What Azure Firewall feature is recommended to minimize administrative effort when implementing network access controls for session hosts?

In the context of minimizing administrative effort when implementing network access controls for session hosts in Azure, an application rule is the recommended feature. Application rules in Azure Firewall allow for simplified management of access controls by enabling you to define rules based on the fully qualified domain names (FQDNs) or specific applications rather than managing access at the network packet level. This results in less complexity because administrators do not need to track and manage individual IP addresses or ports; they can focus instead on allowable applications or services.

By using application rules, organizations can more easily manage and update their access controls as application requirements evolve, reducing the overall administrative burden. This is particularly beneficial in dynamic environments where session hosts may frequently change or scale, allowing for a more agile response to new business needs without having to frequently adjust firewall settings.

While other types of rules such as network rules, NAT rules, and infrastructure rules do serve specific purposes, they tend to require more detailed management of IP addressing and port configurations which can increase administrative overhead. Hence, leveraging application rules streamlines the management process while ensuring necessary network security for session hosts.