Azure Virtual Network Peering, as it allows for seamless connectivity between virtual networks across different Azure regions without the need for public internet, ensuring low latency and high bandwidth.

Azure VPN Gateway, which provides secure site-to-site connectivity over the public internet, but may introduce higher latency and requires more complex management for multiple connections.

Azure ExpressRoute, offering dedicated private network connectivity with higher reliability and lower latency, but at a higher cost and with more complex setup requirements.

Azure DNS, which is not suitable for this scenario as it is designed for managing domain name resolution and does not provide network connectivity between virtual networks.