Administering Windows Server Hybrid Core Infrastructure (AZ-800) Practice

The simplest way for Azure VMs to communicate with one another is by connecting the network interfaces of each VM to the same Virtual Network (VNet). When VMs are situated within the same VNet, they can communicate seamlessly without the need for additional configuration such as gateways or routing protocols. This direct communication takes advantage of Azure's internal networking capabilities, which are designed for efficiency and ease of management.

When VMs are part of the same VNet, they can utilize private IP addressing, allowing them to communicate with each other using their private IPs. Additionally, any services or applications hosted on these VMs can easily discover and interact with one another, streamlining workflows and improving performance.

Choosing a different VNet complicates communication, as it requires setting up VNet peering or VPNs, which can introduce latency and additional costs. Configuring a subnet extension is not the basic method for VM communication and is more about expanding network address space. ExpressRoute is a private connection to Azure that is typically used for hybrid connectivity with on-premises data centers, and isn't necessary for direct VM-to-VM communication within Azure itself.

In summary, utilizing the same VNet allows for optimal, straightforward communication between Azure VMs, leveraging the native design