A DNS zone is used to host the DNS records for a particular domain. To start hosting your domain in Azure DNS, you need to create a DNS zone for that domain name. Each DNS record for your domain is then created inside this DNS zone. To publish a private DNS zone to your virtual network, you specify the list of virtual networks that are allowed to resolve records within the zone. These are called linked virtual networks. When auto registration is enabled, Azure DNS also updates the zone records whenever a virtual machine is created, changes its’ IP address, or is deleted.
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