Configure Network Services - MCSA Windows Server 2012 R2: Installation and Configuration Study Guide - page 84

For an entire list of all of the Windows PowerShell DNS cmdlets, go to http: // technet
.microsoft.com / en-us / library / jj649850.aspx .
Introducing DNS Record Types
No matter where your zone information is stored, you can rest assured that it contains a
variety of DNS information. Although the DNS snap-in makes it unlikely that you'll ever
need to edit these files by hand, it's good to know exactly what data is contained there.
As stated previously, zone files consist of a number of resource records. You need to
know about several types of resource records to manage your DNS servers effectively. They
are discussed in the following sections.
Part of the resource record is its class. Classes define the type of network for the
resource record. There are three classes: Internet, Chaosnet, and Hesoid. By far, the
Internet class is the most popular. In fact, it's doubtful that you'll see either Chaosnet or
Hesoid classes in the wild.
The following are some of the more important resource records in a
DNS database. For a listing of records in a Microsoft DNS database, visit
Microsoft's website at http://technet.microsoft.com/en-us/library/
cc958958.aspx .
Start of Authority Records
The first record in a database file is the start of authority (SOA) record . The SOA defines
the general parameters for the DNS zone, including the identity of the authoritative server
for the zone.
The SOA appears in the following format:
@ IN SOA primary_mastercontact_e-mailserial_number
refresh_timeretry_timeexpiration_timetime_to_live
Here is a sample SOA from the domain example.com :
@ IN SOA win2k3r2.example.com. hostmaster.example.com. (
5 ; serial number
900 ; refresh
600 ; retry
86400 ; expire
3600 ) ; default TTL