CompTIA CompTIA Certifications XK0-005 Questions & Answers

• Question 281:

  A Linux engineer is setting the sticky bit on a directory called devops with 755 file permission. Which of the following commands will accomplish this task?

  A. chown -s 755 devops

  B. chown 1755 devops

  C. chmod -s 755 devops

  D. chmod 1755 devops

  Correct Answer: D

  Explanation: The command that will set the sticky bit on a directory called devops with 755 file permission is chmod 1755 devops. This command will use chmod to change the mode of the directory devops to 1755, which means that the owner has read, write, and execute permissions (7), the group has read and execute permissions (5), and others have read and execute permissions (5). The first digit 1 indicates that the sticky bit is set on the directory, which is a special permission that prevents users from deleting or renaming files in the directory that they do not own. The other options are not correct commands for setting the sticky bit on a directory. The chown -s 755 devops command is invalid because chown is used to change the owner and group of files or directories, not their permissions. The -s option for chown is used to remove a symbolic link, not to set the sticky bit. The chown 1755 devops command is also invalid because chown does not accept numeric arguments for changing permissions. The chmod -s 755 devops command will remove the sticky bit from the directory devops, not set it. References: chmod(1) - Linux manual page; How to Use SUID, SGID, and Sticky Bits on Linux

• Question 282:

  A systems administrator is investigating a service that is not starting up. Given the following information:

  

  Which of the following systemd commands should the administrator use in order to obtain more details about the failing service?

  A. systemct1 analyze network

  B. systemct1 info network

  C. sysctl -a network

  D. journalctl -xu network

  Correct Answer: D

  The systemd is a system and service manager for Linux systems that provides a standard way to control and monitor system services. The systemd uses various commands and tools to manage and troubleshoot system services, such as

  systemct1, sysctl, and journalctl. The systemct1 command is used to start, stop, enable, disable, restart, reload, status, and list system services. The sysctl command is used to configure kernel parameters at runtime. The journalctl command

  is used to view and filter the logs of system services.

  To investigate a service that is not starting up, the administrator can use the journalctl command with the -xu option. The -x option enables verbose output that includes explanatory text and priority information. The -u option filters the output by

  a specific unit name, such as network.service. Therefore, the command journalctl -xu network will show detailed logs of the network service, which can help identify the cause of the failure. The statement D is correct.

  The statements A, B, and C are incorrect because they do not provide more details about the failing service. The systemct1 analyze network command does not exist. The systemct1 info network command shows basic information about the

  network unit, such as description, load state, active state, sub state, and main PID. The sysctl -a network command shows all kernel parameters related to network settings. References:

  [How to Use Systemd to Manage System Services]

• Question 283:

  A Linux administrator has installed a web server, a database server, and a web application on a server. The web application should be active in order to render the web pages. After the administrator restarts the server, the website displays the following message in the browser: Error establishing a database connection. The Linux administrator reviews the following relevant output from the systemd init files:

  

  The administrator needs to ensure that the database is available before the web application is started. Which of the following should the administrator add to the HTTP server .service file to accomplish this task?

  A. TRIGGERS=mariadb.service

  B. ONFAILURE=mariadb.service

  C. WANTEDBY=mariadb.service

  D. REQUIRES=mariadb.service

  Correct Answer: D

  Explanation: The administrator should add REQUIRES=mariadb.service to the HTTP server .service file to ensure that the database is available before the web application is started. This directive specifies that the HTTP server unit requires the MariaDB server unit to be started before it can run. If the MariaDB server unit fails to start or stops for any reason, the HTTP server unit will also fail or stop. This way, the dependency between the web application and the database is enforced by systemd. The other options are not correct directives for accomplishing this task. TRIGGERS=mariadb.service is not a valid directive in systemd unit files. ONFAILURE=mariadb.service means that the HTTP server unit will start only if the MariaDB server unit fails, which is not what we want. WANTEDBY=mariadb.service means that the HTTP server unit will be started when the MariaDB server unit is enabled, but it does not imply a strong dependency or ordering relationship between them. References: CompTIA Linux+ (XK0-005) Certification Study Guide, Chapter 10: Managing Services with systemd; systemd.unit(5) - Linux manual page

• Question 284:

  DRAG DROP

  You have been asked to parse a log file of logins to determine various information about who is logging in and when.

  INSTRUCTIONS

  Open and inspect the Login log file.

  Drag and drop the correct commands onto the output that was generated from that

  command.

  Tokens can be used only once and not all will be used.

  If at any time you would like to bring back the initial state of the simulation, please click the Reset All button.

  Select and Place:

  

  Correct Answer:

  

• Question 285:

  HotsPot

  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 /.

  Hot Area:

  

  Correct Answer: