CompTIA XK0-005 Online Practice Questions and Exam Preparation

CompTIA XK0-005 Online Questions & Answers

• Question 131:

  A Linux administrator needs to set the permissions on a server. The administrator wants to have the files within the directory set to read-write permissions and the directory set to read-write-execute permissions. Which of the following commands should the administrator use?

  A. chmod 0022
  B. chown 0027
  C. setfacl 0007
  D. umask 0077
  C. setfacl 0007

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  Explanation

  setfacl (Set File Access Control Lists) is used to define more granular permissions for files and directories.

  chmod 0022 sets specific permissions on files but does not affect newly created files.

  chown 0027 is incorrect because chown is used to change file ownership, not permissions.

  umask 0077 restricts permissions too much, making files private rather than just read/write.

  CompTIA Linux+ Official Study Guide, Chapter on File Permissions and ACLs

• Question 132:

  A developer has been unable to remove a particular data folder that a team no longer uses. The developer escalated the issue to the systems administrator. The following output was received:

  

  Which of the following commands can be used to resolve this issue?

  A. chgrp -R 755 data/
  B. chmod -R 777 data/
  C. chattr -R -i data/
  D. chown -R data/
  C. chattr -R -i data/

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  Explanation

  The command that can be used to resolve the issue of being unable to remove a particular data folder is chattr -R -i data/. This command will use the chattr utility to change file attributes on a Linux file system. The -R option means that chattr will recursively change attributes of directories and their contents. The -i option means that chattr will remove (unset) the immutable attribute from files or directories. When a file or directory has the immutable attribute set, it cannot be modified, deleted, or renamed. The other options are not correct commands for resolving this issue. The chgrp -R 755 data/ command will change the group ownership of data/ and its contents recursively to 755, which is not a valid group name. The chgrp command is used to change group ownership of files or directories. The chmod -R 777 data/ command will change the file mode bits of data/ and its contents recursively to 777, which means that everyone can read, write, and execute them. However, this will not remove the immutable attribute, which prevents deletion or modification regardless of permissions. The chmod command is used to change file mode bits of files or directories. The chown -R data/ command is incomplete and will produce an error. The chown command is used to change the user and/or group ownership of files or directories, but it requires at least one argument besides the file name.

  References: CompTIA Linux+ (XK0005) Certification Study Guide, Chapter 7: Managing Disk Storage; chattr(1) - Linux manual page; chgrp(1) - Linux manual page; chmod(1) - Linux manual page; chown(1) - Linux manual page

• Question 133:

  An administrator added a new disk to expand the current storage. Which of the following commands should the administrator run first to add the new disk to the LVM?

  A. vgextend
  B. lvextend
  C. pvcreate
  D. pvresize
  C. pvcreate

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  Explanation

• Question 134:

  A Linux administrator is attempting to capture all network traffic coming to the server from the 10.0.6.5 IP address. Which of the following commands should the administrator run on the server to achieve the goal?

  A. tcpdump ip 10.0.6.5
  B. tcpdump net 10.0.6.5
  C. tcpdump host 10.0.6.5
  D. tcpdump addr 10.0.6.5
  C. tcpdump host 10.0.6.5

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  Explanation

• Question 135:

  A Linux administrator was asked to run a container with the httpd server inside. This container should be exposed at port 443 of a Linux host machine while it internally listens on port 8443. Which of the following commands will accomplish this task?

  A. podman run -d -p 443:8443 httpd
  B. podman run -d -p 8443:443 httpd
  C. podman run -d -e 443:8443 httpd
  D. podman exec -p 8443:443 httpd
  A. podman run -d -p 443:8443 httpd

