Understand more on Microsoft DNS Server (Part III)

Forward Lookup Zones

When each and every new zone is created, 2 types of records required will be created automatically.

  • Start of Authority (SOA) record that defines basic properties for the zone
  • At least one NS record signifying the name of the server or servers authoritative for the zone.

Double click the SOA record; open the Start Of Authority (SOA) tab of the zone properties dialog box as below

Serial Number

  • Contain the revision number of the zone file. The number increase each time a resource record changes in the zone or manually increment the value in the tab by clicking Increment
  • When the serial number is to determine to be equivalent to the serial number stored on the secondary, no transfer is made
  • If the serial number for the zone at the master server is greater than the requesting secondary server, the secondary server initiates a transfer
  • By clicking the Increment button, a zone transfer is force

Primary Server

  • Primary DNS Server of the zone

Every server hosting a primary copy of an Active Directory-integrated zone will have its own NS record appear in the new zone by default. However NS records need to manually add for servers hosting secondary zones on a primary copy of the zone.

A secondary zone will not be recognized as a valid name server until it contains a valid copy of zone date. In order for secondary zone to obtain this data, enable zone transfers to the server by using the Zone Transfer tab in the zone properties dialog box

Enabling DNS to Use WINS Resolution

If a DNS client queries cannot find the answer through any of its usual sources (cache, local zone data, queries to other servers), the server then queries the WINS server specified in the WINS record for the name

Aging and Scavenging

Aging refer to the process of using timestamps to track the age of dynamically registered resource records.

Scavenging refers to the process of deleting outdated resource records. In Windows Server 2008, both aging and scavenging are disabled by default.

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