Short Answer 
Subnets in a virtual network, such as VirtualNet4 with SubnetA, SubnetB, and SubnetC, help in organizing resources for better management and security. Each subnet can host specific resources, with SubnetA linked to a storage account and SubnetB to a container instance, while SubnetC remains unallocated. It’s important to plan network architecture when deploying Azure container instances to ensure effective resource connections and communication.
Understand Subnets in Virtual Networks
Subnets are divisions of a virtual network that allow you to segment resources for better management and security. In this scenario, there are three subnets named SubnetA, SubnetB, and SubnetC, all part of a virtual network called VirtualNet4. This segmentation enables efficient organization of resources and traffic management.
Connection of Resources to Subnets
Each subnet can be associated with specific resources. For example, SubnetA is linked to a storage account named storage123, while SubnetB is connected to a container instance known as AppContainer. SubnetC, however, is currently not connected to any resources, making it available for future deployment or resource allocation.
Deployment of Azure Container Instances
You can deploy an Azure container instance, named container5, to any of the three subnets without restrictions. When deploying, it’s crucial to plan your network architecture to ensure that resources are effectively connected and can communicate properly. This planning minimizes potential issues and optimizes resource interactions.