AZ-104 Question 236
Single answerYour company has a custom domain name (for example, contoso.com) registered with an external provider. You need to configure Azure DNS to host all DNS records for contoso.com and handle internet-facing name resolution. Which step must you perform to ensure that DNS queries for contoso.com are resolved by Azure DNS?
- A
Register a new contoso.com domain name directly in Azure DNS and enable public zone hosting
- B
Create a Private DNS zone in Azure for contoso.com and link it to a virtual network
- C
Create a public DNS zone in Azure for contoso.com and update the domain registrar’s NS records with the Azure-provided name servers
- D
Configure Azure DNS by adding a CNAME record at the registrar pointing to an Azure DNS authoritative zone
Show answer and explanation
Correct answer: C
Explanation
To host a domain publicly in Azure DNS, you must create a corresponding public DNS zone and then update the name server (NS) records with your external domain registrar to ensure authoritative queries route to Azure DNS. Private DNS zones and CNAME records alone are insufficient to achieve public resolution for your domain.
- A. Incorrect.
Registering a new domain in Azure is optional; you can host DNS for an existing domain in Azure without re-registering the domain.
- B. Incorrect.
Private DNS zones are used for internal name resolution within virtual networks and are not publicly accessible.
- C. Correct.
Creating a public DNS zone and updating your domain’s NS records at the registrar to point to Azure DNS is the correct way to delegate authoritative DNS hosting.
- D. Incorrect.
Simply adding a CNAME record at the registrar does not delegate authoritative hosting of DNS to Azure.