Yes, LDAP exists in both versions.

Softera offers the LDAP brower as lightweight version of the Softera LDAP Administrator, as a free download. the LDAP browser does not allow to modify the LDAP directories by the users.

slapd

The following are some online sources where one can find online information about LDAP; How LDAP works on Person highered site, How to write LDAP search filter on Atlassion documentation, and An introduction to LDAP on Idapman website.

To configure LDAP domain controller in Red Hat Enterprise Linux 4, import the users from the LDAP server with the use of the domain server. Then login using the LDAP and reduce the DNS LDAP priority on the settings.