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The recommendation of ExpressRoute for ensuring high availability when managing on-premises and Azure networks is well-founded. ExpressRoute is designed to provide a dedicated, private connection between on-premises infrastructure and Azure data centers, bypassing the public internet. This enhances the reliability and performance of the network, ensuring lower latency and a more stable connection for enterprise applications that require consistent uptime.

High availability in a hybrid cloud environment is critical, and ExpressRoute supports this by enabling multiple circuits and automatic failover capabilities. This means that in the event of a failure in one circuit, another can be used to maintain connectivity, which is essential for mission-critical applications.

In contrast, while the other services listed have their specific use cases and benefits, they do not solely focus on providing high availability across both on-premises and Azure environments in the same manner as ExpressRoute. Azure Site Recovery primarily focuses on disaster recovery rather than continuous availability. Azure Load Balancer distributes traffic among virtual machines but does not establish a direct line between on-premises and Azure. VPN Gateway offers secure connectivity but relies on the public internet, which may not guarantee the same level of reliability and performance as ExpressRoute.

In summary, ExpressRoute stands out as the best option for ensuring dependable high availability in