You have an Azure subscription that contains two virtual machines as shown in the following table. You perform a reverse DNS lookup for 10.0.0.4 from VM2. Which FQDN will be returned?
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chatgpt:
Answer: D. vm1.internal.cloudapp.net
When performing a reverse DNS lookup in Azure for a private IP address assigned to a virtual machine, the Fully Qualified Domain Name (FQDN) follows the format *.internal.cloudapp.net. This naming convention is used for private IP addresses within a virtual network in Azure.
Thus, the FQDN returned for VM1 with the IP address 10.0.0.4 would be vm1.internal.cloudapp.net.
The correct answer is D. vm1.internal.cloudapp.net.
When performing a reverse DNS lookup in Azure, the default FQDN for a virtual machine is typically in the format vmname.internal.cloudapp.net1. In this case, the IP address 10.0.0.4 corresponds to VM1, so the FQDN returned would be vm1.internal.cloudapp.net.
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Answer is D tested in Lab
nslookup -type=ptr 10.0.0.4
Server: UnKnown
Address: 168.63.129.16
Non-authoritative answer:
4.0.0.10.in-addr.arpa name = vm1.internal.cloudapp.net
Answer is D:
https://learn.microsoft.com/en-us/azure/virtual-network/virtual-networks-name-resolution-for-vms-and-role-instances#reverse-dns-considerations
D for Sure..
Reverse DNS is supported in all ARM based virtual networks. You can issue reverse DNS queries (PTR queries) to map IP addresses of virtual machines to FQDNs of virtual machines.
All PTR queries for IP addresses of virtual machines will return FQDNs of form [vmname].internal.cloudapp.net
Forward lookup on FQDNs of form [vmname].internal.cloudapp.net will resolve to IP address assigned to the virtual machine.
If the virtual network is linked to an Azure DNS private zones as a registration virtual network, the reverse DNS queries will return two records. One record will be of the form [vmname].[privatednszonename] and the other will be of the form [vmname].internal.cloudapp.net
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