Understand more on Microsoft DNS Server (Part IV)

Record Types

Most of the time in DNS the records are created automatically, but sometimes we may require to manually creating records which include the following

  • Host (A or AAAA)
  • Alias (CNAME)
  • Mail exchanger (MX)
  • Pointer (PTR)
  • Service location (SRV)

Host (A or AAAA)

In some scenarios it might be necessary to add host records manually to the zone even dynamic updates are enabled. For example, organization’s public web server, UNIX and etc

Alias (CNAME)

Sometimes are called canonical names. These records allow using more than one name to point to a single host. CNAME can be used in the following scenarios:

  • Map ftp.testlab.com to the actual A resource record of the computer hosting the service servername.testlab.com
  • 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 computer (each with individual A resource records) that provide the same server (for example, a group of redundant Web servers)

Mail Exchanger (MX)

MX is used by email applications to locate a mail server within a zone. Multiple MX records are often created to provide fault tolerance and failover to another mail server when the preferred server list is not available. Multiple servers are given a server preference value, with the lower values it represent the higher preference.

Pointer (PTR)

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 FQDN

Service Location (SRV)

SRV resource records are used to specify the location of specific services in a domain. Client application that is SRV-aware can use DNS to retrieve the SRV resource records for given application servers

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