What is the primary function of the Network layer in the OSI model?

The primary function of the Network layer in the OSI model is to route packets across different networks. This layer is responsible for determining the best path for data to travel from the source to the destination, making necessary decisions about how packets are forwarded and routed through various networking devices, such as routers. The Network layer also handles addressing through logical addressing schemes like IP (Internet Protocol), which uniquely identifies devices on a network.

This layer plays a crucial role in inter-network communication (communication between different networks) by managing network traffic, congestion, and ensuring that data can flow efficiently from one point to another, regardless of the underlying physical network technologies. By enabling devices on different networks to communicate, the Network layer fulfills its essential role in the OSI model.