What command, depending on its options, can display the open TCP connections, the routing tables, as well as network interface statistics? (Specify only the command without any path or parameters.)
Which of the following is a valid IPv6 address?
When using X11 forwarding in SSH, what environment variable is automatically set in the remote shell in order to help applications to connect to the correct X11 server? (Specify only the environment variable without any additional commands or values.)
Depending on a system’s configuration, which of the following files can be used to enable and disable network services running on this host?
Which option in the chrony configuration file changes the initial interval of polls to a NTP server in order to speed up the initial synchronization?
What output does the command seq 10 produce?
Which of the following entries in /etc/syslog.conf writes all mail related events to the file /var/log/maillog and sends all critical events to the remote server logger.example.com?
Which of the following statements is valid in the file /etc/nsswitch.conf?
Which command makes the shell variable named VARIABLE visible to subshells?