I was recently looking at the man page for sssd-ldap and saw that several of the options default to the 'openldap defaults'.

Based on this I was wondering:
1) Is there any requirement of SSSD on openldap client tools?
2) If openldap is NOT required will SSSD still use what would be the openldap values or is it required to have the ldap.conf file present to obtain these values?
3) If not #2 are there other defaults that SSSD uses or must we provide values when we don't have ldap.conf in place?