A.A good security practice is to have the none parameter configured as the final method used to ensure that no other authentication method will be used.
B.If a TACACS+ server is not available， then a user connecting via the console port would not be able to gain access since no other authentication method has been defined.
C.If a TACACS+ server is not available， then the user Bob could be able to enter privileged mode as long as the proper enable password is entered.
D.The aaa new-model command forces the router to override every other authentication method previously configured for the router lines.
E.To increase security， group radius should be used instead of group tacacs+.
F.Two authentication options are prescribed by the displayed aaa authentication command.

A.An HTTP SDF file location can be specified by clicking the Add button.
B.If all specified SDF locations fail to load， the signature file that is named default.sdf will be loaded.
C.The Autosave feature automatically saves the SDF alarms if the router crashes.
D.The Autosave feature is automatically enabled for the default built-in signature file.
E.The name of the built-in signature file is default.sdf.
F.The Use Built-In Signatures （as backup） check box is selected by default.