A user generated a 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?

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

A systems administrator made some unapproved changes prior to leaving the company. The newly hired administrator has been tasked with revealing the system to a compliant state. Which of the following commands will list and remove the correspondent packages?

dnf history and dnf history undo last

An administrator transferred a key for SSH authentication to a home directory on a remote server.The key file was moved to .ssh/authorized_keys location in order to establish SSH connection without a password. However, the SSH command still asked for the password. Given the following output: Which of the following commands would resolve the issue?

restorecon .ssh/authorized_keys

ssh_keygen -t rsa -o .ssh/authorized_keys

chown root:root .ssh/authorized_keys

A Linux system is failing to boot with the following error: Which of the following actions will resolve this issue? (Choose two.)

Execute grub-install /dev/sdX and reboot.

Boot the system on a LiveCD/ISO.

Execute grub-install --root-directory=/mnt and reboot.

Execute grub-install /dev/sdX and reboot.

Interrupt the boot process in the GRUB menu and add rescue to the kernel line.

Fix the partition modifying /etc/default/grub and reboot.

Interrupt the boot process in the GRUB menu and add single to the kernel line.

Boot the system on a LiveCD/ISO.

A Linux administrator needs to create an image named sda.img from the sda disk and store it in the /tmp directory. Which of the following commands should be used to accomplish this task?

dd --if=/dev/sda --of=/tmp/sda.img

dd --of=/dev/sda --if=/tmp/sda.img

A systems administrator is investigating why one of the servers has stopped connecting to the internet. Which of the following is causing the issue?

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

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

A junior Linux administrator is tasked with installing an application. The installation guide states the application should only be installed in a run level 5 environment. Which of the following commands would ensure the server is set to runlevel 5?

systemctl isolate graphical.target

systemctl isolate multi-user.target

systemctl isolate graphical.target

systemctl isolate network.target

A Linux administrator is tasked with adding users to the system. However, the administrator wants to ensure the users' access will be disabled once the project is over. The expiration date should be 2021-09-30. Which of the following commands will accomplish this task?

sudo useradd -e 2021-09-30 Project_user

sudo useradd -c 2021-09-30 Project_user

sudo modinfo -F 2021-09-30 Project_uses

sudo useradd -m -d 2021-09-30 Project_user

A DevOps engineer needs to download a Git repository fromhttps://git.company.com/admin/project.git. Which of the following commands will achieve this goal?

git clone https://git.company.com/admin/project.git

git checkout https://git.company.com/admin/project.git

git pull https://git.company.com/admin/project.git

git branch https://git.company.com/admin/project.git

An administrator installed an application from source into /opt/operations1/ and has received numerous reports that users are not able to access the application without having to use the full path /opt/operations1/bin/*. Which of the following commands should be used to resolve this issue?

echo 'export PATH=$PATH:/opt/operations1/bin' >> /etc/profile

echo 'export PATH=/opt/operations1/bin' >> /etc/profile

echo 'export PATH=$PATH/opt/operations1/bin' >> /etc/profile

echo 'export $PATH:/opt/operations1/bin' >> /etc/profile

A Linux system is getting an error indicating the root filesystem is full. Which of the following commands should be used by the systems administrator to resolve this issue? (Choose three.)

growpart /dev/mapper/rootvg-rootlv

lvresize -L +10G -r /dev/mapper/rootvg-rootlv

growpart /dev/mapper/rootvg-rootlv

lvresize -L +10G -r /dev/mapper/rootvg-rootlv

parted -l /dev/mapper/rootvg-rootlv

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?

docker cp container_id:/deployment.yaml deployment.yaml

docker cp container_id/deployment.yaml deployment.yaml

docker cp container_id:/deployment.yaml deployment.yaml

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

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

A Linux system is failing to start due to issues with several critical system processes. Which of the following options can be used to boot the system into the single user mode? (Choose two.)

Interrupt the boot process in the GRUB menu and add systemd.unit=rescue.target in the kernel line.

Interrupt the boot process in the GRUB menu and add systemd.unit=single.target in the kernel line.

Execute the following command from the GRUB rescue shell: mount -o remount, ro/sysroot.

Interrupt the boot process in the GRUB menu and add systemd.unit=single in the kernel line.

Interrupt the boot process in the GRUB menu and add systemd.unit=rescue.target in the kernel line.

Interrupt the boot process in the GRUB menu and add single=user in the kernel line.

Interrupt the boot process in the GRUB menu and add init=/bin/bash in the kernel line.

Interrupt the boot process in the GRUB menu and add systemd.unit=single.target in the kernel line.

