Working even if missing some commands - VPNclient

Hi to all

a VPNclient works fine to an 877-SEC-K9 even if the following commands are not
present

aaa authentication login userauthen local
aaa authorization network groupauthor local
!
aaa session-id common

I thought they were essential for the VPNclient to connect.
Certainly I am wrong, but I don't know why and where.

TIA,
Alessandro
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