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If either of these application directory partitions is deleted or damaged, you can recre ate them in the DNS console by right-clicking the server node and selecting Create Default Application Directory Partitions.
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Creating custom application directory partitions You can also create your own custom application directory partitions for use with DNS and enlist chosen domain controllers in your network to host replicas of this partition. To accomplish this task, first create the partition by typing the following command: dnscmd [servername] /createdirectorypartition FQDN Then enlist other DNS servers in the partition by typing the following command: dnscmd servername /enlistdirectorypartition FQDN For example, to create an application directory partition named SpecialDns on a computer named Server1 in the Active Directory domain contoso.com, type the following command: dnscmd server1 /createdirectorypartition SpecialDns.contoso.com
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Implementing a DNS Infrastructure
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To enlist a computer named Server2 in the application directory partition, type the following command: dnscmd server2 /enlistdirectorypartition SpecialDns.contoso.com
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You must be a member of the Enterprise Admins group to create an application direc tory partition.
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To store DNS data in a custom application directory partition, select the fourth (bottom) option in the Change Zone Replication Scope dialog box, and specify the custom application directory partition in the drop-down list box. This option To All Domain Controllers Specified In The Scope Of The Following Application Directory Partition is available only if custom application directory partitions are available for DNS on your network.
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Replication with Windows 2000 servers Because application directory partitions are not available on Windows 2000 domain controllers, you must select the third option in the Change Zone Replica tion Scope dialog box if you want the zone data to be read by Windows 2000 DNS servers. With this option To All Domain Controllers In the Active Directory Domain data is not replicated merely among all DNS server domain controllers, but among all domain controllers regardless of whether they are also DNS servers.
Exam Tip Expect to be tested on application directory partition concepts and commands, as well as the options in the Change Zone Replication Scope dialog box.
Zone File Name For standard zones not stored in Active Directory, the default zone filename is created by adding a .dns extension to the zone name. The Zone File Name text box on the General tab allows you to change the default name of this file. Dynamic Updates The General tab also allows you to configure a zone with dynamic updates in resource records. As shown in Figure 5-18, three dynamic update settings are available for Active Directory integrated DNS zones: None, Nonsecure And Secure, and Secure Only. For standard zones, only two settings are available: None and Nonsecure And Secure.
Lesson 2
Configuring Zone Properties and Transfers
5-27
Figure 5-18
Zone settings for dynamic updates
When you select the None setting in the properties for a zone, you must manually perform registrations and updates to zone records. However, when you enable either the Nonsecure And Secure setting or the Secure Only setting, client computers can auto matically create or update their own resource records. This functionality greatly reduces the need for manual administration of zone records, especially for DHCP cli ents and roaming clients. Figure 5-19 shows a typical dynamic update process.
Find authoritative server Result (zone name and authoritative server's name and IP address) Client Local name server
Attempt dymanic update Result (success or failure) Server that is authoritative for name
Figure 5-19
Dynamic update process
5-28
5
Implementing a DNS Infrastructure
Whenever a triggering event occurs on a DNS client computer, the DHCP Client service, not the DNS Client service, attempts to perform a dynamic update of the A resource record with the DNS server. This update process is designed so that if a change to the IP address information occurs because of DHCP, this update is immediately sent to the DNS server. The DHCP Client service attempts to perform this dynamic update function for all network connections used on the system, including those not configured to use DHCP. Whether this attempt at a dynamic update is successful depends first and foremost on whether the zone has been configured to allow dynamic updates. Dynamic Update Triggers The following events trigger the DHCP Client service to send a dynamic update to the DNS server:
An IP address is added, removed, or modified in the Transmission Control Proto col/Internet Protocol (TCP/IP) properties configuration for any one of the local computer s installed network connections. An IP address lease changes or renews with the DHCP server for any one of the local computer s installed network connections for example, when the computer is started or if the Ipconfig /renew command is used. The Ipconfig /registerdns command is used on a DNS client computer to manually force a refresh of the client name registration in DNS. The DNS client computer is turned on. A member server within the zone is promoted to a domain controller.
Secure Dynamic Updates Secure dynamic updates can be performed only in Active Directory integrated zones. For standard zones, the Secure Only option does not appear in the Dynamic Updates drop-down list box. These updates use the secure Ker beros authentication protocol to create a secure context and ensure that the client updating the resource record is the owner of that record.
Only clients running a version of Windows 2000, Microsoft Windows XP or Windows , Server 2003 can attempt to send dynamic updates to a DNS server. Dynamic updates are not available for any version of Windows NT, Windows 95, Microsoft Windows 98, or Microsoft Windows Millennium Edition (Me). However, a DNS client computer (such as a DHCP server) can perform dynamic updates on behalf of other clients if the server is configured to do so.
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