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2.2.1. Azure DNS Fundamentals

Azure DNS hosts your DNS zones on Azure's global infrastructure. It provides both public and private DNS hosting.

Public DNS Zones:
  • Host your internet-facing domain names (e.g., contoso.com)
  • Authoritative DNS hosting (Azure answers queries for your zones)
  • Global anycast network (low latency worldwide)
  • Support for all standard record types: A, AAAA, CNAME, MX, TXT, SRV, NS, SOA
VNet DNS Settings:

Each VNet can specify DNS servers:

SettingBehavior
Default (Azure-provided)168.63.129.16 – resolves Azure names and forwards to internet
Custom DNS serversForward all queries to your DNS servers
Azure DNS Private ResolverAdvanced hybrid scenarios

⚠️ Exam Trap: Changing VNet DNS settings requires VMs to release and renew their DHCP lease (reboot or ipconfig /renew).

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Alvin Varughese
Written byAlvin Varughese
Founder•20 professional certifications