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Learning Path: Azure Fundamentals: Describe Azure architecture and services
What is the difference between ExpressRoute and ExpressRoute Global Reach?
ExpressRoute and ExpressRouteGlobal Reach are slightly different things which causes some confusion. You can access Azure resources from anywhere in the world however ExpressRoute provides a high-speed connection to Azure. ExpressRoute Global Reach not only provides a high-speed connection to Azure, but also other networks like a data center or a corporate network. The diagram in the ExpressRoute Global Reach documentation makes this clearer.
In our example here, a company has an office in San Francisco and London, as well as Azure services deployed to US West and UK South.
Using ExpressRoute the San Francisco and London offices can both use high-speed connectivity to reach Azure services in either location. The San Francisco office has a speed connection to Azure services in UK South, for example, but not the London office.
Using ExpressRoute Global Reach, both offices can use high-speed connectivity to connect to Azure services as well as other on-premises networks. The San Francisco office would have a high-speed connection to Azure services as well as a high-speed connection to the London office.