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A systems administrator has set up third-party log aggregation agents across several cloud instances. The systems administrator wants to create a dashboard of failed SSH attempts and the usernames used. Which of the following files should be watched by the agents?

A. /var/log/audit/audit.log

B. /var/log/kern.log

C. /var/log/monitor

D. /etc/rsyslog.conf

An administrator needs to ensure the JAVA_HOME variable is set correctly for all users that log in to the server. Which of the following files should be edited to set this variable?

A. /etc/profile

B. /etc/skel/.profile

C. /home/user/.profile

D. /etc/rc.local

A junior systems administrator has generated a PKI certificate for SSH sessions. The administrator would like to configure authentication without passwords to remote systems. Which of the following should the administrator perform?

A. Add the content of id_rsa.pub file to the remote system ~/.ssh/authorized_keys location.

B. Add the content of id_rsa file to the remote system ~/.ssh/authorized_keys location.

C. Add the content of id_rsa file to the remote system ~/.ssh/known_hosts location.

D. Add the content of id_rsa.pub file to the remote system ~/.ssh/known_hosts location.

A Linux user wants to give read-only permissions to a directory and its contents. Which of the following commands will allow the user to accomplish this task?

A. chmod -R 400 /new_directory/

B. chmod -R 600 /new_directory/

C. chmod 400 /new_directory/

D. chmod 600 /new_directory/

The following represents a partial listing of a user's .bashrc file:

HISTSIZE=800 HISTFILESIZE=1000 umask 2002 HISTCONTROL=ignoreboth

When the user opens a terminal, an error message appears:

Octal number out of range

Which of the following lines in the partial .bashrc should be modified to prevent the error from occurring?

A. HISTSIZE=800

B. HISTFILESIZE=1000

C. umask 2002

D. HISTCONTROL=ignoreboth