Which OSI Reference layer provides logical IP addressing for all devices communicating over a network?

The Network Layer, which is Layer 3 of the OSI model, is responsible for logical IP addressing, enabling devices to communicate across diverse networks. It manages how data packets are routed from the source to the destination by determining the best path through the network. This layer also handles packet forwarding through routers, making it essential for establishing connections between different networks.

Logical IP addressing allows each device in the network to be uniquely identified, facilitating correct data transmission regardless of physical network differences. By encapsulating data into packets and attaching IP addresses, the Network Layer ensures that data reaches the appropriate destination, supporting various networking protocols such as IP (Internet Protocol).

Other layers, such as the Application Layer, Data Link Layer, and Transport Layer, serve different functions. The Application Layer interacts with end-user applications, the Data Link Layer is concerned with node-to-node data transfer and physical addressing, and the Transport Layer is responsible for end-to-end communication and error recovery. Each layer has its unique role, but it is the Network Layer that provides essential logical IP addressing for devices within a network.