Explanation
he first figure is the output of the "show control connections" command. From this figure we learned that the
192.168.100.82 so we need to connect to this IP address (not 192.168.100.80).

The correct configuration for the scenario described is to use TACACS for authentication, and if TACACS is unavailable, allow login without any credentials. This is achieved by the command aaa authentication login default group tacacs+ none, which specifies TACACS as the primary authentication method and none as the secondary method, meaning no authentication is required if TACACS is not available.
References: The information is based on the Implementing and Operating Cisco Service Provider Network Core Technologies (SPCOR) training

Explanation
Output power is measured in mW (milliwatts). answer 'dBi' milliwatt is equal to one thousandth (103) of a watt.