When a client wants to make use of a service, it must locate an instance of a server providing that service. This is called the client/server binding. In systems without a directory service, knowledge of the location of the service is hard-coded into the application, precluding dynamic changes of configuration. By means of a directory service, the location of the service can be dynamic, greatly facilitating system management for load balancing and maintenance.
Figure 9 Client/Server Binding