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Azure DNS

  • Enables you to host your DNS zone and manage your DNS records.
  • DNS zone allows you to configure a private and public DNS zone.
  • Alias recordsets:
    • A – maps the host to IPv4.
    • AAAA – maps the host to IPv6.
    • CNAME – create a record to point to another domain.
  • A limit of 20 alias record sets per resource.
  • Uses Anycast networking to route users to the closest name servers.
  • You can monitor your DNS zone metrics using Azure Monitor.
    • QueryVolume – query traffic received.
    • RecordSetCount – the number of recordsets in your DNS.
    • RecordSetCapacityUtilization – percentage of utilization of your recordset capacity.
  • Azure Private DNS allows you to use your custom domain name in your private VNet.
  • Alias record allows you to point your naked domain or apex to a traffic manager or CDN endpoint.
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Private DNS

  • Allows you to manage and resolve domain names in a virtual network.
  • Configure a split-horizon DNS to create zones with the same name.
  • It also supports all types of DNS records types: A, AAAA, CNAME, MX, PTR, SOA, SRV, and TXT.
  • A virtual network can be linked to only one private zone. But you can link multiple virtual networks to a single DNS zone.
  • Private IP space in the linked virtual network allows reverse DNS.

Security

  • To prevent accidental zone deletion, you can apply a ‘CanNotDelete’ lock.
  • Create a custom role to ensure it doesn’t have a zone delete permission.
  • You can deploy a DNS firewall to mitigate DNS-related security issues.

Pricing

  • Billed on the number of hosted DNS zones.
  • You are charged based on the number of DNS queries received.

Validate Your Knowledge

Question 1

Question Type: Multiple-choice

You have an Azure subscription that contains an Azure DNS zone named tutorialsdojo.com.

There is a requirement to delegate a subdomain named portal.tutorialsdojo.com to another Azure DNS zone.

What solution would satisfy the requirement?

  1. Navigate to tutorialsdojo.com and add a PTR record named portal.
  2. Navigate to tutorialsdojo.com and add an NS record named portal.
  3. Navigate to tutorialsdojo.com and add a CNAME record named portal.
  4. Navigate to tutorialsdojo.com and add a TXT record named portal.

Correct Answer: 2

Azure DNS is a hosting service for DNS domains that provides name resolution by using Microsoft Azure infrastructure. By hosting your domains in Azure, you can manage your DNS records by using the same credentials, APIs, tools, and billing as your other Azure services.

You can use the Azure portal to delegate a DNS subdomain. For example, if you own the tutorialsdojo.com domain, you can delegate a subdomain called portal to another, separate zone that you can administer separately from the tutorialsdojo.com zone.

To delegate an Azure DNS subdomain, you must first delegate your public domain to Azure DNS. Once your domain is delegated to your Azure DNS zone, you can delegate your subdomain.

You can delegate a subdomain by doing the following:

1. Create a new Azure DNS zone named portal.tutorialsdojo.com. Copy down the four nameservers as you will need them for step 2.

2. Navigate to the tutorialsdojo.com DNS zone and add an NS record named portal. Under records, enter the four nameservers from portal.tutorialsdojo.com and click ok.

3. To verify your work, open a PowerShell window and type nslookup portal.tutorialsdojo.com

Hence, this statement is correct: Navigate to tutorialsdojo.com and add an NS record named portal.

The following statements are incorrect because PTR, CNAME, and TXT records are not used to delegate an Azure DNS subdomain.

– Navigate to tutorialsdojo.com and add a PTR record named portal.

– Navigate to tutorialsdojo.com and add a CNAME record named portal.

– Navigate to tutorialsdojo.com and add a TXT record named portal.

References:
https://docs.microsoft.com/en-us/azure/dns/dns-overview
https://docs.microsoft.com/en-us/azure/dns/delegate-subdomain

Note: This question was extracted from our AZ-104 Microsoft Azure Administrator Practice Exams.

For more Azure practice exam questions with detailed explanations, check out the Tutorials Dojo Portal:

Microsoft Azure Practice Exams Tutorials Dojo

Sources:
https://azure.microsoft.com/en-us/services/dns/
https://docs.microsoft.com/en-us/azure/dns/dns-overview

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