Final answer:
Transferring data from Azure to an on-premises network over a VPN typically incurs additional costs known as data egress fees.
Step-by-step explanation:
The question of whether transferring several GB of data from Azure to an on-premises network over a VPN incurs additional data transfer costs can be answered as follows: True. When data is transferred out of Azure to an on-premises location, Microsoft typically charges for the outbound data transfer. This is often referred to as data egress fees in cloud computing. However, data transfer within the same Azure region or inbound to Azure is usually free. It's important to check Azure's pricing details as these can vary based on region and specific services used.