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Designing a Site Plan
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physical layout of the network. Sites take the responsibility for representing the physical layout within Active Directory. Because sites are independent of the domain structure, a single domain can include multiple sites or a single site can include multiple domains, as shown in Figure 5-2.
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A single site for each domain
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Figure 5-2 Sites and domains are independent.
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Sites are not part of the Active Directory namespace. When a user browses the logical namespace, computers and users are grouped into domains and OUs without refer ence to sites. However, site names are used in the Domain Name System (DNS) records, so sites must be given valid DNS names. Unless you configure your own sites in Active Directory, all domain controllers are automatically made a part of a single site a default site named Default-First-SiteName that is created when you create the first domain. Sites contain only two types of objects. The first type is the domain controllers contained in the site. The second type of object is the site links configured to connect the site to other sites. Generally speaking, sites are used to control traffic over WAN links. More specifically, sites are used to control the following:
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Workstation logon traffic Replication traffic Distributed File System (DFS) File Replication Service (FRS)
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When a user logs on to the network, Microsoft Windows 2000 and Microsoft Windows XP computers search for domain controllers in the same site as the workstation. During logon, domain controllers use a client s IP address to determine which site the client is actually from and send the site information back to the client. The domain controller also sends information to the client about the closest domain controller. This informa tion is cached for future use to increase logon efficiency.
Lesson 1
Designing a Site Topology
Using a domain controller in the same site prevents authentication traffic from crossing WAN links unnecessarily. If there is no domain controller at a client s location, the client authenticates itself using a domain controller in a site that has the lowest cost connec tion relative to other sites. Service (SRV) records are created in DNS and provide each site with a preferred domain controller for authentication.
Controlling Replication Traffic
Active Directory uses a replication model called multimaster replication, in which all replicas of the Active Directory database are considered equal masters. Changes made to the Active Directory database on any domain controller are automatically replicated to all other domain controllers in the domain. Within the boundaries of a site, domain controllers replicate changes as they happen. When a change is made on one domain controller, it notifies its replication partners (the other domain controllers in the site); the partners then request the changes and replication occurs almost immediately. Replication between domain controllers in the same site is transmitted in an uncompressed format. Because a high bandwidth connec tion is assumed, using an uncompressed format ensures that the replication happens as quickly as possible, even though it generates more network traffic. Replication between sites happens a bit differently. When replication occurs between sites, a single domain controller for each domain in each site collects and stores the directory changes, compresses them, and then transmits them at a scheduled time to a domain controller in another site. Between sites, replication is optimized for efficiency rather than for speed. You ll learn more about the replication process in Lesson 3.
Controlling a Distributed File System (DFS) Topology
Distributed File System (DFS) is a server component that provides a unified naming convention for folders and files stored on different servers on a network. DFS lets you create a single logical hierarchy for folders and files that is consistent on a network, regardless of where on the network those items are actually stored. Files represented in the DFS might be stored in multiple locations on the network, so it makes sense that Active Directory should be able to direct users to the closest physical location of the data they need. To this end, DFS uses site information to direct a client to the server that is hosting the requested data within the site. If DFS does not find a copy of the data within the same site as the client, DFS uses the site information in Active Directory to determine which file server that has DFS shared data is closest to the client.
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