What must be included in requests to the Restricted Google APIs IP range from an on-prem network?

Accessing Restricted Google APIs from an on-premises network necessitates that requests include appropriate DNS resolution. When working with APIs, particularly those in a cloud environment like Google Cloud, the ability to resolve the API's domain name to an IP address is crucial. This ensures that requests are directed to the correct endpoint, allowing for successful communication with the API.

The process of DNS resolution involves translating the human-readable domain names of the APIs into machine-readable IP addresses, which is essential for any network interaction. If DNS resolution does not work correctly, the requests will fail to reach their intended destination.

In this context, while static routes, dynamic firewall rules, and public IP configuration all play roles in networking, they do not specifically pertain to the requirement for resolving the API endpoints correctly. Static routes define network paths, dynamic firewall rules control traffic based on specific conditions, and public IP configuration concerns the addressing for external network interfaces. However, none of these directly satisfy the fundamental need for DNS resolution in accessing the APIs, which makes it the essential component in this scenario.