/questions/11833511/git-deploy-to-production)

• Question 473:

  A Linux administrator is adding a new configuration file to a Git repository. Which of the following describes the correct order of Git commands to accomplish the task successfully?

  A. pull -> push -> add -> checkout
  B. pull -> add -> commit -> push
  C. checkout -> push -> add -> pull
  D. pull -> add -> push -> commit
  B. pull -> add -> commit -> push

  ---

  Explanation

  The correct order of Git commands to add a new configuration file to a Git repository is pull -> add -> commit -> push. The pull command will fetch and merge the changes from the remote repository to the local repository, ensuring that the local repository is up to date. The add command will stage the new configuration file for the next commit, marking it as a new file to be tracked by Git. The commit command will create a new snapshot of the project state with the new configuration file and a descriptive message. The push command will publish the commit to the remote repository, updating the remote branch with the new configuration file. The pull -> push -> add -> checkout order is incorrect, as it will not create a commit for the new configuration file, and it will switch to a different branch without pushing the changes. The checkout -> push -> add -> pull order is incorrect, as it will switch to a different branch before adding the new configuration file, and it will overwrite the local changes with the remote changes without creating a commit. The pull -> add -> push -> commit order is incorrect, as it will not create a commit before pushing the changes, and it will create a commit that is not synchronized with the remote branch.

  References: CompTIA Linux+ (XK0-005) Certification Study Guide, Chapter 20: Writing and Executing Bash Shell Scripts, page 579.

• Question 474:

  Due to performance issues on a server, a Linux administrator needs to termi-nate an unresponsive process. Which of the following commands should the administrator use to terminate the process immediately without waiting for a graceful shutdown?

  A. kill -SIGKILL 5545
  B. kill -SIGTERM 5545
  C. kill -SIGHUP 5545
  D. kill -SIGINT 5545
  A. kill -SIGKILL 5545

  ---

  Explanation

  To terminate an unresponsive process immediately without waiting for a graceful shutdown, the administrator can use the command kill -SIGKILL 5545 (A). This will send a signal to the process with the PID 5545 that cannot be ignored or handled by the process, and force it to stop. The other commands will send different signals that may allow the process to perform some cleanup or termination actions, or may be ignored by the process.

  References:

  [CompTIA Linux+ Study Guide], Chapter 6: Managing Processes, Section: Killing Processes

  [How to Kill Processes in Linux]

• Question 475:

  A systems administrator is tasked with changing the default shell of a system account in order to disable iterative logins. Which of the following is the best option for the administrator to use as the new shell?

  A. /sbin/nologin
  B. /bin/ sh
  C. /sbin/ setenforce
  D. /bin/bash
  A. /sbin/nologin

  ---

  Explanation

  The /sbin/nologin shell is a special shell that prevents the user from logging into an interactive session. It is commonly used for system accounts that are not meant to be accessed by users, such as daemon or service accounts. When a user tries to log in with this shell, they will see a message like "This account is currently not available" and the login will fail.

  References:

  The /sbin/nologin shell is listed as one of the valid shells in the /etc/shells file1. The CompTIA Linux+ Certification Exam Objectives mention that the candidate should be able to "configure and manage system accounts and groups, including password aging and restricted shells" as part of the Hardware and System Configuration domain2. The usermod command can be used to change the user's login shell with the -s or --shell option3. For example, to change the shell of a user named daemon to /sbin/nologin, the command would be: sudo usermod -s /sbin/nologin daemon

• Question 476:

  A Linux systems administrator needs to copy files and directories from Server A to Server B.

  Which of the following commands can be used for this purpose? (Select TWO)

  A. rsyslog
  B. cp
  C. rsync
  D. reposync
  E. scp
  F. ssh
  C. rsync
  E. scp

  ---

  Explanation

  The rsync and scp commands can be used to copy files and directories from Server A to Server B. Both commands can use SSH as a secure protocol to transfer data over the network. The rsync command can synchronize files and directories between two locations, using various options to control the copying behavior. The scp command can copy files and directories between two hosts, using similar syntax as cp. The rsyslog command is used to manage system logging, not file copying. The cp command is used to copy files and directories within a single host, not between two hosts. The reposync command is used to synchronize a remote yum repository to a local directory, not copy files and directories between two hosts.

  References: CompTIA Linux+ (XK0-005) Certification Study Guide, Chapter 13: Networking Fundamentals, pages 440-441.