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Figure 26-4.
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DNS zones on separate servers.
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Part 6: Managing Windows Server 2003 Networking and Print Services
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Microsoft Windows Server 2003 Inside Out Although you can configure DNS services in this way, your organization s domain structure is separate from its zone configuration. If you create subdomains of a parent domain, they can either be part of the same zone or belong to another zone and these zones can be on separate DNS servers or the same DNS servers. The example in Figure 26-5 shows a wide area network (WAN) configuration. The branch offices in Seattle and New York are separate from the company headquarters, and key zones are organized geographically. At company headquarters there s an additional zone running on the same DNS name server as the zone for the cpandl.com domain. This zone handles services.cpandl.com, tech.cpandl.com, and sales.cpandl.com.
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Zone Zone
Part 6: Managing Windows Server 2003 Networking and Print Services
26
DNS Zone transfer
DNS Zone transfer
sea.cpandl.com
ny.cpandl.com
DNS cpandl.com Zone services.cpandl.com tech.cpandl.com sales.cpandl.com
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Zone
Figure 26-5.
Zones can be separate from domain structure.
Zones That Are Integrated with Active Directory
Using Active Directory integrated zones, you can store DNS zone information within Active Directory. This gives you several advantages. Any primary zone or stub zone integrated with Active Directory is automatically replicated to other domain controllers using Active Directory replication. Because Active Directory can compress replication data between sites, you can more efficiently replicate traffic, and this is especially important over slow WAN links.
Part 6: Managing Windows Server 2003 Networking and Print Services
Architecting DNS Infrastructure Figure 26-6 shows an example of Active Directory integrated zones and replication. Here, zone information for cpandl.com, seattle.cpandl.com, portland.cpandl.com, and sf.cpandl.com has been integrated with Active Directory. This allows any DNS changes made at branch offices or at company headquarters to be replicated throughout the organization to all the available name servers. Because the decision to integrate zones with Active Directory isn t an all-or-nothing approach, there are also standard primary and secondary zones, and standard DNS zones transfers are used to maintain these zones.
Active Directory
Active Directory replication
seattle.cpandl.com DNS Active Directory Active Directory replication Active Directory Zone transfer
sales.cpandl.com DNS
portland.cpandl.com Active Directory
DNS Active Directory replication
Copy of zone
cpandl.com sf.cpandl.com
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Figure 26-6.
Active Directory integrated zones.
Inside Out
Multimaster replication for DNS changes By using Active Directory integration, copies of zone information are maintained on all domain controllers that are also configured as DNS servers. This is different from standard DNS zones. When you use standard zones, there s a single authoritative DNS server for a zone, and it maintains a master copy of the zone. All updates to the primary zone must be made on the primary server. With Active Directory integrated zones, each domain controller configured as a DNS server in a domain is an authoritative server for that domain. This means clients can make updates to DNS records on any of these servers and the changes will be automatically replicated.
Part 6: Managing Windows Server 2003 Networking and Print Services
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Microsoft Windows Server 2003 Inside Out Active Directory integrated zones have changed substantially since they were first implemented. In Windows 2000, DNS information is stored in the same context as other Active Directory information. This means updates to DNS records are automatically replicated to all domain controllers in the domain regardless of whether those domain controllers are also DNS name servers. In an organization with many domain controllers but only a few DNS name servers, this means there is a lot of unnecessary traffic on the network. Additional planning is also required to ensure all domain controllers are able to resolve the forest-side locator records stored in the _msdcs subdomain in the forest root domain. In Windows Server 2003, default application partitions are used to ensure that DNS information is replicated only to domain controllers that are also configured as DNS servers. Here s how it works: For every domain in an Active Directory forest, a separate application partition is created and used to store all records in each Active Directory integrated zone configured for that domain. Because the application partition context is outside that of other Active Directory information, DNS information is no longer replicated with other Active Directory information. There s also a default application partition that stores DNS information and replicates that information to all DNS servers in an Active Directory forest. This simplifies DNS replication for organizations with multiple domains. Note
Only domain controllers running Windows Server 2003 can use default application partitions to replicate DNS information in this way. Because of this, you can take advantage of this feature when the domain controllers in all the domains of your forest are running Windows Server 2003.
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