Respuesta :
The service is:
Terminal Access Control Access Control System (TACACS)
About TACACS:
An authentication protocol called Terminal Access Controller Access Control System (TACACS) is used for remote communication with any server located within a UNIX network. TACACS offers a simple way to communicate with remote authentication servers to determine user network access. By default, port 49 is used by the TACACS protocol.
TACACS employs authentication keys that correlate to usernames and passwords along with allow/deny methods. The TACACS protocol was created and introduced by Cisco, which is also its owner.
A user query from a remote server is accepted via the TACACS protocol, which has a relatively straightforward operating mechanism, and forwarded to the authentication server for any necessary action. A user query on behalf of the host may be approved or rejected by the authentication server. A platform or system running on the server is referred to as the host. The query result is delivered as a feedback answer to the query creator.
The routing node used in dialup connections during user login determines whether to grant or deny access to users based on the outcome of the query.
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