From VM2 you perform a reverse DNS lookup for IP address 10.0.0.4. Which fully qualified domain name will the lookup return?
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Correct answer: vm1.internal.cloudapp.net.
Why this is the answer
The correct answer is vm1.internal.cloudapp.net. Azure automatically assigns internal DNS names to VMs within a virtual network. These names follow the format [VMName].internal.cloudapp.net. Since VM1 has the private IP address 10.0.0.4, a reverse DNS lookup for this IP from another VM within the same virtual network will resolve to its internal FQDN. vm1.core.windows.net and vm1.azure.com are not standard internal FQDN formats for Azure VMs. vm1.westeurope.cloudapp.azure.com is a format typically used for public DNS names associated with public IP addresses, often for cloud services or public-facing applications, not for internal private IP addresses.
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