What are the three most important network- layer functions in a virtual circuit network?

In a virtual circuit network, the three most important network-layer functions are connection establishment, data transfer, and connection termination. Connection establishment involves setting up a predefined path through the network before data transmission begins, ensuring all necessary resources are allocated. During data transfer, packets are sent along the established path with a consistent order, allowing for reliable communication. Finally, connection termination gracefully frees up resources and informs all involved parties that the communication session has ended.