The presence of what file will temporarily prevent all users except root from logging into the
system? (Specify the full name of the file, including path.)

With X11 forwarding in ssh, what environment variable is automatically set in the remote host shell
that is not set when X11 forwarding is not enabled? (Specify only the environment variable without
any additional commands or values.)

What argument to the -type option of find will match files that are symbolic links? (Specify only the
argument and no other options or words.)

In an xinetd configuration file, which attribute specifies the network address that will be used to
provide the service?

Which keyword must be listed in the hosts option of the Name Service Switch configuration file in
order to make host lookups consult the /etc/hosts file?

Which port is the default server port for the HTTPS protocol? (Specify the port number using
digits.)

Which command, depending on its options, can display the open network connections, the routing
tables, as well as network interface statistics. (Specify ONLY the command without any path or
parameters.)

What is the lowest numbered unprivileged TCP port? (Specify the number in digits only.)

How many IP-addresses can be used for unique hosts inside the IPv4 subnet 192.168.2.128/28?
(Specify the number only without any additional information.)

Which parameter must be passed to ifconfig to activate a previously inactive network interface?
(Specify the parameter only without any command, path or additional options)