What is the primary purpose of the Network Layer in the OSI model?

The primary purpose of the Network Layer in the OSI model is focused on routing and forwarding data packets. This layer is responsible for determining the best path for data to travel across a network from the source to the destination. It handle tasks such as logical addressing, which uses IP addresses, and packet forwarding, which directs packets through the network based on these addresses.

The Network Layer ensures that data packets are delivered not just to the correct device but also through the most efficient route possible, taking into account factors such as network topology and traffic conditions. It plays a critical role in establishing paths across heterogeneous networks, meaning it must operate effectively regardless of the types of physical networks involved.

In contrast, data encryption relates more to security, which is typically the responsibility of higher layers, while error detection and correction belong to the Data Link Layer that works to ensure reliable transmission over a physical link. Session management is handled by the Session Layer, which focuses on managing and controlling conversations between applications. Thus, routing and forwarding data packets distinctly stands out as the core function of the Network Layer.