Given AAA and a TACACS+ server-group configured on R1, which change fixes vty authentication to use the server group?
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Correct answer: line vty 0 4 login authentication telnet.
Why this is the answer
The command line vty 0 4 login authentication telnet is incorrect because telnet is not a valid authentication method; it's a protocol. The correct command to apply a named AAA authentication list to VTY lines is line vty 0 4 login authentication TAC-SERV. This command directs the VTY lines to use the authentication methods defined in the AAA list named TAC-SERV. The options tacacs-server host 192.168.1.5 key Cisco123 and ip tacacs-server host 192.168.1.5 key Cisco123 are used to define the TACACS+ server itself, not to apply it to VTY authentication.
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