Which setting should you modify for VNET4 before you can deploy Pool4?
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Correct answer: DNS servers.
Why this is the answer
The correct answer is DNS servers. Azure Virtual Desktop (AVD) session hosts must be able to resolve Active Directory (AD) domain names to join the domain and function correctly. If VNET4's DNS servers are not configured to point to the domain controllers (or DNS servers that can resolve AD records), the AVD hosts in Pool4 will fail to join the domain. Service endpoints are used for secure access to Azure services, not for domain join. Address space defines the IP range of the VNET; while it needs to be sufficient, it doesn't directly prevent domain join if the VNET is already created. Access control (IAM) manages permissions to Azure resources, not network resolution. Peerings connect VNETs, which might be necessary for connectivity to domain controllers in another VNET, but the immediate issue for domain join within a VNET is DNS resolution.
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