A DevOps engineer needs to allow incoming traffic to ports in the range of 4000 to 5000 on a Linux server. Which of the following commands will enforce this rule?

iptables -t filter -A INPUT -p tcp --dport 4000:5000 -j ACCEPT

iptables -f filter -I INPUT -p tcp --dport 4000:5000 -A ACCEPT

iptables -t filter -A INPUT -p tcp --dport 4000:5000 -j ACCEPT

iptables filter -A INPUT -p tcp --dport 4000:5000 -D ACCEPT

iptables filter -S INPUT -p tcp --dport 4000:5000 -A ACCEPT

A server is experiencing intermittent connection issues. Some connections to the Internet work as intended, but some fail as if there is no connectivity. The systems administrator inspects the server configuration: Which of the following is MOST likely the cause of the issue?

Two default routes are configured.

An internal-only DNS server is configured.

The IP netmask is wrong for ens3.

Two default routes are configured.

The ARP table contains incorrect entries.

A cloud engineer needs to block the IP address 192.168.10.50 from accessing a Linux server. Which of the following commands will achieve this goal?

iptables -A INPUT -s 192.168.10.30 -j DROP

iptables -F INPUT -j 192.168.10.50 -m DROP

iptables -A INPUT -s 192.168.10.30 -j DROP

iptables -i INPUT --ipv4 192.168.10.50 -z DROP

iptables -j INPUT 192.168.10.50 -p DROP

A Linux systems administrator is configuring a new filesystem that needs the capability to be mounted persistently across reboots. Which of the following commands will accomplish this task?(Choose two.)

echo "/dev/sdc1 /data ext4 defaults 0 0" >> /etc/fstab

echo "/data /dev/sdc1 ext4 defaults 0 0" >> /etc/fstab

echo "/dev/sdc1 /data ext4 defaults 0 0" >> /etc/fstab

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

sed -i 's/auto/persistent/g' /etc/systemd/journald.conf && sed -i 'persistent/s/ˆ#//q' /etc/systemd/journald.conf

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

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

sed -i 's/auto/persistent/g' /etc/systemd/journald.conf && sed -i 'persistent/s/ˆ#//q' /etc/systemd/journald.conf

journalctl --list-boots && systemctl restart systemd-journald.service

A systems administrator is receiving tickets from users who cannot reach the application app that should be listening on port 9443/tcp on a Linux server.To troubleshoot the issue, the systems administrator runs netstat and receives the following output: Based on the information above, which of the following is causing the issue?

The application is listening on the loopback interface.

The IP address 0.0.0.0 is not valid.

The application is listening on the loopback interface.

The application is listening on port 1234.

The application is not running.

A systems administrator is troubleshooting a connectivity issue pertaining to access to a system named db.example.com. The system IP address should be 192.168.20.88. The administrator issues the dig command and receives the following output: The administrator runs grep db.example.com /etc/hosts and receives the following output: Given this scenario, which of the following should the administrator do to address this issue?

Modify the /etc/hosts file and change the db.example.com entry to 192.168.20.88.

Modify the /etc/hosts file and change the db.example.com entry to 192.168.20.89.

Modify the /etc/network file and change the db.example.com entry to 192.168.20.88.

Modify the /etc/network file and change the db.example.com entry to 192.168.20.89.

Modify the /etc/hosts file and change the db.example.com entry to 192.168.20.88.

Users have been unable to reach www.comptia.org from a Linux server. A systems administrator is troubleshooting the issue and does the following: Based on the information above, which of the following is causing the issue?

The server 192.168.168.53 is unreachable.

The name www.comptia.org does not point to a valid IP address.

The server 192.168.168.53 is unreachable.

No default route is set on the server.

The network interface eth0 is disconnected.

A Linux administrator was notified that a virtual server has an I/O bottleneck. The Linux administrator analyzes the following output: Given there is a single CPU in the sever, which of the following is causing the slowness?

The system is running out of swap space.

A Linux engineer needs to create a custom script, cleanup.sh, to run at boot as part of the system services. Which of the following processes would accomplish this task?

Create a unit file in the /etc/systemd/system/ directory.systemctl enable cleanupsystemctl is-enabled cleanup

Create a unit file in the /etc/default/ directory.systemctl enable cleanupsystemctl is-enabled cleanup

Create a unit file in the /etc/ske1/ directory.systemctl enable cleanupsystemctl is-enabled cleanup

Create a unit file in the /etc/systemd/system/ directory.systemctl enable cleanupsystemctl is-enabled cleanup

Create a unit file in the /etc/sysctl.d/ directory.systemctl enable cleanupsystemctl is-enabled cleanup

CompTIA XK0-005 Practice Test 3 - Free Online Exam Questions 81-120

A systems administrator wants to be sure the sudo rules just added to /etc/sudoers are valid. Which of the following commands can be used for this task?

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