vb.net generate code 39 Implementing a DNS Infrastructure in Visual Studio .NET

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5
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Implementing a DNS Infrastructure
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Lesson 2: Configuring Zone Properties and Transfers
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You can perform many essential tasks related to administering and managing a DNS infrastructure through the properties dialog boxes of your network s hosted zones. These tasks include configuring and managing zone transfers, enabling dynamic updates, and modifying zone types.
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After this lesson, you will be able to
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Configure a DNS zone for dynamic updates Change the DNS zone type Store zone data in the Active Directory database Add name server (NS) resource records to a zone Configure zone transfers from secondary zones Describe the events that can trigger a zone transfer Describe the process of a zone transfer
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Estimated lesson time: 70 minutes
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Exploring DNS Zone Properties
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The primary means to configure zone settings is through the zone properties dialog box, which is accessible through the DNS console. Each properties dialog box for a standard zone has five tabs: General, Start Of Authority (SOA), Name Servers, WINS, and Zone Transfers. Properties dialog boxes for Active Directory integrated zones include a sixth tab, Security, that allows you to configure access permissions for the zone. To open a properties dialog box for a particular zone, right-click the node of the zone you want to configure in the DNS console, and then select Properties, as shown in Figure 5-13.
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Lesson 2
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Configuring Zone Properties and Transfers
5-21
Figure 5-13
Opening the properties dialog box for a zone
General Tab
The General tab, shown in Figure 5-14, allows you to temporarily suspend name reso lution and to configure four basic features: zone type (including Active Directory inte gration), zone file name, dynamic updates, and aging.
Figure 5-14
General tab
5-22
5
Implementing a DNS Infrastructure
Zone Status The Pause button allows you to pause and resume name resolution for the zone. Note that this feature does not allow you to pause or resume the DNS Server service. Zone Type Clicking Change opens the Change Zone Type dialog box, as shown in Figure 5-15.
Figure 5-15
Change Zone Type dialog box
The Change Zone Type dialog box allows you to reconfigure the zone as a primary, secondary, or stub zone. A primary zone stores the most current records and settings for the zone. For each standard zone that is not Active Directory integrated, only one primary DNS server is allowed, and this server contains the only read/write version of the zone database. A secondary zone is a read-only copy of the primary zone used to improve performance and fault tolerance. A stub zone is a copy of a zone that contains only those resource records necessary to identify the actual authoritative DNS servers for that zone. (Stub zones are discussed in more detail in Lesson 5 of this chapter.) Active Directory Service Integration Selecting the Store The Zone In Active Direc tory check box in the Change Zone Type dialog box allows you to store the primary zone information in the Active Directory database instead of in the WINDOWS\System32\Dns folder. In Active Directory integrated zones, zone data is repli cated through Active Directory. In most cases, this eliminates the need to configure zone transfers to secondary servers.
Exam Tip To migrate a standard primary server, configure a secondary server, transfer the zone to the secondary server, and then promote the secondary server to a primary server. After the secondary server has been promoted, you can delete the original primary server.
There are several advantages to integrating your DNS zone with Active Directory. First,
because Active Directory performs zone replication, you do not need to configure a
Lesson 2
Configuring Zone Properties and Transfers
5-23
separate mechanism for DNS zone transfers. Fault tolerance, along with improved per formance from the availability of multiple read/write primary servers, is automatically supplied by the presence of multimaster replication on your network. Second, Active Directory allows for single properties of resource records to be updated and replicated among DNS servers. Avoiding the transfer of many and complete resource records decreases the load on network resources during zone transfers. Finally, Active Direc tory integration allows you to configure access security for stored records, which prevents unauthorized updates.
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