Final answer:
To configure a TACACS+ server as an authentication database, you need to configure the device's IP address, username and password, define the method list, and configure the TACACS+ server's IP address and key.
Step-by-step explanation:
The steps of configuring a device to use a TACACS+ server as an authentication database are as follows:
- Configure the device's IP address.
- Configure the username and password for authentication.
- Define the method list that specifies the order in which authentication methods will be used, including TACACS+
- Finally, configure the TACACS+ server's IP address and key, which is used for communication with the server.