Which option is considered a TACACS+ configuration option in Cisco ISE?

The correct option regarding TACACS+ configuration in Cisco Identity Services Engine (ISE) is the TACACS+ version. This choice is fundamental in establishing how the TACACS+ protocol functions within an ISE environment. Different versions of TACACS+ may introduce distinct features or modifications in behavior, meaning that specifying the correct version is crucial for ensuring compatibility and functionality between Cisco ISE and the devices that will be communicating with it using TACACS+.

While management user names and shared secrets are indeed part of the TACACS+ configuration, they are specific parameters rather than overarching configuration options such as the version itself. The management user name is essential for authentication processes but does not influence the protocol's operational characteristics. Similarly, the shared secret is critical for securing the communication between the TACACS+ server and the client, but again, it does not dictate how the protocol itself operates, unlike the version number, which defines the underlying protocol mechanics.

The observation node, which refers to the ISE node that a client connects to for monitoring purposes, is not a TACACS+ configuration parameter at all. Therefore, focusing on the version highlights a key aspect of TACACS+ configuration that is essential for proper integration within the Cisco ISE framework.