Active Directory Domain Services Introduction in Visual Studio .NET

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of the world instead of one the other side of the room, and likewise, domain controllers would just replicate whenever they wanted There was no concept of replicating to the closest domain controller AD uses the concept of sites, which allows you to document the physical infrastructure of your organization in terms that AD can understand A big change from NT 40 is that for intrasite and intersite replication, only the modi ed attribute is replicated Previously if a single attribute changed, the whole object replicated Now only the modi ed attribute replicates, saving a lot of bandwidth and replication-processing resources Given that TCP/IP is mandatory for AD (because you use DNS and LDAP along with other things) and the nature of IP, your physical environment is likely to be broken up, with different locations using different IP subnets An AD site is denoted by one or more IP subnets, and the site is given a name to re ect the location of those subnets In the real world, each of your locations connect to each other by a variety of connectivity types; for example, T1 lines, ISDN, frame relay, and xDSL, each of which has associated network speeds AD documents these connectivities as site links, which have a number of attributes; the most important is the site s cost This cost relates to the site s available bandwidth; the lower the cost, the faster the link In other words, it costs less to use the link The availability of the link can also be de ned For example, there might be some links that are not available at night, so this needs to be documented as a property of the link This site and site link information is stored in the Con guration partition, which is replicated to all domain controllers in the forest Therefore, sites are common to all domains in the forest and do not have to be de ned for each domain The actual process is fairly straightforward First create site links for all the connections you have between locations (for example, DallasToLondon) Then create all your sites, and during the site creation, specify which site link it belongs to (you can change the site link at a later time if required and even add to multiple site links, which is the case for hub-type locations) Then de ne the IP subnets linked to a site When deciding which IP subnets to place in a site, as long as the subnets are geographically within the same area and are connected via a LAN, over 10Mbps for example (although a speed as low as 512Kbps can be adequate), they can be con gured as a site A site is de ned as a group of computers communicating via high-speed, reliable connectivity Putting this together, you get a site topology similar to that shown in Figure 10-27
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FIGURE 10-27 In your environment, you have three locations with Dallas as the hub
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Let s walk through creating the sites and site links described earlier The rst action is to create the actual site, which you achieve by rightclicking Sites and selecting the New Site context menu item Enter the name of the site and select a site link Don t worry that it s not the nal site link, just select any site link (such as, DEFAULTIPSITELINK) as shown in Figure 10-28 Repeat this process for all the sites you want to add
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FIGURE 10-28 Creating a new site is a simple procedure
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When you have the sites, you can add site links that control how the actual replication is performed Select the transport you want to con gure for the intersite replication, which is always IP, and select New Site Link You are prompted for a name for the site link, so make it something logical (eg, Dallas to London), select the sites connected by the new site link, and select Add as shown in Figure 10-29 You always need at least two sites in any site link Once the site link is created, its properties can be modi ed to set items such as the cost of the site link and how often it replicates, as shown in Figure 10-30 If you click the Change Schedule button, you can con gure the hours of the week that replication can occur, which allows you to stop replication occurring at times when you might want to save bandwidth for other uses or if, perhaps, the link was unavailable After you have created site links, ensure that you either remove all the sites from the DEFAULTIPSITELINK or simply delete DEFAULTIPSITELINK because it s no longer needed
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