tailieunhanh - Networking: A Beginner’s Guide Fifth Edition- P28

Networking: A Beginner’s Guide Fifth Edition- P28:I have run into many people over the years who have gained good even impressive working knowledge of PCs, operating systems, applications, and common problems and solutions. Many of these people are wizards with desktop computers. | Chapter 9 Exploring Directory Services 117 Trees are then aggregated into a larger forest structure. According to Microsoft Active Directory can handle millions of objects through this approach. Active Directory does not require the management of trust relationships except when connected to Windows NT servers that are not using Active Directory. Otherwise all domains within a tree have automatic trust relationships. The standard was developed jointly by the International Telecommunications Union ITU and the International Standards Organization ISO . The standard defines a directory service that can be used for the entire Internet. Because of its broad applicability the specification is too complex for most organizations to implement. Also because of its design it is intended to publish specific organizational directory entries across the Internet which is something most companies would not want to do. Just the same the standard is extremely important and most directory services mimic or incorporate parts of it in some fashion. The directory tree starts with a root just like the other directory trees and then breaks down into country C organization O organizational unit OU and common name CN fields. To specify an address fully you provide five fields as in the following CN user name OU department OU division O organization C country For example you might configure the fields as follows CN Bruce Hallberg OU Networking Books OU Computer Books O McGraw-Hill C USA LDAP To address the complexity problems involved with full DAP a consortium of companies came up with a subset of called LDAP. LDAP s advocates claim that it provides 90 percent of the power of but at only 10 percent of the processing cost. LDAP runs over TCP IP and uses a client server model. Its organization is much the same as that of but with fewer fields and fewer functions. LDAP is covered predominantly by RFC 1777 for version 2 and RFC 2251

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