c# wpf qr code generator Lesson 1: Creating and Configuring Zones in C#

Creator QR Code in C# Lesson 1: Creating and Configuring Zones

Lesson 1: Creating and Configuring Zones
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Lesson 1: Creating and Configuring Zones
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A zone is a database that contains authoritative information about a portion of the DNS namespace. When you install a DNS server with a domain controller, the DNS zone used to support the Active Directory domain is created automatically. However, if you install a DNS server at any other time, either on a domain controller, domain member server, or stand-alone server, you have to create and configure zones manually. This lesson describes the steps required to create and configure a zone, as well as the underlying concepts you need to understand in order to configure a zone properly.
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After this lesson, you will be able to: Create and configure DNS zones. Create and configure resource records. Estimated lesson time: 120 minutes
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Creating Zones
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A DNS zone is a database containing records that associate names with addresses for a defined portion of a DNS namespace. Although a DNS server can use cached information from other servers to answer queries for names, it is only through a locally hosted zone that a DNS server can answer queries authoritatively. For any portion of a DNS namespace represented by a domain name such as proseware.com, there can only be one authoritative source of zone data. To create a new zone on a DNS server, you can use the New Zone Wizard in DNS Manager. To launch this wizard, right-click the server icon in the DNS Manager console tree, and then choose New Zone, as shown in Figure 3-1. The New Zone Wizard includes the following configuration pages:
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Zone Type Active Directory Zone Replication Scope Forward or Reverse Lookup Zone Zone Name Dynamic Update
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The sections that follow describe the configuration concepts related to these five wizard pages.
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Configuring a DNS Zone Infrastructure
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Figure 3-1
Creating a new zone
Choosing a Zone Type
The Zone Type page of the New Zone Wizard, shown in Figure 3-2, enables you to create your choice of a primary zone, a secondary zone, or a stub zone. If you are creating a primary or stub zone on a domain controller, you also have the option to store zone data in Active Directory.
Figure 3-2
Choosing a zone type
Lesson 1: Creating and Configuring Zones
Primary Zones A primary zone is the main type of DNS zone. A primary zone provides original read-write source data that allows the local DNS server to answer DNS queries authoritatively about a portion of a DNS namespace. When the local DNS server hosts a primary zone, the DNS server is the primary source for information about this zone, and the server stores the master copy of zone data in a local file or in Active Directory Domain Services (AD DS). When the zone is stored in a file instead of Active Directory, by default the primary zone file is named zone_name.dns, and this file is located in the %systemroot%\System32\Dns folder on the server. Secondary Zones A secondary zone provides an authoritative, read-only copy of a primary zone or another secondary zone. Secondary zones provide a means to offload DNS query traffic in areas of the network where a zone is heavily queried and used. Additionally, if the zone server hosting a primary zone is unavailable, a secondary zone can provide name resolution for the namespace until the primary server becomes available again. The source zones from which secondary zones acquire their information are called masters, and the data copy procedures through which this information is regularly updated are called zone transfers. A master can be a primary zone or other secondary zone. You can specify the master of a secondary zone when the secondary zone is created through the New Zone Wizard. Because a secondary zone is merely a copy of a primary zone that is hosted on another server, it cannot be stored in AD DS. Stub Zones A stub zone is similar to a secondary zone, but it contains only those resource records necessary to identify the authoritative DNS servers for the master zone. Stub zones are often used to enable a parent zone like proseware.com to keep an updated list of the name servers available in a delegated child zone, such as east.proseware.com. They can also be used to improve name resolution and simplify DNS administration. Storing the Zone in Active Directory When you create a new primary or stub zone on a domain controller, the Zone Type page gives you the option to store the zone in Active Directory. In Active Directory integrated zones, zone data is automatically replicated through Active Directory in a manner determined by the settings you choose on the Active Directory Zone Replication Scope page. In most cases this option eliminates the need to configure zone transfers to secondary servers. Integrating your DNS zone with Active Directory has several advantages. First, because Active Directory performs zone replication, you do not need to configure a separate mechanism for DNS zone transfers between primary and secondary servers. Fault tolerance, along with improved performance from the availability of multiple read/write primary servers, is automatically supplied by the presence of multimaster replication on your network. Second, Active
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