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FromNumber of exam questionsExam nameExam code
Lead4Pass13CompTIA Linux+ CertificationXK0-005

A cloud engineer needs to change the secure remote login port from 22 to 49000. Which of the following files should the engineer modify to change the port number to the desired value?

A. /etc/host.conf

B. /etc/hostname

C. /etc/services

D. /etc/ssh/sshd_config

Correct Answer: D


An administrator deployed a Linux server that is running a web application on port 6379/tcp.
SELinux is in enforcing mode based on organization policies.

The port is open on the firewall.

Users who are trying to connect to a local instance of the web application receive Error 13, Permission denied.

The administrator ran some commands that resulted in the following output:

Latest 2v0-51.21 dumps exam practice questions 2

Which of the following commands should be used to resolve the issue?

A. semanage port -d -t http_port_t -p tcp 6379

B. semanage port -a -t http_port_t -p tcp 6379

C. semanage port -a http_port_t -p top 6379

D. semanage port -l -t http_port_tcp 6379

Correct Answer: B


A systems administrator is checking the system logs. The administrator wants to look at the last 20 lines of a log. Which of the following will execute the command?

A. tail -v 20

B. tail -n 20

C. tail -c 20

D. tail -l 20

Correct Answer: B


In order to copy data from another VLAN, a systems administrator wants to temporarily assign IP address 10.0.6 5/24 to the newly added network interface enp1s0f1.

Which of the following commands should the administrator run to achieve the goal?

A. ip addr add dev enpls0f1

B. echo “IPV4_ADDRESS=” > /etc/sysconfig/network-scripts/ifcfg-enplsOfl

C. ifconfig enpsIs0f1

D. nmcli conn add lpv4.address- ifname enpls0f1

Correct Answer: A


A systems administrator is investigating why one of the servers has stopped connecting to the internet.

Latest 2v0-51.21 dumps exam practice questions 5

Which of the following is causing the issue?

A. The DNS address has been commented out in the configuration file.

B. The search entry in the /etc/resolv.conf file is incorrect.

C. Wired connection 1 is offline.

D. No default route is defined.

Correct Answer: A


A user-generated pair of private-public keys on a workstation. Which of the following commands will allow the user to upload the public key to a remote server and enable passwordless login?

A. scp ~/.ssh/id_rsa user@server:~/

B. rsync ~ /.ssh/ user@server:~/

C. ssh-add user server

D. ssh-copy-id user@server

Correct Answer: D


A cloud engineer is asked to copy the file deployment.yaml from a container to the host where the container is running.

Which of the following commands can accomplish this task?

A. docker cp container_id/deployment.yaml deployment.yaml

B. docker cp container_id:/deployment.yaml deployment.yaml

C. docker cp deployment.yaml local://deployment.yaml

D. docker cp container_id/deployment.yaml local://deployment.yaml

Correct Answer: A


User1 is a member of the accounting group. Members of this group need to be able to execute but not make changes to a script maintained by User2. The script should not be accessible to other users or groups.

Which of the following will give proper access to the script?

A. chown user2:accounting chmod 750

B. chown user1:accounting chmod 777

C. chown accounting:user1 chmod 057

D. chown user2:accounting chmod u+x

Correct Answer: C


Which of the following technologies can be used as a central repository of Linux users and groups?





Correct Answer: A


The security team has identified a web service that is running with elevated privileges A Linux administrator is working to change the systemd service file to meet security compliance standards. Given the following output:

Latest 2v0-51.21 dumps exam practice questions 10

Which of the following remediation steps will prevent the web service from running as a privileged user?

A. Removing the ExecStarWusr/sbin/webserver -D OPTIONS from the service file

B. Updating the Environment File line in the [Service] section to/home/webservice/config

C. Adding the User-web service to the [Service] section of the service file

D. Changing the: multi-user. target in the [Install] section to

Correct Answer: A


A development team asks an engineer to guarantee the persistence of journal log files across system reboots. Which of the following commands would accomplish this task?

A. grep -i auto /etc/systemd/journald.conf and systemctl restart systemd-journald.service

B. cat /etc/systemd/journald.conf | awk \'(print $1,$3)\’

C. sed -I \’s/auto/persistent/g\’ /etc/systemd/journald.conf and sed -I \’persistent/s/^#//q\’

D. journalctl –list-boots and systemctl restart systemd-journald.service

Correct Answer: A


A Linux system fails to start and delivers the following error message:

Latest 2v0-51.21 dumps exam practice questions 12

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

A. fsck.ext4 /dev/sda1

B. partprobe /dev/sda1

C. fdisk /dev/sda1

D. mkfs.ext4 /dev/sda1

Correct Answer: A


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 on the server, but the administrator is still asked to provide a password during the connection.

Given the following output:

Latest 2v0-51.21 dumps exam practice questions 13

Which of the following commands would resolve the issue and allow an SSH connection to be established without a password?

A. restore -rv .ssh/authorized_key

B. mv .ssh/authorized_key .ssh/authorized_keys

C. systemctl restart sshd.service

D. chmod 600 mv .ssh/authorized_key

Correct Answer: C

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