LDAP or Lightweight Directory Access Protocol
What is the LDAP?
The Lightweight Directory Access Protocol (LDAP) protocol is a distributed, hierarchical directory service protocol that you use to gain access to repositories of users and other network objects. Because LDAP is not typically tightly integrated with the host operating system, information can be kept in both LDAP and in a name service such as Network Information Service. When you use LDAP to gain access to the groups, you reduce redundancy and maximize LDAP's scalability.
LDAP gives you the option of using paged or non-paged results when performing a search. With non-paged results, the maximum number of objects returned is limited by the MaxPageSize constraint on the domain server. With paged results, there is no maximum. You can return all the results. You set the LDAP client page size in the Search Options dialog box. This value cannot exceed the MaxPageSize constraint imposed by the domain server.