/etc/resolv.conf, /etc/hosts, Directory, DIT, X.500, /etc/nsswitch.conf, getent, LDAP, Active Directory, Distinguished Name (DN), attributes, LDIF, DN, RDN, DC, CN, OU, search, LDAP URL, base, filters, ldapsearch, ldapadd, ldappasswd, ldapmodify, ldapdelete