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A Linux administrator is tasked with creating resources using containerization. When deciding how to create this type of deployment, the administrator identifies some key features, including portability, high availability, and scalability in production. Which of the following should the Linux administrator choose for the new design?

A.

Docker

B.

On-premises systems

C.

Cloud-based systems

D.

Kubernetes

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?

A.

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

B.

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

C.

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

D.

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

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

Given the following output:

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

A.

restorecon -rv .ssh/authorized_key

B.

mv .ssh/authorized_key .ssh/authorized_keys

C.

systemct1 restart sshd.service

D.

chmod 600 mv .ssh/authorized_key

A developer is trying to install an application remotely that requires a graphical interface for installation. The developer requested assistance to set up the necessary environment variables along with X11 forwarding in SSH. Which of the following environment variables must be set in remote shell in order to launch the graphical interface?

A.

$RHOST

B.

SETENV

C.

$SHELL

D.

$DISPLAY

A systems administrator needs to reconfigure a Linux server to allow persistent IPv4 packet forwarding. Which of the following commands is the correct way to accomplish this task?

A.

echo 1 > /proc/sys/net/ipv4/ipv_forward

B.

sysctl -w net.ipv4.ip_forward=1

C.

firewall-cmd --enable ipv4_forwarding

D.

systemct1 start ipv4_forwarding

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?

A.

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

B.

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

C.

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

D.

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

A Linux engineer has been notified about the possible deletion of logs from the file /opt/app/logs. The engineer needs to ensure the log file can only be written into without removing previous entries.

Which of the following commands would be BEST to use to accomplish this task?

A.

chattr +a /opt/app/logs

B.

chattr +d /opt/app/logs

C.

chattr +i /opt/app/logs

D.

chattr +c /opt/app/logs

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

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.

A junior systems administrator has just generated public and private authentication keys for passwordless login. Which of the following files will be moved to the remote servers?

A.

id_dsa.pem

B.

id_rsa

C.

id_ecdsa

D.

id_rsa.pub

A Linux administrator is trying to remove the ACL from the file /home/user/data. txt but receives the following error message:

Given the following analysis:

Which of the following is causing the error message?

A.

The administrator is not using a highly privileged account.

B.

The filesystem is mounted with the wrong options.

C.

SELinux file context is denying the ACL changes.

D.

File attributes are preventing file modification.