Azure VPN Gateway for establishing secure site-to-site VPN connections over the public internet, suitable for scenarios with moderate bandwidth requirements and where cost is a significant factor.

Azure ExpressRoute for providing dedicated private network connectivity with guaranteed high bandwidth and low latency, ideal for enterprises requiring secure, reliable, and compliant connections across multiple regions.

Azure Virtual Network Peering for enabling direct connectivity between Azure virtual networks within the same region, offering low latency and high bandwidth but not suitable for on-premises connectivity.

Azure DNS for managing and optimizing domain name resolution, which does not address the need for secure, private network connectivity between Azure and on-premises data centers.

A combination of Azure ExpressRoute for primary connectivity and Azure VPN Gateway as a failover option to ensure high availability and disaster recovery, meeting the company's requirements for reliability, performance, and compliance.