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Con đường được đại diện bởi các chi phí nhỏ nhất trở thành các đường dẫn ưa thích để đạt đến đích. Thông tin này được duy trì trong một bảng vector khoảng cách. Bảng này là định kỳ quảng cáo cho mỗi lân cận | LDAP interface for the GDA One way LDAP is being integrated into DCE is to allow DCE cells to be registered in LDAP directories. The GDA in a cell that wants to connect to remote cells is configured to enable access to the LDAP directory see Figure 12-17 . Figure 12-17 The LDAP interface for GDA DCE originally only supported X.500 and DNS name syntax for cell names. LDAP and X.500 names both follow the same hierarchical naming model but their syntax is slightly different. X.500 names are written in reverse order and use a slash rather than a comma to separated relative distinguished names. When the GDA is configured to use LDAP it converts cell names in X.500 format into the LDAP format. LDAP interface for the CDS DCE provides two programming interfaces to the Directory Service Name Service Interface NSI and the X Open Directory Service XDS . XDS is an X.500-compatible interface used to access information in the GDS and it can also be used to access information in the CDS. However the use of NSI is much more common in DCE applications. The NSI API provides functionality that is specifically tailored for use with DCE client and server programs that use RPC. NSI allows servers to register their address and the type of RPC interface they support. This address interface information is called an RPC binding and is 476 TCP IP Tutorial and Technical Overview needed by clients that want to contact the server. NSI allows clients to search the CDS for RPC binding information. NSI was designed to be independent of the directory where the RPC bindings are stored. However the only supported directory to date has been CDS. NSI will be extended to also support adding and retrieving RPC bindings from an LDAP directory. This will allow servers to advertise their RPC binding information in either CDS or an LDAP directory. Application programs can use either the NSI or the LDAP API when an LDAP directory is used see Figure 12-18 . Figure 12-18 The LDAP interface for NSI 12.4.8 The .