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  Explanation

  The command that will accomplish the task of running a container with the httpd server inside and exposing it at port 443 of the Linux host machine while it internally listens on port 8443 is podman run -d -p 443:8443 httpd. This command uses the podman tool, which is a daemonless container engine that can run and manage containers on Linux systems. The -d option runs the container in detached mode, meaning that it runs in the background without blocking the terminal. The -p option maps a port on the host machine to a port inside the container, using the format host_port:container_port. In this case, port 443 on the host machine is mapped to port 8443 inside the container, allowing external access to the httpd server. The httpd argument specifies the name of the image to run as a container, which in this case is an image that contains the Apache HTTP Server software. The other options are not correct commands for accomplishing the task. Podman run -d -p 8443:443 httpd maps port 8443 on the host machine to port 443 inside the container, which does not match the requirement. Podman run -d -e 443:8443 httpd uses the -e option instead of the -p option, which sets an environment variable inside the container instead of mapping a port. Podman exec -p 8443:443 httpd uses the podman exec command instead of the podman run command, which executes a command inside an existing container instead of creating a new one.

  References: CompTIA Linux+ (XK0-005) Certification Study Guide, Chapter 18: Automating Tasks

• Question 136:

  A new database is installed on a server. To comply with the database vendor requirement, the huge page function should be set permanently. Which of the following commands will set this parameter?

  A. sysctl -a "vm.nr_hugepage=100"
  B. echo "vm.nr_hiigepage=100" >> /etc/sysconfig/hugepage.conf
  C. echo "nvm.nr_hugepage=100" >> /etc/modprobe.conf
  D. echo "vm.nr_hugepage=100" >> /etc/sysctl.conf
  D. echo "vm.nr_hugepage=100" >> /etc/sysctl.conf

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  Explanation

• Question 137:

  A junior systems administrator recently installed an HBA card in one of the servers that is deployed for a production environment. Which of the following commands can the administrator use to confirm on which server the card was installed?

  A. lspci | egrep 'hba| fibr'
  B. lspci | zgrep 'hba | fibr'
  C. lspci | pgrep 'hba| fibr'
  D. lspci | 'hba | fibr'
  A. lspci | egrep 'hba| fibr'

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  Explanation

  The best command to use to confirm on which server the HBA card was installed is A. lspci | egrep `hba| fibr'. This command will list all the PCI devices on the server and filter the output for those that match the pattern `hba' or `fibr', which are likely to be related to the HBA card. The egrep command is a variant of grep that supports extended regular expressions, which allow the use of the `|' operator for alternation. The other commands are either invalid or will not produce the desired output. For example:

  B. lspci | zgrep `hba | fibr' will try to use zgrep, which is a command for searching compressed files, not standard output.

  C. lspci | pgrep `hba| fibr' will try to use pgrep, which is a command for finding processes by name or other attributes, not text patterns.

  D. lspci | `hba | fibr' will try to use `hba | fibr' as a command, which is not valid and will cause an error.

• Question 138:

  A Linux administrator needs to remove all local firewall rules on a Linux system. Which of the following commands should the administrator run?

  A. iptables -D
  B. iptables -L
  C. iptables -F
  D. iptables -A
  C. iptables -F

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  Explanation

  The iptables -F command flushes all the firewall rules, effectively removing them from the system. This command clears out all existing rules from all chains (INPUT, OUTPUT, and FORWARD), leaving the system with no active iptables rules.

• Question 139:

  Before a Linux administrator restarts a system using systemd, the administrator wants to know if any of the server users are currently logged in. Which of the following commands should the administrator use to verify that the server is not being used?

  A. loginctl list-sessions
  B. journalctl -u
  C. systemctl status user-sessions
  D. systemd --user
  A. loginctl list-sessions

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  Explanation

• Question 140:

  A Linux administrator deployed a large-scale application service as a containerized pod. The Linux administrator needs to continually send the application's log file to the company's central log store. Which of the following should the Linux administrator do to efficiently perform this task?

  A. Configure a sidecar to perform log shipping
  B. Run docker exec to access the logs within the container
  C. Execute docker inspect and run a log rsync replication
  D. Set up a custom task scheduler via kubectl
  A. Configure a sidecar to perform log shipping

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  Explanation

  In Kubernetes, a sidecar container can be added to the same pod as the main application. The sidecar handles tasks like log shipping, monitoring, or updating without interrupting the primary application. This is an efficient and widely-used pattern for managing application logs in containerized environments.