When studying connectivity between Azure and on-premise environments, there are two main solutions that you want to focus on, VPNs and ExpressRoutes.
With the VPN, the setup uses a virtual private gateway to send encrypted traffic between your Azure and on-premise environments. Make sure you understand the different types of connections for your exam. Those would be site-to-site and point-to-site. Site-to-site is for when you’re connecting entire networks, and point-to-site is when you’re doing individual connections.
Then move on to ExpressRoute and ExpressRoute Direct. Keep in mind that these offer private, dedicated connections through third-party providers, bypassing the Microsoft public Internet.
Key things that you’ll want to remember here, Microsoft Edge routers, gateway subnets, and different types of peering that are available as part of this. Understand the different use cases and benefits to using a VPN versus using the ExpressRoute for scenario-based questions.