The authentication protocol used for this switch module.
When set to a chap(1), the authentication scheme used will
be the 'PPP Challenge Handshake Authentication Protocol
(CHAP)', when set to a pap(2), the scheme will be
'Password Authentication Protocol (PAP)'.
When using the CHAP protocol, the username and password
utilize the CHAP protocol method of encryption to encrypt
the users password in the http transmission of the submitted
form on the segment between the end-station and the
switch port.
The PAP protocol is less secure than CHAP and does not
provide any encryption on the segment between the
end-station the switch port. The username and password
go over this segment in the http transmission of the
submitted form in plain text format.