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as the basis for controlling what objects in the AD LDS instance a requesting user can access With AD, be careful about modifying the schema due to the scope of the change and the possible implications With AD LDS you need not have the same concern; the AD LDS is a separate directory instance For example, an application might want to store a large amount of information that is not globally of interest or that you might not want replicated to every domain controller AD LDS uses a totally separate database from AD, which means you can have a separate schema for each ADAM instance That can be useful for testing In this arrangement, all your user accounts, computer accounts, policies, and so on reside in AD You could create an AD LDS instance and import a schema de nition that describes the attributes and object classes used by the application Then the application can communicate with the AD LDS for application-speci c information This is why the original name of AD LDS was AD Application Mode; it s for use by applications Figure 13-1 shows an example with a domain for a company that sells many different clothing items This company has just branched out into a special custom hat solution, so it purchased a hat application that has to store details about the various hat con gurations and the clients in a directory service The application has a special hat object class and user objects for its customers The central IT team had no desire to add the hat object to the AD used globally or to store customer details for one part of the company So, it created an AD LDS instance to hold information related to the application However, there can still be integration, and you can create links between AD users and objects in AD LDS
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FIGURE 13-1 Poor AD LDS usage example involving hats Other services and applications use ADAM/AD LDS as a way to store information from AD without having access to a domain controller For example, Exchange 2007 Edge servers are placed in the demilitarized zone (DMZ) of the network and are not members of the domain However, they
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need information about the AD con guration and recipient information to perform lookups on incoming mail to ensure that it should be accepted To solve this, place an ADAM instance in the DMZ and, using an Exchange component called EdgeSync, perform a one-way replication from AD to replication con guration and recipient information to the ADAM instance to which the Edge server has access Just because AD LDS is not AD does not mean you cannot make it highly available It has many of the capabilities of AD including multimaster replication and its own site con guration There are complexities, however AD LDS does not use the same graphical tools as AD You cannot use AD Users and Computers However, with AD LDS you can use the AD Sites and Services Microsoft Management Console (MMC) snap-in to manage an AD LDS instance if you import certain schema de nitions Where no graphical tools exist, it s because AD LDS is designed to be con gured and accessed via the application using the AD LDS instance For manual con guration, you can use the adsieditmsc application, which has the capability to access all the data within the AD LDS instance, including its con guration partition There you can create site and site link objects to control replication if you don t want to import the MS-AD LDSDisplaySpeci ersLDF schema de nition needed to use AD Sites and Services By default, as with AD, all the servers that are servicing the AD LDS exist in the same Default-First-Site-Name site You can add replicas of an AD LDS instance, making it highly available The tools you use to troubleshoot replication, such as REPADMIN, are the same tools you use for AD LDS replication You also have a separate version of ntdsutil just for AD LDS: DSDBUTIL AD LDS, like AD, offers a Lightweight Directory Access Protocol (LDAP) interface, both secure and insecure, enabling LDAP- and ADbased applications to seamlessly use AD LDS without even knowing it is communicating with AD LDS and not AD Multiple instances of AD LDS can run on a server, although each instance could not listen on the same LDAP ports For example, 389 and 636 could be used by only one instance unless you install AD LDS on a domain controller, in which case those ports are already being used by AD LDS Each instance of AD LDS is unique, can use different schemas, and is unrelated to the others running on the same box in any way
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