Sorry for asking this noob question. 
After putting my root password at startup and doing some sudo command at dom0 It does not prompt me any password. Why is it? or did I miss something?Can someone explaine Any help. Thanks
There is also passwordless user->root access in dom0. As stated in comment in sudo configuration there (different one than VMs one), there is really no point in user/root isolation, because all the user data (and VM management interface) is already accessible from dom0 user level, so there is nothing more to get from dom0 root account.
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