Final answer:
Azure Firewall is the service that provides network traffic filtering across multiple Azure subscriptions and virtual networks.
Step-by-step explanation:
The service that provides network traffic filtering across multiple Azure subscriptions and virtual networks is Azure Firewall.
Azure Firewall is a cloud-based network security service provided by Microsoft Azure. It allows you to centrally enforce and log application and network connectivity policies across multiple subscriptions and virtual networks.
With Azure Firewall, you can create and enforce rules to filter network traffic based on IP addresses, protocols, ports, and application patterns, providing secure and controlled access to your Azure resources.