MDFT Pro, a well-known training agency, operates a comprehensive Azure networking training environment across multiple virtual networks for their Azure networking certification program. Mark, the Network Infrastructure Designer, has deployed virtual machines across three separate virtual networks to demonstrate network segmentation and DNS resolution concepts.
The current network topology includes:
| Virtual Machine | IP Address | Virtual Network | Subnet |
|---|---|---|---|
| VM1 | 10.1.0.4 | VNET1 | Subnet1 |
| VM2 | 10.1.10.4 | VNET1 | Subnet2 |
| VM3 | 172.16.0.4 | VNET2 | SubnetA |
| VM4 | 10.2.0.8 | VNET3 | SubnetB |
Claire, the DNS Infrastructure Coordinator, has installed a custom DNS service on VM1 and configured each virtual network to use VM1 as the primary DNS server. However, VM3 and VM4 cannot resolve DNS names using the service on VM1, while VM2 works correctly.
What should Mark configure to ensure that all virtual machines can resolve DNS names using the DNS service on VM1?
Choose the correct answer from the options below.
Explanations for each answer: