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Difficulty: MediumConfigure Azure DNS Private and Public Zones

You manage a public Azure DNS zone named `contoso.com`. You need to delegate a new subdomain named `east.contoso.com` to a separate public DNS zone in Azure DNS. Which sequence of actions should you perform to complete the delegation?

  1. 1Create a new public Azure DNS zone named `east.contoso.com`.
  2. 2Note the 44 name servers (NS) assigned to the `east.contoso.com` zone.
  3. 3Create a new NS record set named `east` in the parent `contoso.com` zone.
  4. 4Add the noted name server names to the newly created `east` NS record set.

Answer

To delegate a subdomain in Azure DNS, you must first create the public child DNS zone (`east.contoso.com`), retrieve the 44 assigned name servers for that child zone, create a new NS record set named `east` in the parent DNS zone (`contoso.com`), and then populate that NS record set with the name servers noted from the child zone.
The correct sequence starts with creating the child zone because Azure DNS assigns name servers dynamically during creation. Once the child zone is active, the administrator notes the assigned name servers. The final steps require creating an NS record set in the parent zone and populating it with the child zone's name servers, establishing the authoritative link.

Step-by-Step Solution

1
Create the child DNS zone `east.contoso.com`.
The child zone is created and Azure DNS automatically generates NS and SOA records containing the assigned name servers.
You cannot retrieve name servers or link the subdomain until the child zone resource exists in Azure.
2
Retrieve and note the name servers (NS) from the child zone.
You obtain the list of the 44 unique Azure name server addresses assigned to host the subdomain.
These specific name servers are required to tell the parent zone where to direct queries for the subdomain.
3
Create a new NS record set named `east` in the parent `contoso.com` zone.
An NS record set placeholder for the `east` subdomain is created in the parent zone.
The parent zone must contain a delegation record to route traffic for the subdomain.
4
Populate the new NS record set with the child zone's name servers.
The parent zone points directly to the child zone's authoritative name servers.
This establishes the active DNS delegation, completing the configuration.

Key Concept

DNS subdomain delegation in Azure DNS requires creating the child zone, retrieving its designated name servers, and adding those name servers as an NS record set in the parent zone.
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Topics

Configure Azure DNS Private and Public Zones

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