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In our example of fiber-optic and infrared media objects, not only do the two media types share common objects by inheritance, but they use their own to store data-specific information This data schema technique is called generalization In relational databases it has the positive effect of having to store a particular type of data only in a single place For DEN, generalization through inheritance also has the advantage of making it easier to link disparate directory formats within the data schema In essence, DEN works by setting up a hierarchy of classes that contain related objects The higher you are in the DEN information model, the more removed you are from the actual things (routers, servers, users) being stored in other words, things are more abstract at the higher levels The farther down the model you go, the closer you are to real objects But everything remains,

Once the idea of AAA took shape, those smart Internet folks got to work developing two standards: RADIUS and TACACS+ Both standards offer authentication, authorization, and accounting

Summary

nevertheless, abstract, because the DEN specification leaves off where vendor and user implementation begin To take another example, DEN has a class for microchips, but it does not have classes for particular kinds of chips This is what's meant by base schema Network device makers that are incorporating the specific Motorola or IBM chips are responsible for deciding what data about those devices to store, which they do by creating subclasses to hold information specific to particular product lines This is what's meant by extended schema the schema is extended from a superclass to a subclass As a DEN-compliant technology, Active Directory features this type of extensibility

RADIUS Remote Authentication Dial-In User Service (RADIUS) is the better known of the two AAA standards and, as its name implies, was created to support ISPs with thousands of modems in hundreds of computers to connect to a single central database RADIUS consists of three devices: the RADIUS server that has access to a database of user names and passwords, a number of Network Access Servers (NASs) that control the modems, and a group of systems that dial into the network (Figure 11-23)

WINS uses a database replication process to populate every WINS server with current name/address mappings To keep things running smoothly, the information must be replicated in an organized manner This starts with identifying servers to each other as replication partners The communication relationship between the partner servers is classified as push, pull, or both push and pull A pull partner is one that receives updates from the other server by periodically requesting that server's WINS database entries A push partner will send the other server update notifications as registrations occur and as the WINS database changes The primary and secondary WINS servers, both of which should always exist for fault tolerance, must be push and pull partners with each other, as illustrated in Figure 11-6

In this chapter, we wrapped up the discussion of mappings or transformations begun in Chap 9 First we stated the Riemann mapping theorem, which guarantees the existence of a mapping between a region of the w plane and a region of the z plane Next we introduced the Schwarz-Christoffel transformation, which allows us to map a polygon to the upper half plane

EXAM TIP NAS stands for either Network Access Server or Network Attached Storage Make sure you read the question to see which NAS it s looking for! To use RADIUS you need a RADIUS server The most popular choice for Microsoft environments is Internet Authentication Service (IAS) IAS comes built in with most versions of Microsoft Windows Server operating systems For the UNIX/Linux crowd, the popular (yet, in my opinion, hard to set up) FreeRADIUS is the best choice If you prefer a more prepackaged server, you might look at Juniper Network s Steel-Belted RADIUS a very powerful and somewhat easy to set up option that many people feel is well worth the roughly $3000 price tag A single RADIUS server can support multiple NASs and provide a complete PPP connection from the requesting system, through the NAS, all the way to the RADIUS server Like any PPP connection, the RADIUS server supports PAP, CHAP, and MS-CHAP Even if you use PAP, RADIUS hashes the password so that at no time is the user name/password exposed Newer versions of RADIUS support even more authentication methods, as you will soon see RADIUS performs all this authentication on either UDP ports 1812 and 1813 or UDP ports 1645 and 1646

Figure 11-6: WINS server push/pull relationship In most cases, all WINS servers on the network will be push/pull partners so that the name space is kept as consistent as possible Great care should be taken in designing and configuring a WINS server environment One small oversight or error in the configuring can cause database inconsistencies and other problems that are difficult to identify and resolve