c# wpf qr code generator Figure 3-11 Adding an NS record to specify a server hosting a secondary zone in C#.NET

Create QR Code in C#.NET Figure 3-11 Adding an NS record to specify a server hosting a secondary zone

Figure 3-11 Adding an NS record to specify a server hosting a secondary zone
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Configuring a DNS Zone Infrastructure
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Enabling transfers to secondary zones
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Note that a secondary zone will not be recognized as a valid name server until it contains a valid copy of zone data. For the secondary zone to obtain this data, you must first enable zone transfers to that server by using the Zone Transfers tab in the zone properties dialog box. This tab is discussed in more detail in Lesson 2, Configuring Zone Replication and Transfers.
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After you create the record, a line such as the following appears in the standard zone file:
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@ NS dns1.lucernepublishing.com.
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In this record, the @ symbol represents the zone defined by the SOA record in the same zone file. The complete entry, then, effectively maps the lucernepublishing.com domain to a DNS server named dns1.lucernepublishing.com.
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Beyond the SOA and NS records, some other resource records are also created automatically. For example, if you choose to install a new DNS server when promoting a server to a domain controller, many SRV records for AD DS services are automatically created in the locally hosted zone. In addition, through dynamic updates many DNS clients automatically register host (A or AAAA) and pointer (PTR) records in a zone by default. Even though many resource records are created automatically, in a production environment you usually need to create some resource records manually as well. Such records might include (Mail Exchanger) MX records for mail servers, Alias (CNAME) records for Web servers or application servers, and host records for servers or clients that cannot perform their own updates. To add a resource record for a zone manually, right-click the zone icon in the DNS Manager console, and then choose the type of resource record you want to create from the shortcut menu. Figure 3-12 demonstrates the creation of a new MX record. After you make your selection from the shortcut menu, a new dialog box appears in which you can specify the name of the record and the computer associated with it. Figure 3-13 shows the New Resource Record dialog box that appears for the creation of a new MX record. Note that only host records associate the name of a computer with the actual IP address of the computer. Most record types associate the name of a service or alias with the original host record. As a result, the MX record shown in Figure 3-13 relies on the presence in the zone of a host record named SRV12.nwtraders.msft.
Lesson 1: Creating and Configuring Zones
Figure 3-12 Creating a new resource record
Figure 3-13 Defining a new MX record
3
Configuring a DNS Zone Infrastructure
Record Types
The most common resource records you need to create manually include the following:
Host (A or AAAA) Alias (CNAME) Mail exchanger (MX) Pointer (PTR) Service location (SRV)
Host (A or AAAA) Resource Records For most networks, host resource records make up the majority of resource records in a zone database. These records are used in a zone to associate computer names (host names) to IP addresses. After you create them in the DNS Manager console, an A resource record that maps the host name server1.lucernepublishing.com to the IPv4 address 192.168.0.99 and an AAAA resource record that maps the same name to the IPv6 address fd00:0:0:5::8 would be represented textually within the standard zone file lucernepublishing.com.dns in the following way:
; ; ; Zone records
server1
A AAAA
192.168.0.99 fd00:0:0:5::8
Even when dynamic updates are enabled for a particular zone, in some scenarios it might be necessary to add host records manually to that zone. For example, in Figure 3-14 a company named Contoso, Inc., uses the domain name contoso.com for both its public namespace and its internal Active Directory domain. In this case the public Web server named www.contoso.com is located outside the Active Directory domain and performs updates only on the public DNS server authoritative for contoso.com. Internal clients, however, point their DNS requests toward internal DNS servers. Because the A record for www.contoso.com is not updated dynamically on these internal DNS servers, the record must be added manually for internal clients to resolve the name and connect to the public Web server. Another case in which you might need to add host records manually is when you have a UNIX server on your network. For example, in Figure 3-15 a company named Fabrikam, Inc., uses a single Active Directory domain named fabrikam.com for its private network. The network also includes a UNIX server named App1.fabrikam.com that runs an application critical to the company s daily operations. Because UNIX servers cannot perform dynamic updates, you need to add a host record for App1 on the DNS server hosting the fabrikam.com zone. Otherwise, users will not be able to connect to the application server when they specify it by FQDN.
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