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Figure 2-22 Forwarding queries within an Active Directory forest
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When to Use Conditional Forwarding The term conditional forwarding describes a DNS server configuration in which queries for specific domains are forwarded to specific DNS servers. One of the many scenarios in which conditional forwarding is useful is when two separate networks merge. For example, suppose the Contoso and Fabrikam companies have separate networks with Active Directory domains. After the two companies merge, a 128-Kbps leased line
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Configuring Name Resolution
is used to connect the private networks. For clients in each company to resolve queries for names in the opposite network, conditional forwarding is configured on the DNS servers in both domains. Queries to resolve names in the opposite domain will be forwarded to the DNS server in that domain. All Internet queries are forwarded to the next DNS server upstream beyond the firewall. This scenario is depicted in Figure 2-23. Note that conditional forwarding is not the only way to provide name resolution in this type of merger scenario. You can also configure secondary zones and stub zones, which are described in 3, Configuring a DNS Zone Infrastructure. These zone types provide basically the same name resolution service that conditional forwarding does. However, conditional forwarding minimizes zone transfer traffic, provides zone data that is always up-to-date, and allows for simple configuration and maintenance.
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Figure 2-23 A conditional forwarding scenario
To configure conditional forwarding for a domain, you do not use the DNS server properties dialog box. You use the Conditional Forwarders container in the DNS Manager console tree. To add a conditional forwarder, right-click the Conditional Forwarder container, and then choose New Conditional Forwarder, as shown in Figure 2-24. Then, in the New Conditional Forwarder dialog box that opens, specify the domain name for which DNS queries should be forwarded along with the address of the associated DNS server. The New Conditional Forwarder dialog box is shown in Figure 2-25.
Lesson 2: Deploying a DNS Server
Figure 2-24 Adding a conditional forwarder
Figure 2-25 The New Conditional Forwarder dialog box
Exam Tip
You will almost certainly see a question about conditional forwarding on the 70-642 exam. Understand its purpose and scenarios in which it might be useful.
2
Configuring Name Resolution
PRACTICE
Exploring DNS in an Active Directory Environment
In this practice, you create an Active Directory domain named Nwtraders.msft. During the process of creating this Active Directory domain, a DNS server is created for hosting the zone lookup information for Nwtraders.msft. You then explore this zone information along with the DNS server settings, create a domain administrator account for personal use, add the Boston computer to the domain, and observe the new DNS records created for Boston. Practice 1 Creating a Domain Controller In this exercise, you use the Dcpromo program to create a domain controller for a new Active Directory domain named Nwtraders.msft. 1. Log on to Dcsrv1 with the account named Administrator. 2. In the Run box, type dcpromo, and then press Enter. A message appears indicating the Active Directory Domain Services binaries are being installed. After the binaries have been installed, the Active Directory Domain Services Installation Wizard appears. 3. On the Welcome page of the Active Directory Domain Services Installation Wizard, read all the text on the page, and then click Next. 4. On the Operating System Compatibility page, click Next. 5. On the Choose A Deployment Configuration page, select Create A New Domain In A New Forest, and then click Next. 6. On the Name The Forest Root Domain page, type nwtraders.msft, and then click Next. The forest name is verified to ensure that it is unique on the network, and then the NetBIOS name is verified. 7. On the Set Forest Functional Level page, select the Windows Server 2008 functional level, read the text in the Details section, and click Next. 8. On the Additional Domain Controller Options page, verify that DNS Server is selected, read the text in the Additional Information section, and click Next. A dialog box appears and informs you that a delegation for this server cannot be created. You receive this message because you are creating a new DNS root domain and not a subdomain (for example, in the Internet namespace). 9. Click Yes to continue. 10. On the Location For Database, Log Files, And SYSVOL page, review the default settings, and then click Next. 11. On the Directory Services Restore Mode Administrator Password page, read all the text on the page, and then type a password of your choice in the Password and Confirm Password fields.
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