Final answer:
To isolate Azure services for communication with only virtual networks, implement Network Security Groups, service endpoints, and utilize Application Gateway or Azure Firewall to filter and control traffic access.
Step-by-step explanation:
To isolate Azure services and allow communication only from virtual networks, you can employ several strategies. One effective method is to use Network Security Groups (NSGs), which act as firewalls at the networking level, setting rules for inbound and outbound traffic of network interfaces, VMs, and subnets. You would set rules that deny all inbound traffic except from the specified virtual networks.
Another method is to use service endpoints. Service endpoints provide secure and direct connectivity to Azure services over the Azure backbone network. By enabling service endpoints on your virtual network, you can restrict access to your Azure service instances so that only traffic from your virtual network can reach them.
Additionally, deploying Application Gateway or Azure Firewall to filter traffic can bolster security. These options provide greater granularity in defining and enforcing network traffic rules, ensuring that only authorized traffic from your virtual networks can interact with your services. Remember to consistently monitor and audit your security rules to maintain stringent access controls.