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

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

Lesson 1: Creating and Configuring Zones
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Figure 3-14 Adding a host record for a public Web server
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Figure 3-15 Adding a host record for a private UNIX server
3
Configuring a DNS Zone Infrastructure
Exam Tip If you can ping a computer by IP address but not by name, the computer might be missing a host record in DNS. You can attempt to remedy this situation by executing the Ipconfig /registerdns command at that computer but only if the client computer is running Windows 2000 or later. Alias (CNAME) Resource Records Alias (CNAME) resource records are sometimes called canonical names. These records allow you to use more than one name to point to a single host. For example, the well-known server names (ftp, www) are typically registered using CNAME resource records. These records map the host name specific to a given service (such as ftp.lucernepublishing.com) to the actual A resource record of the computer hosting the service (such as server-boston.lucernepublishing.com). CNAME resource records are also recommended for use in the following scenarios:
When a host specified in an A resource record in the same zone needs to be renamed When a generic name for a well-known server such as www needs to resolve to a group of individual computers (each with individual A resource records) that provide the same service (for example, a group of redundant Web servers)
After you create it in the DNS Manager console, a CNAME resource record that maps the alias ftp.lucernepublishing.com to the host name ftp1.lucernepublishing.com would be represented textually within the lucernepublishing.com.dns standard zone file as follows:
ftp CNAME ftp1.lucernepublishing.com.
MX Resource Records The mail exchanger (MX) resource record is used by e-mail applications to locate a mail server within a zone. It allows a domain name such as lucernepublishing.com, specified in an e-mail address such as joe@lucernepublishing. com, to be mapped to the A resource record of a computer hosting the mail server for the domain. This type of record thus allows a DNS server to handle e-mail addresses in which no particular mail server is specified. Multiple MX records are often created to provide fault tolerance and failover to another mail server when the preferred server listed is not available. Multiple servers are given a server preference value, with the lower values representing higher preference. After you create them in the DNS Manager console, such MX resource records would be represented textually within the lucernepublishing.com.dns zone file as follows:
@ @ @ MX MX MX 1 10 20 mailserver1.lucernepublishing.com. mailserver2.lucernepublishing.com. mailserver3.lucernepublishing.com.
Lesson 1: Creating and Configuring Zones
NOTE
What does the @ symbol mean
In this example, the @ symbol represents the local domain name contained in an e-mail address.
PTR Resource Records The pointer (PTR) resource record is used in reverse lookup zones only to support reverse lookups, which perform queries to resolve IP addresses to host names or FQDNs. Reverse lookups are performed in zones rooted in the in-addr.arpa domain. PTR resource records can be added to zones manually or automatically. After you create it in the DNS Manager console, a PTR resource record that maps the IP address 192.168.0.99 to the host name server1.lucernepublishing.com would be represented textually within a zone file as follows:
99 PTR server1.lucernepublishing.com.
NOTE
Why is the PTR record named 99
In a reverse lookup zone, the last octet of an IPv4 address is equivalent to a host name. The 99 therefore represents the name assigned to the host within the 0.168.192.in-addr.arpa zone. This zone corresponds to the 192.168.0.0 subnet.
SRV Resource Records Service location (SRV) resource records are used to specify the location of specific services in a domain. Client applications that are SRV-aware can use DNS to retrieve the SRV resource records for given application servers. Windows Server 2008 Active Directory is an example of an SRV-aware application. The Netlogon service uses SRV records to locate domain controllers in a domain by searching the domain for the Lightweight Directory Access Protocol (LDAP) service. If a computer needs to locate a domain controller in the lucernepublishing.com domain, the DNS client sends an SRV query for the name:
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